MOZ@C SULIT 4541/1 KIMIA Kertas 1 Oktober 2008 1¼ hrs 4541/1BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER SEKTOR OPERASI PENDIDIKAN KEMENTERIAN PELAJARAN MALAYSIA ______________________________________________ PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN 4 2008 KIMIA Kertas 1 Satu jam lima belas minit JANGAN BUKA KERTAS SOALAN INI HINGGA DIBERITAHU 1. 2. 3. 4. 5. 6. 7. Kertas soalan ini mengandungi 50 soalan. Jawab semua soalan Jawab dengan menghitamkan ruangan yang betul pada kertas jawapan Bagi setiap soalan hitamkan satu ruangan sahaja Sekiranya anda hendak menukar jawapan, padamkan tanda yang telah dibuat. Kemudian hitamkan jawapan yang baru. Rajah yang mengiringi soalan tidak dilukiskan mengikut skala. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan. Kertas soalan ini mengandungi 20 halaman bercetak 4541/1 1 SMS MUZAFFAR SYAH , MELAKA SULIT MOZ@C 1 Which of the following substances contain molecules? A B C D Zinc Ethanol Sodium chloride Magnesium oxide 2 Which of the following is the correct formula for barium hydroxide? A B C D BaOH Ba2OH Ba(OH)2 BaOH2 3 Which of the following set of elements consist of all non metals? A B C D Chlorine, Nitrogen and Sulphur Oxygen, Hydrogen and Lithium Phosphorus, Lead and Carbon Carbon, Iodine and calcium 4 Which of the following compounds have electrostatic forces between the particles? A B C D Ammonia Naphthalene Iodine Potassium oxide 4541/1 2 SMS MUZAFFAR SYAH , MELAKA SULIT MOZ@C 5 Which of the following is the energy change that occurs in the process of electrolysis? electrical energy heat energy potential energy chemical energy electrical energy chemical energy chemical energy electrical energy A B C D 6 The properties of acids are due to the presence of A B C D hydrogen ion hydroxide ions hydrogen atoms hydrogen molecules 7 Which of the following statements is correct? A B C D All carbonate salts are soluble in water All chloride salts are soluble in water All nitrate salts are soluble in water All sulphate salts are soluble in water 8 The National Monument is made of bronze. Which is the main metal in bronze? A B C D Aluminium Iron Tin Copper 4541/1 3 SMS MUZAFFAR SYAH , MELAKA SULIT Which diagram shows the arrangement of the helium atoms ? 10 The formula of a substance is written as FeSO4. MELAKA SULIT .MOZ@C 9 An enclosed cylinder is filled with helium atoms. What is the name of the compound according to the IUPAC system? A B C D Iron sulphate Iron(II) sulphate Iron(III) sulphate Iron(II) sulphite 11 The element which does not form compound with other elements is likely to have proton number of A B C D 4 8 10 16 4541/1 4 SMS MUZAFFAR SYAH . 17] 13 Electrolytes are able to conduct electricity because they A B C D have low melting point and boiling point contain freely moving ions contain freely moving electron contain freely moving molecules 14 Which of the following statement describes the property of hydrochloric acid? A B C D It reacts with any metal to give hydrogen It liberates ammonia from ammonium salts It causes colour of litmus paper to change from red to blue It reacts with any bases to produce a salt.MOZ@C 12 Which of the following represents the electron arrangement for sodium chloride. 11. Cl. 4541/1 5 SMS MUZAFFAR SYAH . NaCl? [Proton number. MELAKA SULIT . Na. What will be the formula of its chloride? A B C D MCl M2Cl3 MCl3 M3Cl 4541/1 6 SMS MUZAFFAR SYAH .MOZ@C 15 Insoluble salts can be prepared through A B C D Precipitation Reaction Neutralization Reaction Crystallization Recrystallization 16 Haber Process can be represented by the following equation: N2 (g) + H2 (g) → 2NH3 (g) What is the catalyst. MELAKA SULIT . temperature and pressure used in this process? Catalyst A B C D Iron Platinum Platinum Iron Temperature(˚C) 450 900 800 200 Pressure (atm) 200 150 10 1050 17 The atoms 31 15 P and 32 16 S have the same A B C D number of protons number of neutrons number of electrons nucleon number 18 The ion of a newly discovered metal M has the symbol M3+ . MOZ@C 19 The property of an element which cannot be predicted from the position of an element in the Periodic Table of Elements is A B C D the charge of its ion. Element M N TABLE 1 Which of the following is true of the compound formed between elements M and N? Proton number 3 17 Compound formula A B C D MN MN M2N3 M3N2 Type of bond Ionic bond Covalent bond Ionic bond Covalent bond 21 Which of the following voltaic cells produces the highest voltage? A B C D Iron .zinc cell Magnesium . the acidic or basic nature of its oxide.copper cell Aluminium . 20 Table 1 shows the proton number of elements M and N. the formula of its oxide the number of isotopes it has.copper cell Zinc .copper cell 4541/1 7 SMS MUZAFFAR SYAH . MELAKA SULIT . II and III only I. A B C D II and IV only I. II. O. 65. III and IV only I.MOZ@C 22 Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) Based on the equation above we can conclude that [Relative atomic mass: Zn. 32] I II III 1 mol of sulphuric acid will produce 1 mol of zinc sulphate 1 mol of zinc will react with 1 mol of sulphuric acid 100 cm3 sulphuric acid 1 mol dm-3 will produce 16.16.1 g zinc sulphate if the zinc used is in excess. MELAKA SULIT . H. S. III and IV 23 Which of the following ions would liberate a gas that turns damp red litmus paper blue when added with sodium hydroxide solution and then heated? H+ NH4+ Zn2+ Fe2+ A B C D 4541/1 8 SMS MUZAFFAR SYAH .1. IV The total volume of hydrogen gas liberated will be determined by the amount of zinc and sulphuric acid reacted. III and IV only I. III and IV 25 Which of the following diagram represents magnesium oxide? 4541/1 9 SMS MUZAFFAR SYAH . II. II and III only II.MOZ@C 24 Table 2 shows the pairs of polymer and monomer. MELAKA SULIT . Polymer I II III IV Carbohydrate Polyvinyl chloride Protein Natural rubber TABLE 2 Which of the following pairs of polymer and monomer are correct ? Monomer Glucose Chloroethene Amino acid Neoprene A B C D I and II only I. Which group is X located in the Periodic Table of Elements? A B C D 2 16 17 18 28 The electron arrangement of atoms P and Q are 2. 6. Which of the following statement is true about the formation of a compound between P and Q ? A B C D Each atom Q receives an electron from one atom P Each atom P receives four electrons from one atom Q Each atom P combines with two atoms Q by sharing of electrons Each atom P combines with one atom Q by transfer of electrons 4541/1 10 SMS MUZAFFAR SYAH .6 respectively. MELAKA SULIT .045 mol of bromine? [Avogadro Constant .9 X 1024 1.4 and 2.7 X 1022 3.MOZ@C 26 How many molecules of bromine are there in 0.2 X 1025 A B C D 27 An element X requires two electrons to form a stable negative ion.3 X 1023 7.8.02 X 1023 ] 2. MOZ@C 29 Silver nitrate solution of 1 mol dm-3 is electrolysed by using silver electrodes. CuO + 2HNO3 → Cu(NO3)2 + H2O Calculate the mass of copper(II) nitrate formed when 6.64.ions. N.04g 4541/1 11 SMS MUZAFFAR SYAH .4g of copper (II) oxide powder reacts with excess nitric acid.96g 5. 