161 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 2 1 (ii) Based on the experiment, explain the processes that occur in the chemical cell and the purifi cation of metal. HOTS Analysing [9 marks] (b) Diagram 4 shows the apparatus set-up to study the transfer of electrons at a distance. G U-tube B Carbon electrodes Galvanometer Sulphuric acid A Diagram 4 Part A is fi lled with potassium iodide solution and part B is fi lled with acidifi ed potassium dichromate(VI) solution. When the circuit is completed, the galvanometer needle defl ects. (i) Predict the observation at part B. Explain your answer. HOTS Evaluating [2 marks] (ii) State the direction of electron fl ow. Explain why there is a movement of electrons in the cell. Your explanation must be based on the concept of redox reaction. HOTS Analysing [7 marks] Answers 4 (a) (i) V V _ + Silver plate Porous pot Silver nitrate solution Voltmeter Zinc plate Zinc nitrate solution (ii) In the chemical cell: � – E0 value of Zn is more negative than E0 value of Ag. � – Zinc acts as negative terminal (anode) and silver acts as positive terminal (cathode). F5 Q&A Chemi 1(147-162).indd 161 11/1/2023 5:28:01 PM PENERBIT ILMU BAKTI SDN. BHD.
162 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 2 1 � – Zinc has a greater tendency to release electrons to form zinc ions, Zn2+. � – Half equation at the anode: Zn → Zn2+ + 2e– � � – Silver ions, Ag+ are discharged at the cathode to form silver atoms, Ag. � � – Half equation at the cathode: Ag+ + e– → Ag In the purifi cation of metal: � – Silver electrode which is connected to the negative terminal, acts as anode. � � – At the anode, silver electrode is oxidised to form silver ions, Ag+ . � � – Half equation at the anode: Ag → Ag+ + e– � – Silver electrode which is connected to the positive terminal, acts as cathode. � – At the cathode, silver ions, Ag+ are reduced to form silver atoms. � � – Half equation at the cathode: Ag+ + e– → Ag Common Error Candidates often mistaken between chemical and electrolytic cells. A chemical cell converts chemical energy to electrical energy. An electrolytic cell converts electrical energy to chemical energy. (b) (i) The purple colour solution turns colourless. Manganate(VII) ion, MnO4 – is reduced to manganese(II) ion, Mn2+. (ii) – Electrons fl ow from A to B through the connecting wires of the circuit. � – Iodide ion, I– acts as a reducing agent. – Iodide ion, I– releases electron and undergoes oxidation to form iodine molecule, I2 . � – Half equation of oxidation: 2I– → I 2 + 2e– � – Electrons accumulate on the carbon electrode immersed in potassium iodide solution and the electrode becomes the negative terminal. � – Electrons then travel to the positive terminal which is the carbon electrode immersed in acidifi ed potassium manganate(VII) solution. � – Manganate(VII) ions, MnO4 – receive electrons and reduced to manganese(II) ions, Mn2+. � – Half equation of reduction: MnO4 – + 8H + 5e– → Mn2+ + 4H2 O Common Error Candidates tend to draw arrows on the diagram to show the direction of electrons fl ow. The direction of electrons fl ow should be described in words. 4 (a) A higher voltage power supply can be generated by connecting a few number of chemical cells in series. (b) (i) Manganate(VII) ions, MnO4 – receive electrons to form manganese(II) ions, Mn2+. Exam Tips F5 Q&A Chemi 1(147-162).indd 162 11/1/2023 5:28:01 PM PENERBIT ILMU BAKTI SDN. BHD.
163 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 2 2 Types of Carbon Compounds 2.1 1 Which of the following is the structural formula of an unsaturated hydrocarbon? A H H H H C C C H H B H H H O H C C C C OH H H H C H CI H H C C C H H D H H H H C C C H H H H Answer: A Hydrocarbon contains only carbon and hydrogen atoms. Unsaturated hydrocarbon contains at least one double bond (C C) or triple bond (C C). 2 Which of the following best describes saturated hydrocarbons? A Compounds containing only hydrogen atoms and carbon atoms Paper 1 Objective Questions B Compounds containing only hydrogen atoms and carbon atoms with one triple bond C Compounds containing only hydrogen atoms and carbon atoms with one double bond D Compounds containing only hydrogen atoms and carbon atoms with only single bonds Answer: D Examples of saturated hydrocarbon are CH3 CH3 and CH3 CH2 CH3 . 3 Which of the following compounds is a saturated hydrocarbon? A Propane B Propene C Propanol D Chloropropane Answer: A Hydrocarbon must contains only carbon and hydrogen atoms. Saturated hydrocarbon contains only single bonds (C C). 4 What are the products formed when ethene undergoes a complete combustion? A Ethane and water B Carbon and hydrogen C Carbon dioxide and water D Carbon dioxide and hydrogen Textbook Pages: 64 – 110 Theme 2: Organic Chemistry 2 Carbon Compound CHAPTER F5 Q&A Chemi 2(163-174).indd 163 11/1/2023 5:29:09 PM PENERBIT ILMU BAKTI SDN. BHD.
164 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 2 2 Answer: C Ethene is an unsaturated hydrocarbon. Combustion of ethene: C2 H4 + 3O2 → 2CO2 + 2H2 O 5 A complete combustion reaction of one mole of an alkene in excess oxygen produces fi ve moles of water. What is the alkene? A Ethene C Pentene B Butene D Propene Answer: C Combustion of pentene: C5 H10 + 15 2 O2 → 5CO2 + 5H2 O 6 Diagram 1 shows the crude oil fractional distillation. I II III IV Crude oil Diagram 1 Which of the following is the correct uses and boiling point of the product? Product Uses Boiling point (°C) A I Cooking gas 300 B II Road pavement 40 C III Fuel for cars 160 D IV Fuel for ships and power plants 500 Answer: D Remember the products of petroleum fractional distillation at different temperatures. 2.2 Homologous Series 7 Which of the following homologous series is correctly matched to its functional group? Homologous series Functional group A Alcohol COO B Alkene C C C Ester COOH D Carboxylic acid OH Answer: B Functional groups of homologous series: Alcohol ( OH), ester ( COO ), carboxylic acid ( COOH) 8 What is the general formula of esters? A Cn H2n , n = 2, 3, … B Cn H2n+1OH, n = 1, 2, … C Cn H2n+1COOH, n = 0, 1, 2, … D CmH2m+1COOCn H2n+1, m = 0, 1, 2, … n = 1, 2, 3, … Answer: D Ester is a non-hydrocarbon with the functional group COO . F5 Q&A Chemi 2(163-174).indd 164 11/1/2023 5:29:09 PM PENERBIT ILMU BAKTI SDN. BHD.
165 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 2 2 9 Which statement is correct about alkanes? A Undergo esterifi cation B Undergo hydration reaction B Undergo substitution reaction C Undergo hydrogenation reaction Answer: C Alkanes are saturated hydrocarbons. Alkanes undergo combustion and substitution reactions. 10 Compound Y has the following properties. • Liquid state at room temperature. • Insoluble in water. What is compound Y? A Ethane B Ethanol C Ethanoic acid D Ethyl ethanoate Answer: D Ethanol and ethanoic acid are soluble in water. Ethane and ethyl ethanoate are insoluble in water. The boiling point of ethane is –89°C. Therefore, it exists as gas at room temperature. Ethanol, ethanoic acid and ethyl ethanoate exist in liquid state at room temperature. Chemical Properties and Interconversion of Compounds between Homologous Series 2.3 11 Diagram 2 shows the structural formulae of compound A and compound B. H H H H H H H C C C C C C H H H H H H H Compound A H H H H H H H C C C C C C H H H H H Compound B Diagram 2 Which of the following are the correct properties of compounds A and B? Compound A Compound B A Soluble in dilute acid Soluble in water B Reacts with bromine Does not react with bromine C Does not react with acidifi ed potassium manganate(VII) solution Reacts with acidifi ed potassium manganate(VII) solution D Produces more soot when it burns Does not produce soot when it burns Answer: C Compound A is hexane and compound B is hexene. Compound A is a saturated hydrocarbon, thus does not react with acidified KMnO4 solution. Compound B is an unsaturated hydrocarbon, thus reacts with acidified KMnO4 solution. The purple colour solution is decolourised. F5 Q&A Chemi 2(163-174).indd 165 11/1/2023 5:29:09 PM PENERBIT ILMU BAKTI SDN. BHD.