31 The following equation represents the reaction between copper(II) oxide and nitric acid. one molecule of sulphuric acid contains two moles OH.52g 15. one mole of sulphuric acid can neutralise two moles of bases. O.16] A B C D 4.04g 7.14. O2 + 2H2O+ 4e 4OH. O2 + 2H2O+ 4e Ag Ag Ag+ + e Ag+ + e Cathode 2H+ + 2e H2 Ag+ + e Ag Ag+ + e Ag 2H+ + 2e H2 30 Sulphuric acid is a diprotic acid because A B C D sulphuric acid has the properties of acid and also a dehydrating agent. Which of the following half equations occur at the anode and cathode respectively? Anode A B C D 4OH. [ Relative atomic mass: Cu. one molecule of sulphuric acid produces two H+ ions in water. MELAKA SULIT . Te. X is located in Group 17 of the Periodic Table. Atom P Atom Q DIAGRAM 1 Which of the following represents metals P and Q? P A B C D Copper Tin Zinc Zinc Q Zinc Copper Carbon Copper 7 3 33 An element represented by the symbol A B C D has three valence electrons forms a positively charged ion. MELAKA SULIT . has 3 protons and 7 neutrons. 34 8 atoms of element Z have the same mass as in 1 atom of tellurium. what is the relative atomic mass of element Z? [Relative atomic mass : Te. Based on the statement above. 128 ] A B C D 8 16 32 64 4541/1 12 SMS MUZAFFAR SYAH .MOZ@C 32 Diagram 1 below shows the atom arrangement in brass that is represented by atom P and atom Q. MOZ@C 35. Z Z DIAGRAM 2 Which of the following statements is true about molecule Z2? A B C D Exists as solid at room temperature. Has a low melting point. 4541/1 13 SMS MUZAFFAR SYAH . MELAKA SULIT . Dissolves in water. Which of the following locations are correct of an element with a proton number of 7 in the Periodic Table of Elements? I II Period 2 Period 5 III Group 15 IV Group 2 A B C D I and III only II and IV only I and IV only II and III only 36 Diagram 2 shows the electron arrangement in a molecule formed between two Z atoms. Conducts electricity in molten state. What is substance X? A B C D Lead (II) chloride Lead (II) bromide Copper (II) bromide Copper (II) chloride 38 Which of the following solutions has the lowest pH value? 0. After 10 minutes. calculate the volume of hydrogen gas released at room conditions when 1.3 g of zinc powder reacts with excess hydrochloric acid.MOZ@C 37 Substance X in the molten form is electrolysed using carbon electrodes. NH4OH 1. NaOH 2HCl → ZnCl2 A B C D 39 Zn + + H2 Based on the equation above. 35. MELAKA SULIT . CH3COOH 1. Cl.5. Zn. a brown solid is deposited at the cathode and a greenish yellow gas is released at the anode.1 mol dm-3 sulphuric acid.0 mol dm-3 aqueous ammonia. Relative atomic mass: H.1.0 mol dm-3 sodium hydroxide solution.1 mol dm-3 ethanoic acid. [ Molar volume : 24 dm3mol-1 at room conditions. 65] 120 cm3 240 cm3 360 cm3 480 cm3 A B C D 4541/1 14 SMS MUZAFFAR SYAH . H2SO4 0. Which of the following equations represents the reaction that requires the use of vanadium(V)oxide as catalyst? S + O2 → SO2 2SO2 + O2 → 2SO3 SO3 + H2SO4 → H2S2O7 H2S2O7 + H2O → 2H2SO4 A B C D 41 Which of the following graphs shows the temperature (T) against time (t) when a mixture of pentane (boiling point 36oC) and hexane (boiling point 70oC) is distilled? 42 A hydrocarbon has the empirical formula of CH3 with a molar mass of 30 g mol-1. 1. C.MOZ@C 40 The manufacturing of sulphuric acid involves several reactions.12 ] A B C D CH3 C2H6 C3H9 C4H12 4541/1 15 SMS MUZAFFAR SYAH . Which of the following is the molecular formula of the hydrocarbon? [Relative atomic mass : H. MELAKA SULIT . III and IV Type of Bond Covalent Covalent Ionic Covalent A B C D 4541/1 16 SMS MUZAFFAR SYAH . III and IV only I. Y and Z. II.MOZ@C 43 Element X reacts with cold water to form alkaline solution while element Y reacts with water to form acidic solution. Element Proton Number X 12 TABLE 3 What is the formula of the substance and the type of bond formed between X. MELAKA SULIT . Which of the following is the correct group of X and Y in the Periodic Table of Elements? X A B C D 1 2 1 3 Y 14 15 17 17 44 Table 3 shows the proton number of three elements X. Y and Z? Y 8 Z 17 Formula I II III IV XY YZ2 XZ2 Z2 IV only III and IV only II. Zinc plate Iron plate Iron (II) sulphate solution DIAGRAM 3 Which of the following statements will increase the reading of the voltmeter? I II III IV Increase the volume of iron (II) sulphate solution Substitute the iron plate with a silver plate Use a more dilute iron (II) sulphate solution Substitute the zinc plate with a magnesium plate A B C D I and II only I and III only II and IV only II.MOZ@C 45 Diagram 3 shows the set up of the apparatus of a simple voltaic cell. III and IV only 4541/1 17 SMS MUZAFFAR SYAH . The reading on the voltmeter is 0. MELAKA SULIT .3 V. III and IV 4541/1 18 SMS MUZAFFAR SYAH .5 cm3 25.2 mol dm-3 needed to completely neutralise 50 cm3 calcium hydroxide solution 0. a white precipitate which is soluble in excess is formed.0 cm3 37. II.5 cm3 50.05 mol dm-3. II. MELAKA SULIT . 12.MOZ@C 46 Neutralization reaction between nitric acid and calcium hydroxide is shown in the chemical equation below. The ions that could be present in the solution are Al3+ Zn2+ I II III Mg2+ IV Pb2+ A B C D I and II only III and IV only I.0 cm3 A B C D 47 When sodium hydroxide is added dropwise until in excess to a solution. 2HNO3 + Ca(OH)2 → Ca(NO3)2 + 2H2O What is the minimum volume of nitric acid of 0. and IV only I. III and IV only 49 Elements P. Q.MOZ@C 48 Which of the following properties of ceramics are correctly matched to the ceramic articles? Ceramic articles I II III IV Tiles Spark plug Superconductor Electrical cable holder Properties of ceramic Resistant to chemical reactions High melting point Low electrical resistance Good conductor of electricity A B C D I and II only II and III only I. Table 4 shows the observation for the reaction of the elements with chlorine and the formula of the chloride formed. R are earth metals B The atomic radius increases from P to Q to R C The elements form ion with univalent negative charge D Their reactivity decreases down the group 4541/1 19 SMS MUZAFFAR SYAH . MELAKA SULIT . II and III only II. Reaction with chlorine P Q R Burns brightly Burns very brightly Burns most brightly TABLE 4 Formula of chloride PCl QCl RCl Which of the following statements is correct? A P. Q and R are in the