166 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 2 2 12 Diagram 3 shows the schematic reaction to convert ethanol to other organic compounds. Ethanol Ethyl butanoate Ethene I II Butanoic acid Diagram 3 Which of the following represent reactions I and II? I II A Oxidation Dehydration B Esterifi cation Hydration C Hydration Oxidation D Dehydration Esterifi cation Answer: D Alcohol undergoes dehydration to form alkene and water. Alcohol undergoes esterification with carboxylic acid to form ester and water. Alcohol undergoes oxidation to form carboxylic acid and water. 13 Liquid Q is refl uxed with propanol and a few drops of concentrated sulphuric acid to produce a sweet pleasant smell liquid. What is liquid Q? A Ethane B Propene C Ethanoic acid D Propyl butanoate Answer: C Liquid Q can be any carboxylic acid. Carboxylic acid reacts with alcohol to form ester and water. Ester has a unique characteristic which is pleasant sweet smell. Isomers and Naming based on IUPAC Nomenclature 2.4 14 Diagram 4 shows the structural formulae of two isomers. H H H H H C C C C H H H Br H H H H H H C C C C Br H H H H Diagram 4 Which of the following names can be used for naming both isomers? A Bromoethane B Bromobutane C Bromopentane D Bromopropane Answer: B The structural formulae have four carbon atoms and one bromine atom. Therefore, the parent chain is butane. Based on the IUPAC nomenclature: CH3CH2CHBrCH3: 2-bromobutane CH2BrCH2CH2CH3: 1-bromobutane 15 Diagram 5 shows the structural formula of a compound. H H H H H H C C C C C H H H H H CI Diagram 5 Which of the following is the isomer of the compound? A H H H H H C C C C CI H H H H F5 Q&A Chemi 2(163-174).indd 166 11/1/2023 5:29:10 PM PENERBIT ILMU BAKTI SDN. BHD.
167 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 2 2 B CH3 H C H H H H H C C C C H H H H H C H H CI H H C C C C H H H H CH3 D H CH3 H H C C C H CI H H Answer: C Diagram 5 is 1-chloropentane. A pentane molecule has 5 carbon atoms. H H CI H H C C C C H H H H CH3 2-chloro-3-methylbutane 16 Diagram 6 shows the structural formula of an isomer. H H C H H H H H H H C C C C C C H H H H H H H C H H Diagram 6 What is the name of the isomer based on the IUPAC nomenclature? A 2,3-dimethylbutane B 2,3-dimethylhexane C 2-ethyl-3-methylhexane D 2-ethyl-3-methylbutane Answer: B The longest chain has 6 carbon atoms. Therefore, the root name is hexane. The branches are methyl groups located at carbon number 2 and 3. Therefore, the prefix is 2,3-dimethyl. 1 2 3 4 5 6 H H C H H H H H H H C C C C C C H H H H H H H C H H F5 Q&A Chemi 2(163-174).indd 167 11/1/2023 5:29:10 PM PENERBIT ILMU BAKTI SDN. BHD.