same group in the Periodic Table of Elements. MELAKA SULIT .MOZ@C 50 Diagram 4 below shows the set up of the apparatus for the electrolysis of concentrated sodium chloride solution. DIAGRAM 4 Which of the following formulas shows the products formed at the anode and the cathode respectively? Anode A B C D O2 Cl2 Cl2 O2 Cathode H2 H2 Na Cl2 END OF QUESTION PAPER 4541/1 20 SMS MUZAFFAR SYAH . Anda diminta menjawab dengan lebih terperinci untuk Bahagian B dan Bahagian C...... 3..............MOZ@C Nama: . Jawab semua soalan daripada Bahagian A..... SULIT 4541/2 Kimia Kertas 2 Oktober 2008 2 ½ jam BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH / KLUSTER SEKTOR OPERASI PENDIDIKAN KEMENTERIAN PELAJARAN MALAYSIA PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN 4 2008 KIMIA Kertas 2 Dua jam tiga puluh minit JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU 1...... jadual. Bahagian Soalan Markah penuh Markah diperoleh A B C 1 2 3 4 5 6 7 8 9 10 10 10 10 10 10 10 20 20 20 20 Jumlah Kertas soalan ini mengandungi 16 halaman bercetak [lihat sebelah SULIT SMS MUZAFFAR SYAH ..Jawapan kepada bahagian B dan Bahagian C hendaklah ditulis pada kertas tulis.... Anda hendaklah menyerahkan kertas tulis dan kertas tambahan........ 4. Tuliskan jawapan anda dalam ruang yang disediakan Jawab satu soalan daripada Bahagian B dan satu soalan daripada Bahagian C........ Persamaan. 5.. Jawapan mestilah jelas dan logik. Tuliskan nama dan tingkatan pada ruang yang disediakan............ jika digunakan bersama-sama dengan kertas soalan.... Penggunaan kalkulator saintifik yang tidak boleh diprogramkan adalah dibenarkan... gambar rajah... 2..... MELAKA ..... 6....... Tingkatan: .. graf dan cara lain yang sesuai untuk menjelaskan jawapan anda boleh digunakan.. 2 (i) State one observation in the gas jar after a few minutes. [1 mark] (ii) Name the process that occurred in the gas jar.2 shows the set up of the apparatus of an experiment where a drop of bromine liquid is dropped into a gas jar and is left for a few minutes.. …………………………………………………………………………………………………. bromine gas DIAGRAM 1.1 shows the symbols for atoms of elements X. [1mark] 4541/2 2 SMS MUZAFFAR SYAH . Y and Z. ……………………………………………………………………………………………… [1 mark] (ii) What is the number of neutrons for atom Y? ……………………………………………………………………………………………… [1 mark] (iii) What is the atomic mass of atom X? ……………………………………………………………………………………………… [1 mark] (b) Diagram 1. MELAKA [Lihat sebelah] SULIT .SULIT 1. ……………………………………………………………………………………………………. 4541/2 24 28 19 X 12 14 Y 9 DIAGRAM 1. MOZ@C Diagram 1.1 Z (a) (i) Write the electron arrangement of atom Z. Draw the particles arrangement of substance X at 60oC and at 80oC. [1 mark] (v) The change of state in (b) (iv) can occur at room temperature. Explain why …………………………………………………………………………………………………. …………………………………………………………………………………………………. 4541/2 …………………………………………………………………………………………………. At 60oC At 80oC [2 marks] 4541/2 3 SMS MUZAFFAR SYAH .SULIT (iii) MOZ@C Name the type of particles that exist in bromine. MELAKA [Lihat sebelah] SULIT . [1 mark] (iv) State the change of state of bromine that occurred in the gas jar.. [1 mark] (c) Substance X has a melting point of 79oC .. ... [2 marks] (c) State one precautionary step to be taken when carrying out the experiment above... Description Combustion tube + asbestos paper Combustion tube + asbestos paper + copper oxide Combustion tube + asbestos paper + copper Mass (g) 36..40 38....20 39. [1 mark] 4541/2 4 SMS MUZAFFAR SYAH .76 TABLE 2 (a) What is meant by ‘empirical formula’ ? ……………………………………………………………………………………………… ……………………………………………………………………………………………… [1 mark] (b) Draw a labelled diagram to show the set up of the apparatus that can be used to carry out the experiment above. Table 2 shows the results obtained.. MELAKA [Lihat sebelah] SULIT . An experiment was carried out in the school laboratory to determine the empirical formula of an oxide of copper by flowing hydrogen gas over heated copper oxide. ……………………………………………………………………………………....SULIT MOZ@C 4541/2 2.. ……………………………………………………………………………………………… [1 mark] (f) Can the empirical formula of magnesium oxide be determined through the experiment above? Give one reason for your answer. O. 64.SULIT (d) Based on the results obtained. [Relative atomic mass: Cu. (i) MOZ@C 4541/2 calculate the mass of copper and oxygen that have reacted. 16] [1 mark] (iii) determine the empirical formula of the copper oxide [1 mark] (e) Write a balanced chemical equation for the reaction between copper oxide and hydrogen. ……………………………………………………………………………………………… ……………………………………………………………………………………………… [2 marks] 4541/2 5 SMS MUZAFFAR SYAH . MELAKA [Lihat sebelah] SULIT . [1 mark] (ii) determine the ratio of moles of copper atom to oxygen atom. …………………………………………………………………………………… [1 mark] (ii) Which element forms an amphoteric oxide? …………………………………………………………………………………… [1 mark] Which element is a halogen? ……………………………………………………………………………………. answer the following questions. (i) Choose an element that is monoatomic. [1 mark] (iii) (b) Write the formula for the ion formed from an atom of element P. P Q R S T U V W DIAGRAM 3 (a) Using the letters in Diagram 3. MOZ@C 4541/2 Diagram 3 shows the position of several elements in the Periodic Table of Elements. ……………………………………………………………………………………………… [1 mark] (c) Which element has the biggest atomic radius? ……………………………………………………………………………………………… [1 mark] (d) (i) Why are elements Q and R placed in the same group? ……………………………………………………………………………………………… [1 mark] 4541/2 6 SMS MUZAFFAR SYAH ..SULIT 3. The letters do not represent the actual symbols of the elements. MELAKA [Lihat sebelah] SULIT . .……………………………………………………………………………………. ……………………………………………………………………………………………… [1 mark] 4541/2 7 SMS MUZAFFAR SYAH . ……….SULIT (ii) MOZ@C 4541/2 When a small piece of element Q is put into water. MELAKA [Lihat sebelah] SULIT . U. a type of solution is formed. Name the type of solution formed. ……………………………………………………………………………………………… [1 mark] (f) State one special characteristic of element S. ……………………………………………………………………………………………… [1 mark] (iii) Compare the reactivity of the reaction towards water between elements Q and R. V and T according to the increase in size of atoms. [1 mark] (e) Arrange P. ………....... [1 mark] (c) (i) State the observation at electrode T . MELAKA [Lihat sebelah] SULIT .. ………..... U T copper(II) sulphate solution DIAGRAM 4 (a) State which electrode acts as the anode. [1 mark] (b) Name all the ions present in the solution... ……….