168 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 2 2 Paper 2 Section A – Structured Questions 1 Table 1 shows the simple structural formula of four organic compounds, W, X, Y and Z. Organic compound Structural formula W H H H H H H H C C C C C C H H H H H H H X H H H H H H H C C C C C C OH H H H H H H Y H H H H H H H C C C C C C H H H H H Z H H O H H C C C O C H H H H Table 1 (a) Write the general formula of the homologous series of compound Y. Cn H2n, n = 2, 3, 4 … [1 mark] (b) Name compounds W and Z based on the IUPAC nomenclature. (i) Compound W: Hexane (ii) Compound Z: Methylpropanoate [2 marks] (c) State the suitable reagent and reaction condition to convert compound Y to compound X. Reagent: Phosphoric acid, H3 PO4 as catalyst. Conditions: Temperature of 300 °C and pressure of 60 atm. [2 marks] (d) Compound W can undergo combustion in excess oxygen to produce carbon dioxide and water. (i) Write the balanced chemical equation of the reaction. C6 H14 + 19 2 O2 → 6CO2 + 7H2 O [2 marks] F5 Q&A Chemi 2(163-174).indd 168 11/1/2023 5:29:10 PM PENERBIT ILMU BAKTI SDN. BHD.
169 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 2 2 (ii) If 21.5 g of compound W burns in excess oxygen, find the volume of carbon dioxide gas produced at room conditions. HOTS Evaluating [Relative atomic mass: C = 12, O = 16; 1 mole of gas occupies 24 dm3 at room conditions] Number of moles of compound W = 21.5 g ((6 × 12) + (14 × 1)) g mol–1 = 21.5 86 = 0.25 mol From the equation, 1 mole of C6 H14 produces 6 moles of CO2 . Number of moles of CO2 = 6 × 0.25 mol = 1.5 mol Volume of CO2 at room conditions = 1.5 mol × 24 mol dm–3 = 36 dm3 = 36 000 cm3 [4 marks] 1 (a) Compound Y is an alkene because it contains at least one corbon-carbon double bond (C C). (b) (i) Compound W has 6 carbon atoms, therefore the prefi x is hex-. Compound W is an alkane because it contains only single bonds between C and H atoms, therefore the suffi x is –ane. (ii) Compound Z is an ester because it has a carboxylate group ( COO ). (c) The process to convert alkene to alcohol is hydration. (d) Calculation steps: 1. Calculation of the number of moles from the information given. 2. Mole ratio from the balanced chemical equation. 3. Find the number of moles for the substance. 4. Calculate the volume of gas produced. Exam Tips 2 Diagram 1 shows the reaction involved in industrial production of margarine. C3 H5 [OOC(CH2 )7 CH=CH(CH2 )7 (CH3 )] + H2 Catalyst X Margarine Vegetable oil Temperature Y Diagram 1 (a) (i) Name the process to produce margarine in Diagram 1. Hydrogenation [1 mark] (ii) State one effect of this process on the structure of vegetable oil. The double bond in vegetable oil is converted to single bond. [1 mark] F5 Q&A Chemi 2(163-174).indd 169 11/1/2023 5:29:11 PM PENERBIT ILMU BAKTI SDN. BHD.
170 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 2 2 Common Error Candidates are confused about the hydrogenation process. Hydrogenation is the conversion of unsaturated hydrocarbon to saturated hydrocarbon. (iii) State catalyst X and temperature Y in the production of margarine. Catalyst X: Nickel Temperature Y: 180 °C [2 marks] (b) A compound with structural formula C2 H5 OH undergoes dehydration to produce ethene. (i) Suggest one dehydrating agent for this reaction. Porcelain chips/Concentrated sulphuric acid [1 mark] (ii) Draw an apparatus set-up for this dehydration reaction to collect ethene. HOTS Analysing Porcelain chips Gas jar Ethene gas Water Delivery tube Heat Boiling tube Glass wool soaked with ethanol [2 marks] Common Error Candidates did not draw a functional diagram. The diagram must includes the following: • The delivery tube in the water must be below the water level. • The boiling tube mouth must be shown in between the stopper. • Draw arrow for the heat at the correct position. • The delivery tube must be inserted into the boiling tube. • Dashed lines must be drawn to indicate the water or solution. F5 Q&A Chemi 2(163-174).indd 170 11/1/2023 5:29:11 PM PENERBIT ILMU BAKTI SDN. BHD.