……………………………………………………………………………………......... [1 mark] (ii) Write the half equation for the reaction at electrode T...... ……………………………………………………………………………………..... ………………………………………………………………………………………. Diagram 4 shows the set up of the apparatus for the electrolysis of copper(II) sulphate solution using copper as electrodes... [1 mark] (d) (i) State the colour change (if any) to the copper (II) sulphate solution.. [1 mark] 4541/2 8 SMS MUZAFFAR SYAH .………………………………………………………………………………..SULIT MOZ@C 4541/2 4....……………………………………………………………………………………... …………………………………………………………………………………………….. [2 marks] (f) The above experiment is repeated by using carbon electrodes to replace the copper electrodes.…………………………………………………………………………………… ……….……………………………………………………………………………………….………………………………………………………………………………………... ……. [2 marks] 4541/2 9 SMS MUZAFFAR SYAH . (i) Name the product formed at electrode U. …….SULIT (ii) MOZ@C Explain your answer in (d)(i) 4541/2 ………...………………………………………………………………………………………. MELAKA [Lihat sebelah] SULIT .…………………………………………………………………………………… ……………………………………………………………………………………………. [1 mark] (ii) Describe how you could verify the product formed in f(i) ……. 4541/2 10 SMS MUZAFFAR SYAH . ………………………………………………………………………………………………… [1 mark] (d) Calculate the concentration of the potassium hydroxide solution in mol dm-3.SULIT MOZ@C 4541/2 5. Final burrett reading/cm3 Initial burrette reading/cm3 Volume of acid/cm3 [2 marks] (b) State the change of colour to the phenolphtalein indicator in the titration.0 cm3 of potassium hydroxide solution and 1. ………………………………………………………………………………………………… [1 mark] (c) Write the chemical equation for the neutralisation reaction. 0 25 1 26 Initial titration Potassium hydroxide solution DIAGRAM 5 Final titration (a) Complete the table below. MELAKA [Lihat sebelah] SULIT .0 mol dm-3 of hydrochloric acid using phenolphtalein as indicator. Diagram 5 shows the set up of the apparatus and the magnification of the burette reading for the titration of 25. . ……………………………………………………………………………………………. Sulphur + O2 Heat Sulphur dioxide + O2 Step X Sulphur trioxide Step Y + H2SO4 Sulphuric acid DIAGRAM 6 Oleum (i) Name the process of manufacturing sulphuric acid. …………………………………………………………………………………………………. MELAKA [Lihat sebelah] SULIT . Diagram 6 shows the flow chart for the industrial manufacture of sulphuric acid. ………………………………………………………………………………………………….SULIT MOZ@C 4541/2 (e) [3 marks] The experiment above is repeated by using 1.0 mol dm-3 of sulphuric acid to replace the hydrochloric acid to titrate the 25. State the volume of the sulphuric acid needed to titrate the potassium hydroxide solution. [1 mark] (ii) Write a balanced chemical equation for Step X and Step Y. ………………………………………………………………………………………………….. Step X: ………………………………………………………………………………………… Step Y: ………………………………………………………………………………………… [2 marks] 4541/2 11 SMS MUZAFFAR SYAH . …………………………………………………………………………………………………… [1 mark] (i) (ii) Explain your answer in (e) (i)..0 cm3 potasssium hydroxide solution. [2 marks] 6. .... [1 mark] (ii) State one use of ammonium sulphate in daily life? ……………………………………………………………………………........... (i) Name the reaction. [3 marks] (b) Sulphuric acid reacts with aqueous ammonia to form ammonium sulphate... .... ………………………………………………………………………………………………. 16......……………………………………………………….... MELAKA [Lihat sebelah] SULIT . [Relative atomic mass : H. 14.... S..... O.... (NH4)2SO4 salt...................... N..……..SULIT MOZ@C 4541/2 (iii) State the three conditions required for the reaction in Step X. [1 mark] (iii) Calculate the percentage of nitrogen in ammonium sulphate.... ……………………………………………………………………………………………….... 32 ] [2 marks] 4541/2 12 SMS MUZAFFAR SYAH ...... ………………………………………………………………………………………………..... 1. N2 CO2 H2S H2O DIAGRAM 7 (a) Calculate the molar mass of each gas shown in Diagram 7.2 g of carbon dioxide. 12. 32 ] [4 marks] (b) Show that 0. the number of molecules and the number of atoms [5 marks] (c) of the 0. 16. hydrogen sulphide gas released from the eruption of the volcano will react with oxygen in the air to produce sulphur dioxide and water vapour. O. Diagram 7 shows the formulae of 4 types of gases released during the eruption of a volcano. Avogadro Constant. Avogadro Constant. (i) (ii) write a balanced chemical equation to represent the reaction. Referring to the information above. [7 marks] 4541/2 13 SMS MUZAFFAR SYAH . C. O. 1 mol of gas occupies a volume of 24 dm3 at room temperature and pressure. 12. N. 16. S. 7.02 X 1023] [4 marks] A sample contains 0. 12.02 X 1023] Calculate: (i) (ii) (iii) (iv) the volume. calculate the maximum mass of sulphur dioxide produced if 952 g of hydrogen sulphide is released from the volcanic eruption. [Relative atomic mass : H. 1.1 mol carbon dioxide gas at room temperature and pressure. [Relative atomic mass: H. MELAKA [Lihat sebelah] SULIT . [Relative atomic mass : C. The suggested time to answer section B is 30 minutes. (d) At very high temperature.1 mol carbon dioxide gas in the sample. C.SULIT MOZ@C 4541/2 Section B ( 20 marks ) Answer any one question from this section. 1.9 g of water vapour contains the same number of molecules as in 2. O. 14.NA = 6. 16. the mass. NA = 6. MELAKA [Lihat sebelah] SULIT .7 2.1 shows the electron arrangement for atoms P.1 (a) The reaction between atoms of P and Q form an ionic compound whereas the reaction between atoms of Q and R forms a covalent compound.8. MOZ@C Table 8. Q dan R. 4541/2 Element P Q R Electron arrangement 2.8 2970 TABLE 8. Compound M N Melting Point (OC) . explain how these ionic and covalent compounds are formed. [ 8 marks] 4541/2 14 SMS MUZAFFAR SYAH . Based on the above statement. [12 marks] (b) Table 8.2 shows the melting point and boiling point of two chemical compounds at room temperature.1 2.23 2030 Boiling Point (OC) 76.4 TABLE 8.8.SULIT 8.2 Explain the differences in the melting point and boiling point of compound M and N with respect to the types of particles present and the types of bonding. [4 marks] 4541/2 15 SMS MUZAFFAR SYAH .SULIT MOZ@C Section C ( 20 marks ) Answer any one question from this section. (a) What is the meaning of electrolyte? [2 marks] (b) Lead(II) bromide powder cannot conduct electricity but molten lead(II) bromide can conduct electricity. Explain the above statement. The suggested time to answer section C is 30 minutes. Draw one example of a voltaic cell and write the half equation for the reaction that occurs at the anode and cathode. [4 marks] (c) A student has a spoon made of iron. He intends to beautify the spoon by electroplating it with a suitable metal. Design a laboratory experiment to electroplate the iron spoon. Your answer should consist of the following: Chemicals required Procedures of the experiment Diagram showing the set-up of the apparatus Half-equations involved in the reaction Observation [10 marks] (d) Electrolytic cell and voltaic cell are two types of cells. MELAKA [Lihat sebelah] SULIT . 4541/2 9. pure copper DIAGRAM 10 brass (i) (ii) (iii) What is the meaning of alloy? [1 mark] State the three aims of alloying [3 marks] Brass is harder than pure copper. 4541/2 [10 marks ] (b) Diagram 10 shows the arrangement of atoms in pure copper and brass. [6 marks] 4541/2 16 SMS MUZAFFAR SYAH .SULIT 10. Explain. MELAKA [Lihat sebelah] SULIT . (a) MOZ@C Describe an experiment to prepare a dry zinc nitrate. Your answers should include the equations involved. SULIT MOZ@C 4541/2 4541/2 17 SMS MUZAFFAR SYAH . MELAKA [Lihat sebelah] SULIT . ……… 4541/3 KIMIA Kertas 3 Oktober 2008 1½ Jam BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER SEKTOR OPERASI PENDIDIKAN KEMENTERIAN PELAJARAN MALAYSIA _______________________________________________ PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN 4 2008 KIMIA KERTAS 3 Satu jam tiga puluh minit JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU 1. 4. Untuk Kegunaan Pemeriksa Soalan 1 2 3 Jumlah Markah Penuh 15 18 17 50 Markah Diperoleh Kertas soalan ini mengandungi 10 halaman bercetak SMS MUZAFFAR SYAH . 3.MOZ@C Name :………………………………………………………… Class: …………. Tuliskan nama dan tingkatan anda pada ruangan yang disediakan. Calon dikehendaki membaca maklumat di halaman 2 kertas soalan ini. 2. Soalan dalam Bahasa Inggeris mendahului soalan yang sepadan dalam Bahasa Melayu. MELAKA . Kertas soalan ini adalah dalam dwibahasa. 5. Write your answers for Question 1 and Question 2 in the spaces provided in the question paper. Sekiranya anda hendak menukar jawapan. Kertas soalan ini mengandungi tiga soalan. Tuliskan jawapan bagi Soalan 3 pada halaman bergaris di bahagian akhir kertas soalan ini dengan terperinci. Tunjukkan kerja mengira. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan. Serahkan semua kertas jawapan anda di akhir peperiksaan. MELAKA SULIT . neatly cross out the answer you have done. diagrams. If you wish to change your answer. Jawab semua soalan. 7. Then write down the new answer. Answer all questions. 9. Markah yang diperuntukkan bagi setiap soalan atau ceraian soalan ditunjukkan dalam kurungan.SULIT MOZ@C INFORMATION FOR CANDIDATES MAKLUMAT UNTUK CALON 1. graf dan cara lain yang sesuai untuk menjelaskan jawapan anda. Diagrams in the questions are not drawn to scale unless stated. Kemudian tulis jawapan yang baru. Masa yang dicadangkan untuk menjawab Soalan 1 dan Soalan 2 ialah 45 minit dan Soalan 3 ialah 45 minit. Anda boleh menggunakan persamaan. 3. 2. Rajah yang mengiringi soalan tidak dilukis mengikut skala kecuali dinyatakan sebaliknya. Marks allocated for each question or part questions are shown in brackets. tables. You may use a non-programmable scientific calculator. 4541/3 2 SMS MUZAFFAR SYAH . batalkan jawapan yang telah dibuat. You may use equations. It may help you to get marks. 4. ini membantu anda mendapatkan markah. 8. jadual. Tuliskan jawapan bagi Soalan 1 dan Soalan 2 dalam ruang yang disediakan dalam kertas soalan. Write your answers for Question 3 on the lined pages at the end of the question paper in detail. This question paper consists of three questions. Time suggested for answering Question 1 and Question 2 is 45 minutes and Question 3 is 45 minutes. gambar rajah. 10. graphs and any other suitable methods to explain your answer. 6. Show your working. Hand in this question paper at the end of the examination. MELAKA SULIT .SULIT Marks awarded: MOZ@C Mark 3 2 1 0 Description Excellent: The best response Satisfactory : An average answer Weak : An inaccurate response No response or wrong response Pemberian Markah: Skor 3 2 1 0 Penerangan Cemerlang: Respons yang paling baik Memuaskan: Respons yang sederhana Lemah: Respons yang kurang tepat Tiada respons atau respons salah 4541/3 3 SMS MUZAFFAR SYAH . Based on Diagram 1.0 2 82. Diagram 1 shows the thermometer reading at the 4th and the 6th minute of the experiment when acetamide was heated in a boiling tube until above its melting point. [3 marks] 4541/3 4 SMS MUZAFFAR SYAH . 100 100 90 90 80 Thermometer reading at the 4th minute 80 Thermometer reading at the 6th minute DIAGRAM 1 (a) Time /min Temperature/o C 0 ½ 1 50.0 3½ 82. complete the table to show the temperature at the 4th and the 6th minute. An experiment was carried out by a group of students to determine the melting point of acetamide.SULIT For examiner’s use MOZ@C Answer all questions 1. MELAKA SULIT .0 2½ 82.0 27. [3 marks] 1(b) (b) On the graph paper provided.0 5½ 92.0 1½ 66.0 Time /min Temperature/o C 4 4½ 84.0 6 TABLE 1 1(a) Table 1 shows the results of the experiment.0 3 82.0 36.0 5 88. draw the graph of temperature against time based on the collected data. SULIT MOZ@C 4541/3 5 SMS MUZAFFAR SYAH . MELAKA SULIT . Show on the graph how you determine this melting point. Classify the following compounds into covalent compounds and ionic compounds.SULIT For examiner’s use MOZ@C (c) Use the graph in (b) . ………………………………………………………………………………… ………………………………………………………………………………… 1(c) 1(d) ………………………………………………………………………………… [3 marks] (e) Acetamide is an example of a covalent compound and sodium chloride is an example of an ionic compound. to determine the melting point of acetamide. ……………………………………………………………………………… [3 marks] (d) The temperature did not change from the 2nd minute until the 4th minute. Explain why. Magnesium chloride Tetrachloromethane Zinc sulphate Carbon dioxide Methylbenzene Copper(II) nitrate 1(e) [3 marks] 4541/3 6 SMS MUZAFFAR SYAH . MELAKA SULIT . 1 below. ALKALI METAL Lithium OBSERVATION The lithium metal moves slowly on the surface of the water.SULIT MOZ@C 2. Sodium Potassium TABLE 2. The reactivity of alkali metals with water depends on their position in Group 1 of the Periodic Table of the Elements.1 4541/3 7 SMS MUZAFFAR SYAH . The potassium metal moves the fastest on the surface of the water. sodium and potassium to react with water respectively. MELAKA SULIT . Diagram 2 below shows the set up of the apparatus for an experiment to determine the reactivity of the alkali metals with water. The sodium metals moves faster on the surface of the water with “hissing” sound. alkali metal basin filled with water DIAGRAM 2 The experiment is carried out by using lithium. Observation of the experiment is shown in Table 2. ......................................... ................................... ……………………………………………………………………………… [3 marks] 4541/3 8 SMS MUZAFFAR SYAH ................................................2 below based on the experiment..................... (iii) Fixed variable ........... ............................................ ……………………………………………………………………………………............................... (ii) What to observe in the responding variable ........................................................................................................................................................ [3 marks] 2(b) (c) 2(c) Based on Table 2............................................................................................................................................................. .................................. (ii) Responding variable ........................................................................... ........... ..................................... arrange the alkali metals in descending order of reactivity of the metals with water.. (iii) The way to maintain the fixed variable .................SULIT For examiner’s use MOZ@C (a) Complete Table 2............. 2(a) .............................................. ....... .......................... …………………………………………………………………………………….......... Name of variables (i) Manipulated variable ........................ MELAKA SULIT .................. Action to be taken (i) The way to manipulate variable ..... [6 marks] TABLE 2....................2 (b) State the hypothesis for the experiment above......... .................... ...............2.......................... ..... …………………………………………………………………………………….SULIT (d) MOZ@C The proton number of the alkali metals increase in the order: Lithium → Sodium → Potassium State the relationship between the position of the alkali metals in Group 1 and their reactivity.. ………………………………………………………………………….... ……………………………………………………………………………………. ……………………………………………………………………………… [3 marks] 2(e) 4541/3 9 SMS MUZAFFAR SYAH ........ [3 marks] For examiner’s use 2(d) (e) Rubidium is an alkali metal located below potassium in Group 1 . Predict the reactivity of rubidium with water.... MELAKA SULIT . SULIT MOZ@C 3. MELAKA SULIT . Based on the statement above. The distance of pairs of metals in the electrochemical series influenced the voltage values in different electrochemical cells. Your planning should include the following: (i) (ii) (iii) (iv) (v) (vi) Statement of the problem All the variables Hypothesis List of materials and apparatus Procedure Tabulation of data [17 marks] END OF QUESTION PAPER 4541/3 10 SMS MUZAFFAR SYAH . plan a laboratory experiment to construct an electrochemical cell to determine the factor that influences the differences in the voltage values. MELAKA . 2 dan 3 1 SMS MUZAFFAR SYAH .SULIT SULIT 4541/1 Kimia Oktober 2008 MOZ@C 4541/1/2/3 BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KLUSTER SEKTOR OPERASI PENDIDIKAN KEMENTERIAN PELAJARAN MALAYSIA PEPERIKSAAN SELARAS DIAGNOSTIK TINGKATAN EMPAT 2008 SBP KIMIA Peraturan pemarkahan Kertas 1. MELAKA .SULIT MOZ@C Paper 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 B C A D C A C D D B C D B D A A B C C A 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 D D B B C A B C C D D A B B A C D A D B 41 42 43 44 45 46 47 48 49 50 B B C C C B C C B B 2 SMS MUZAFFAR SYAH . SULIT MOZ@C Marking Scheme Paper 2 Section A No 1(a)(i) (ii) (iii) 1(b)(i) (ii) (iii) (iv) (v) 1(c) 2.7 14 24 MARKING CRITERIA MARK SUB TOTAL 1 1 1 3 1 1 1 1 1 Reddish brown gas formed Diffusion Molecules Liquid → gas Bromine has low boiling point 5 1 1 2 10 2(a) A chemical formula that gives the simplest whole number ratio of atoms of each element in the compound. 1 1 2(b) Burning excess hydrogen Oxide of copper Dry hydrogen gas Heat - functional - label( oxide of copper, dry hydrogen gas and heat) 1 1 2 3 SMS MUZAFFAR SYAH , MELAKA SULIT 2(c) MOZ@C ●Remove all the air from the apparatus before the oxide of copper is heated ●The flow of hydrogen gas is continued throughout the cooling of the product Any one answer correct 1 1 2 d(i) mass of copper : 38.76 – 36.20 = 2.56g mass of oxygen : 39.40 – 38.76 = 0.64g Calculation + mass including unit 1 2 d(ii) Cu 2.56/64 0.04 1 : O : 0.64/16 : 0.04 : 1 CuO 1 2d(iii) 1 3 2(e) CuO + H2 Cu + H2O 1 1 2(f) No. Magnesium is more reactive than hydrogen.// Magnesium is above hydrogen in the Reactivity Series. 1 1 2 10 3(a) W T V P2+ 1 1 1 1 3 1 3 (b) 3(c) R ● The atoms have the same valence electron. 1 1 3(d) ● alkaline ● R is more reactive than Q 1 1 1 3 4 SMS MUZAFFAR SYAH , MELAKA SULIT 3(e) V, U, P and T MOZ@C 1 1 3(f) Forms coloured compound/ion//can act as catalyst//has variable oxidation number 1 1 10 4(a) U 1 1 4(b) copper (II) ion, suphate ion,hydrogen ion,hydroxide ion a: symbol brown solid is deposited//electrode T becomes thicker Cu2+ + 2e Cu 1 1 4(c)(i) (ii) 1 1 1 1 1 1 1 1 2 4(d) (i) The intensity of blue colour solution remains unchanged (ii) The rate of Cu2+ ion discharged at the cathode same with the rate of Cu2+ ion formed at the anode The concentration / no.of Cu2+ ion remains unchanged 4(f)(i) (ii) oxygen gas Put a glowing wooden splinter near/into the mouth of the test tube lighted up/rekindled 3 3 10 5(a) Final burrett reading/cm3 Initial burrette reading/cm3 Volume of acid/cm3 5(b) pink to colourless HCl + KOH → KCl + H2O 25.55 0.55 25.00 1 1 2 1 1 5(c) 1 1 5(d) MaVa MbVb = 1 1 1 1 1.0 x 25.0 = 1 Mb x 25.0 1 Mb = 1.0 mol dm-3 1 3 5 SMS MUZAFFAR SYAH , MELAKA has 2 times the concentration of H+ hydrocholric acid.X 100 14(2)+1(8)+32+16(4) 1 = 28 ----.5 cm3 Sulphuric acid is a diprotic acid. MELAKA .X 100 32 = 21. 1 1 1 ions compared to 3 10 6(a)(i) (ii) (iii) (i) Contact Process 2SO2 + O2 → 2SO3 SO3 + H2SO4 → H2S2O7 Catalyst: vanadium (V) oxide Temperature: 450oC – 550oC Pressure : 1 atm 1 1 1 1 1 1 1 1 6 6(b) (i) (ii) (iii) Neutralization Fertilizer % of Nitrogen = 14X2 --------------------------.SULIT 5(e) MOZ@C 12.21% 1 4 10 6 SMS MUZAFFAR SYAH . 1 X 6.05 2 no.2 44 = 0.806 X 1023 2 H2S + 3 O2 → 2SO2 + 2H2O Correct formula of reactant and product Correct no. H2O : 2(1) + 16 = 18 7(b) 1 moles of water vapour = 0. 