207 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 1 1 Answer all questions Paper 1 [40 marks] 1 Which of the following is not a personal protective equipment that must be used when conducting experiments in the laboratory? A Laboratory shoes B Laboratory coat C Face mask D Dosimeter 2 Safety goggles must be worn when a student is conducting an experiment involving vapour Q. What is Q? A Hydrogen B Bromine C Oxygen D Water 3 Diagram 1 shows a fume cupboard located in a school laboratory. Diagram 1 What is the function of fume chamber? SPM Model Test A To heat chemicals B To dry specimens C To store chemicals D To carry out experiments that release toxic vapours 4 Diagram 2 shows an atomic model proposed by a scientist. Diagram 2 Who was the scientist? A Neils Bohr B J.J. Thomson C James Chadwick D Ernest Rutherford 5 The nucleon number of sodium atom is 23. Sodium atom has 11 protons. How many neutrons and electrons are there in a sodium atom? Neutron Electron A 12 12 B 12 11 C 11 12 D 1 11 1 hour 15 minutes F4n5 Q&A Chem MT(207-233).indd 207 11/1/2023 5:53:01 PM PENERBIT ILMU BAKTI SDN. BHD.
208 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 1 1 6 Diagram 3 shows the dinosaur bones found in North Borneo some time ago. Diagram 3 Archeologist estimated the age of the bones to be about 75 million years using a certain isotope. What is the isotope? A Cobalt-60 B Iodine-131 C Carbon-14 D Sodium-24 7 The following chemical equation represents the reaction between hydrochloric acid and excess magnesium powder. Mg + 2HCl → MgCl2 + H2 If 15.0 g of magnesium reacts with 100 cm3 of 2.0 mol dm–3 hydrochloric acid, what is the mass of the magnesium remains unreacted? [Relative atomic mass: Mg = 24] A 3.0 g B 4.8 g C 12.6 g D 15.0 g 8 Ethene burns in air according to the following equation. C2H4 + 3O2 → 2CO2 + 2H2O Calculate the mass of ethene burned if 4.3 g of carbon dioxide is produced. [Relative atomic mass: H = 1, C = 12, O = 16] A 1.36 g B 2.74 g C 5.47 g D 8.21 g 9 The reaction between lead(II) sulphate and sodium iodide solutions is represented by the following chemical equation. PbSO4 + 2NaI → PbI2 + Na2SO4 25.0 cm3 of 2.0 mol dm–3 sodium iodide solution is mixed with 25.0 cm3 of 2.0 mol dm–3 lead(II) sulphate solution. What is the maximum mass of lead(II) iodide produced in this reaction? HOTS Evaluating [Relative atomic mass: I = 127, Pb = 207] A 10.35 g B 11.53 g C 23.05 g D 46.11 g 10 The chemical formula of a complex compound is (NH4 )2 [CuCl4 ]. What is the molar mass? [Relative atomic mass: H = 1, O = 16, N = 14, Cu = 64, Cl = 35.5] A 122 B 228 C 242 D 434 F4n5 Q&A Chem MT(207-233).indd 208 11/1/2023 5:53:01 PM PENERBIT ILMU BAKTI SDN. BHD.