2 moles of H2S produced 2 moles SO2 28 moles of H2S produced 28 moles of SO2 3. Moles of H2S = 952 34 = 28 2.1 X 6.4g MARK SUB TOTAL 1 1 1 1 4 1 1 1 4 1 1 (ii) (iii) No. of atom = 3 X 0.05 moles 4 no. of molecules = 0. mass of SO2 = 28 x [ 32 + 2(16) ] = 1792 g 7 SMS MUZAFFAR SYAH .02 X 1022 = 1. MELAKA 1 1 1 1 1 1 1 5 (ii) 1 1 1 7 . of mol of reactant Correct no.02 X 1023 = 6.05 moles X 6 X 1023 = 3 x 10 22 1 3 moles of CO2 = 2.4 dm3// 2400cm3 Mass = 0.02 X 1022 (iv) 7d(i) No. CO2 : 12 + 2(16) = 44 3. of mol of product 1.1 X 44 = 4.05 moles X 6 x 1023 = 3 x 10 22 7(c)(i) Volume = 0. of molecules = 0. H2S : 2(1) + 32 = 34 4.9 18 = 0. of molecules = 0. N2 : 2 X 14 = 28 2.1 X 24 = 2.SULIT MOZ@C Section B No 7 (a) MARKING CRITERIA 1. and attain stable octet electron arrangement Atom Q has 7 valence electrons Atom gains/receives/accept 1 electron to formQ ion// Q + e-Qattain the stable /octet electron arrangement The two oppositely-charged ions// the P+ and Q. MELAKA .SULIT MOZ@C 20 8(a) Between P and Q Atom P has 1 valence electron Atom P loses/donates/transfers 1 electrons to form P+ ion // P P+ + e.ion are 1 1 1 - 1 1 1 bonded together by a strong electrostatic force To form a ionic compound with the formula PQ // Diagramn 1 P Q Between Y and Z Atom R has 4 valence electrons and atom Q has 1 valence electrons One atom R contributes 4 electrons and (each) atom Q contributes one electron for sharing Atom R shared 4 pairs of electron with 4 atoms Q to attain a octet /stable electron arrangement respectively Diagram 1 1 1 1 1 8 SMS MUZAFFAR SYAH . SULIT MOZ@C Q Q R Q Q 12 8(c) Compound M is an ionic compounds Compound N is a covalent compounds Compound M has high melting and boiling point Compound N has low melting and boiling point Strong electrostatic force of attraction exists between the ions /the oppositely-charged ions in compound M Weak intermolecular forces //held together by weak (Van der Waals) force of attractions between molecules in compound N 1 1 1 1 1 1 A lot of heat energy // high of energy is required to break the strong forces in the compound M 1 ● little heat energy //low energy is needed to overcome the weak forces in the compound N 1 8 20 9 SMS MUZAFFAR SYAH . MELAKA . Half-equation at anode: Zn → Zn2+ + 2e 4. 9(c) 1 1 1 1 1 1 1 1 1 1 9(d) Procedures: 2. Half equation at cathode: Ag+ + e → Ag 10. 1. Copper] a suitable electrolyte. Observation: iron spoon is covered with grey.Electrolyte is an ionic compound that can conduct electricity 1 2. The silver plate and the iron spoon are connected to the battery with the connecting wires. 1 4. lead(II) ions and Bromide ions cannot move 1 freely. Copper(II) sulphate solution] 3. 5. 2.5 – 2. Zinc at cathode: less electropositve metal. eg. The ions are held together with strong electrstatic forces 1 3. [complete and functional set-up of apparatus] 7. [50 – 200]cm3 of [0. Half-equation at cathode: Cu2+ + 2e → Cu 10 1 1 1 1 4 20 10 SMS MUZAFFAR SYAH . 4. silver plate. MELAKA . The silver plate is the anode and the iron spoon is the cathode. Half equation at anode: Ag → Ag+ + e 9. at cathode: iron spoon.eg. 1 4 1. The free moving ions carry the electrical charges. electrolyte: silver nitrate solution} 8. 1 2 1. the ions can move freely. [one example of voltaic cell with complete and functional set-up of apparatus: 2. In powdered form. silvery/shiny deposit. 3. eg.0] mol dm-3 of silver nitrate solution is poured into a beaker.in the molten state or aqueous solution. 6. [Labels: at anode: more electropositive metal. [labels: at anode: silver plate. The silver plate and the iron spoon are then dipped into the silver nitrate solution.SULIT MOZ@C Section C No 9(a) 9(b) MARKING CRITERIA MARK SUB TOTAL 1. In molten state. Chemicals required: silver nitrate solution. 1-2. ZnCO3 10b(i) + 2HNO3 Zn(NO3)2 + H2O + CO2 1 1 1 1 1 1 1 1 1 10 An alloy is a mixture of two or more elements with a certain fixed composition in which the major component is a metal 1 To increase the strength/ hardness of a pure metal increase the resistance to corrosion of a pure metal To improve the appearance of a pure metal To 1 1 1 (ii) (iii) In pure copper. MELAKA .g . 1 The layers of copper atoms are more difficult to slide over each 1 other. 10 Suitable chemical equations e.SULIT MOZ@C No 10(a) MARKING CRITERIA 1 Name of suitable reactant e.atoms are of the same size 1 atoms are orderly arranged in layers 1 the layers of atoms can slide over each one another when a force is 1 applied In brass. 10 20 11 SMS MUZAFFAR SYAH . 7 heat until saturated 8 The solution is allowed to cool 9 The crystals formed are filtered and by compressing/pressing between 2 sheets of filter paper. atoms of tin and copper have different size 1 the presence of tin atoms disrupt the orderly arrangement of the copper atoms.0 ]moldm-3 of nitric acid is poured into a beaker 3 Heat /Warm the acid 4 Add in zinc/zinc oxide/zinc carbonate into the acid bit by bit until in excess/ no longer dissolves 5 Stir the mixture and filter 6 The filtrate is poured into an evaporating dish.g: zinc/zinc oxide/zinc carbonate and nitric acid MARK SUB TOTAL 1 2 [50-200] cm3 of [0. SULIT MOZ@C Marking Scheme Paper 3 1 (a) KK0503 – Measuring and using numbers EXPLANATION [Able to write both temperatures with correct to 1 decimal place] temperature reading : 82.0 °C [Able to record all the volumes accurately but without decimal place] temperature reading : 82 temperature reading : 97 [Able to write at least one reading of the temperature accurately] No response given / wrong response 1 0 2 SCORE 3 1 (b) KK0506 – Communicating EXPLANATION [ Able to draw a graph of temperature against time of the experiment on the same axes with all the 4 items below correctly ] (i) axes labelled correctly with units (ii) suitable scale used (iii) all points plotted correctly (iv) smooth curve of graph and more than ½ size of graph paper SCORE 3 [ Able to draw a graph of temperature against time of the experiment on the same axes with all the 3 items correctly ] [ Able to manipulate two items correctly ] No response or wrong response 2 1 0 12 SMS MUZAFFAR SYAH .0 °C temperature reading : 97. MELAKA . SULIT MOZ@C 1 (c)KK0505 – Predicting EXPLANATION [Able to state the temperature correctly and able to show the how the melting point is determined on the graph] Answer: 82 .0 SCORE 3 82oC melting point [Able to state the temperature but without unit and did not label melting point on the graph correctly] Answer: 82 Melting point 2 [Able to state the temperature but without unit and did not show the melting point on the graph] Answer: 82 No response given / wrong response 1 0 1 (d) KK0508 – Interpreting Data EXPLANATION [Able to interpret the data accurately] Suggested answer: The heat energy absorbed is used to overcome the forces of attraction/bonds between the molecules of acetamide [Able to give correct interpretation but less accurate] Suggested answer: The heat energy is used to overcome the forces of attraction of molecules / particles of acetamide [Able to give an idea] Suggested answer: The heat energy is used / absorbed. No response given / wrong response SCORE 3 2 1 0 13 SMS MUZAFFAR SYAH . MELAKA . (iii) The way to maintain the fixed variable: Use the same quantity/size of metal. MELAKA . (ii) Responding variable: Rate of reaction//Reactivity of the reaction (ii) What to observe in the responding variable: The movement of metal on the water surface.SULIT 1 (e) KK0505 – Classifying MOZ@C EXPLANATION [Able to classify the ionic and covalent compounds correctly] Ionic Magnesium chloride Copper(II) nitrate Zinc sulphate Covalent Methylbenzene Tetrachloromethane Carbon dioxide SCORE 3 [Able to state at least two pairs correctly // correct grouping but wrong heading or vice versa ] [Able to state one pair correctly in a correct grouping] No response given / wrong response 2 1 0 2(a) KK0510 .State the variables EXPLANATION [Able to state the three variables and action to be taken correctly] Name of variables Action to be taken (i) Manipulated variable: (i) The way to manipulate Type of group 1 metals variable: used Use lithium. sodium and potassium metal for each experiment. [Able to state any five items correctly] [Able to state any four items correctly] [Able to state any three items correctly] [Able to state any two items correctly] [Able to state any one item correctly] No response given / wrong response 5 4 3 2 1 0 14 SMS MUZAFFAR SYAH . SCORE 6 (iii) Fixed variable: Quantity/size of metal used. Li No response given / wrong response 1 0 SCORE 3 2 1 0 2(d) KK0507. [Able to arrange the position of at least two metals in descending/ascending] Suggested answer: Na.SULIT MOZ@C 2 (b) KK0512 – Stating hypothesis EXPLANATION [Able to state the relationship between manipulated variable and responding variable correctly] Suggested answer: The metal which is below in Group 1 is more reactive in the reaction with water//The lower the metal in Group 1 the more reactive is the reaction with water. Li. K. [Able to state the relationship correctly but less accurate] Suggested answer: The reactivity of the metals is inversely proportional to their position in the group. the higher the reactivity of the metal. K. Na// Na. K// Li. [Able to state an idea of a relationship] Suggested answer: Position of metals affect the reactivity No response given / wrong response SCORE 3 2 1 0 15 SMS MUZAFFAR SYAH . Na.Making relationship EXPLANATION [Able to state the relationship accurately] Suggested answer: The lower the position of the metal in Group 1. [Able to state the relationship between manipulated variable and responding variable but in the opposite direction] Suggested answer: The more reactive the reaction. Li [Able to arrange the metals in ascending order based on their reactivity] Answer: Li. the lower the position of the metal in Group 1 SCORE 3 2 [Able to state an idea of the hypothesis] Suggested answer: Metals in Group 1 can react with water No response given / wrong response 2(c) KK 0508 – Interpreting Data EXPLANATION [Able to arrange the metals in descending order based on their reactivity] Suggested answer: K. K. MELAKA . Na. [Able to state an idea of statement of problem or aim] Metals influence the voltage values No response given / wrong response 3 (b) KK051202 – Stating variables EXPLANATION [Able to state all the three variables correctly] Suggested answer: Manipulated variable : types of pairs of metals Responding variable: voltage values//potential difference Constant variable : electrolyte used such as copper(II) sulphate solution. sodium and potassium when react with water [Able to predict the arrangement of the metals based on their reactivity] Suggested answer: The reaction of Rubidium is most reactive.(a) KK051021 – Statement of the problem EXPLANATION [Able to make a correct statement of problem] Suggested answer: Does the distance between two/ pair of metals in the electrochemical series give different voltage values? [Able to make a statement of the problem or suitable aim] Suggested answer: Does the distance between two /pair of metals give different voltage values?// Distance between two/pair of metals in the electrochemical series gives different voltage values. MELAKA . [Able to give an idea Suggested answer: Rubidium is a reactive metal No response given / wrong response SCORE 3 2 1 0 3.SULIT MOZ@C c2(e) KK 0508 – Predicting EXPLANATION [Able to predict the reactivity of rubidium correctly] Suggested answer: The reaction of Rubidium is most reactive among lithium. [Able to state any two of the variables correctly] [Able to state one of the variables correctly or state idea regarding variable] No response given / wrong response SCORE 3 SCORE 3 2 1 0 2 1 0 16 SMS MUZAFFAR SYAH . voltmeter. metals. zinc. [magnesium ribbon. MELAKA . [magnesium ribbon. sand paper. wire. connecting wires. voltmeter. the score is 2] [Able to state the relationship between manipulated variable and responding variable] Suggested answer: The further the distance /position between two metals. the bigger the voltage value. connecting wires. [If the responding variable comes first. copper].SULIT MOZ@C 3(c) KK051202 – Stating hypothesis EXPLANATION [Able to state the relationship between manipulated variable and responding variable correctly] Suggested answer: The further the distance/position between two metals in the electrochemical series.lead strip. crocodile clips. No response given / wrong response SCORE 3 2 1 0 17 SMS MUZAFFAR SYAH .[copper(II) sulphate solution] [Able to state an idea about the list of substances and apparatus] Suggested answer: Beaker. copper strip]. the bigger the voltage value//vice versa [Able to state an idea of the hypothesis] Suggested answer: Metals influence the voltage value No response given / wrong response SCORE 3 2 1 0 3(d) KK051205 – List of materials and apparatus EXPLANATION [Able to state the list of materialss and apparatus correctly and completely] Suggested answer: Beaker. [copper(II) sulphate solution] [Able to state the list of substances and apparatus correctly but not completely] Suggested answer: Beaker. electrolyte. zinc strip. voltmeter. 2.5 No response given / wrong response 3(f) Tabulation of data EXPLANATION [Able to exhibit the tabulation of data correctly ] Pairs of metals Voltage/V Negative terminal 3 [Able to exhibit the tabulation of data less accurately ] Pairs of metals Voltage 2 SCORE SCORE 3 2 1 0 [Able state an idea about the tabulation of data] Metals Voltage 1 No response given / wrong response 0 END OF MARKING SCHEME 18 SMS MUZAFFAR SYAH . 6. [30 -200] cm3 of copper(II) sulphate solution is poured into a beaker. 3.SULIT MOZ@C 3(e) KK051204 –Procedure EXPLANATION [Able to state a complete experimental procedure] Suggested answer: 1. 7. [Able to state the procedure which include the following steps] Answer: Steps 1. The circuit is completed. Steps 1 to 6 are repeated by using different of metals to pair with copper. 4. Both metals are connected to a voltmeter. The voltmeter reading is recorded.3. Magnesium ribbon and copper strip are cleaned with the sand paper. 5.4.5. Magnesium and copper are dipped into the copper(II) sulphate solution.6 [Able to state an idea of procedure] Answer: Steps 3. MELAKA .