209 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 1 1 11 Diagram 4 shows a hot air balloon fi lled with a lightweight gas. Diagram 4 Which of the following might be the gas? A Helium gas B Oxygen gas C Fluorine gas D Hydrogen gas 12 Diagram 5 shows the uses of elements W and Y in our daily life. These elements are located in Period 3 of the Periodic Table of Elements. Element W Element Y Diagram 5 Which group locates elements W and Y? Element W Element Y A 13 15 B 12 13 C 15 13 D 17 15 13 Diagram 6 shows the electron arrangement of the atoms of elements X and Y. Both elements react to form a compound. X Y Diagram 6 Which statement is correct about the physical property of the compound formed. A Conducts electricity in molten state and aqueous solution B Solid at room temperature C Low boiling point D Soluble in water 14 Which of the following substances is basic? A Carbon dioxide B Sulphur dioxide C Aluminium oxide D Sodium hydroxide 15 Diagram 7 shows the atoms arrangement in an alloy. Copper Kuprum Tin Stanum Tin Diagram 7 F4n5 Q&A Chem MT(207-233).indd 209 11/1/2023 5:53:02 PM PENERBIT ILMU BAKTI SDN. BHD.
210 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 1 1 What is the alloy? A Bronze B Pewter C Brass D Steel 16 Table 1 shows the total volume of oxygen collected in the decomposition of hydrogen peroxide catalysed by manganese(IV) oxide. Time (min) Volume of gas (cm3) 0 0 1 10.40 2 22.30 3 26.50 4 27.30 5 31.30 6 31.30 Table 1 What is the average rate of reaction? A 5.22 cm3 min–1 B 6.26 cm3 min–1 C 10.83 cm3 min–1 D 24.85 cm3 min–1 17 The following chemical equation represents a reaction to prepare a soluble sulphate salt. H2 SO4 + X → Sulphate + H2 O What is substance X? A Iron(II) oxide B Barium oxide C Lead(II) oxide D Calcium oxide 18 Diagram 8 shows a badminton racquet made of graphite composite. What is the advantage of this badminton racquet compared to the one made of steel? Diagram 8 A More resistant to corrosion B Lightweight C Cheaper D Harder 19 Diagram 9 shows a part of a car engine bearing. Diagram 9 Which of the following explains why ceramic is used to make bearings? A Ceramic is more brittle B Ceramic is harder and stronger C Ceramic can withstand high temperature D Ceramic is a good electrical conductor 20 Iron(II) ion, Fe2+ can be converted to iron(III) ion, Fe3+ by adding acidifi ed potassium manganate(VII) solution. Which of the following can replace acidifi ed potassium manganate(VII) solution in the reaction? F4n5 Q&A Chem MT(207-233).indd 210 11/1/2023 5:53:03 PM PENERBIT ILMU BAKTI SDN. BHD.
211 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 1 1 A Zinc powder B Chlorine water C Potassium iodide solution D Potassium hexacyanoferrate(III) solution 21 Which of the following is true when a mixture of carbon and lead(II) oxide is heated strongly? A The oxide ion loses two electrons B The lead(II) ion accepts two electrons C The lead(II) oxide acts as a reducing agent D The oxidation number of carbon increases from 0 to +2 22 Diagram 10 shows the set-up of apparatus used to electroplate an iron spoon with silver. A Silver sulphate solution Iron spoon Silver plate Diagram 10 What can be observed at the anode and cathode after 30 minutes? Anode Cathode A Grey deposits are formed Gas bubbles are released B Silver plate becomes thinner Grey deposits are formed C Grey deposits are formed Silver plate becomes thicker D Silver plate becomes thicker Grey deposits are formed 23 Electrolyte substances can conduct electricity in either molten state or aqueous solution and undergo chemical changes. Which of the following is true about electrolytes? A Have free moving ions B Have free moving atoms C Have free moving molecules D Have water molecules in their compound 24 What is the oxidation number of chromium in CrCl3 ? A –3 B +3 C +5 D +6 25 Which of the following reactions is not a redox reaction? A Zinc burns in oxygen gas B Copper(II) oxide powder is added into nitric acid C Zinc metal is added into copper(II) sulphate solution D Bromine water is added into potassium chloride solution F4n5 Q&A Chem MT(207-233).indd 211 11/1/2023 5:53:04 PM PENERBIT ILMU BAKTI SDN. BHD.
212 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 1 1 26 Diagram 11 shows a voltaic cell V Electrode Q Electrode P Aqueous salt solution of Q Aqueous salt solution of P Voltmeter Switch Aqueous salt solution of Q Diagram 11 Which of the following pairs of metals produce the fl ow of electrons from electrode P to electrode Q? Electrode P Electrode Q I Zinc Magnesium II Zinc Copper III Iron Magnesium IV Copper Silver A I and II B I and III C II and IV D III and IV 27 Which of the following can undergo substitution reaction? A Propanol B Propene C Propane D Propyne 28 The following equation shows the conversion of hexanol to hexene. C6 H13OH Process X Heat C6 H12 + H2 O What is process X? A Oxidation B Hydrolysis C Dehydration D Hydrogenation 29 Diagram 12 shows the structural formula of a compound. H H H C C C C H H H H O H H C O H Diagram 12 What is the name of the compound? A Butyl methanoate B Methyl butanoate C Propyl ethanoate D Ethyl butanoate 30 Diagram 13 shows the structural formula of an organic compound. H H C H H C H C H H C C H H H Diagram 13 What is the name of the compound based on the IUPAC nomenclature? A 3-methylbut-2-ene B 3-methylbut-1-ene C 2-methylbut-1-ene D Pent-1-ene F4n5 Q&A Chem MT(207-233).indd 212 11/1/2023 5:53:04 PM PENERBIT ILMU BAKTI SDN. BHD.
213 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 1 1 31 Which of the following are the similarities among the members of the same homologous series? I General formula II Physical properties III Chemical properties IV Mass A I and II B I and III C II and IV D III and IV 32 50.0 cm3 of hydrochloric acid and 50.0 cm3 of sodium hydroxide solution were mixed together in a polystyrene cup. The mixture was stirred. The temperature of the mixture increases from 28 °C to 42 °C. What is the heat released during the experiment? HOTS Evaluating [Specifi c heat capacity of solution = 4.2 J g–1 °C–1; Density of solution = 1 g cm–3] A 2 940 J B 5 460 J C 5 880 J D 8 190 J 33 Table 2 shows the heat of neutralisation for the reaction between sodium hydroxide with hydrochloric acid and sulphuric acid. Reactants Heat of neutralisation (kJ mol–1) Sodium hydroxide solution and hydrochloric acid –57.0 Sodium hydroxide solution and sulphuric acid –114.0 Table 2 Which is the best statement to explain the results? A The reaction between sodium hydroxide solution and sulphuric acid is an exothermic reaction B Sodium hydroxide solution absorbs some of the heat energy released to complete its ionisation in water C Complete neutralisation between sulphuric acid and sodium hydroxide solution produces twice the quantity of heat compared to hydrochloric acid D Complete neutralisation between hydrochloric acid and sodium hydroxide solution produces twice the quantity of heat compared to sulphuric acid 34 Diagram 14 shows the changes in the molecular structure of polythene. P Q Diagram 14 F4n5 Q&A Chem MT(207-233).indd 213 11/1/2023 5:53:04 PM PENERBIT ILMU BAKTI SDN. BHD.
214 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 1 1 What are processes P and Q? P Q A Depolymerisation Polymerisation B Polymerisation Depolymerisation C Fermentation Esterification D Esterification Fermentation 35 Vulcanised rubber is widely used globally to make tyres. What is the special property that makes vulcanised rubber suitable to be used for making these tyres? A It is harder and stronger B It resists to the oxidation C It can withstand high heat D It can maintain the elasticity 36 Which of the following is the advantage of Green Technology to the country? A Waste management becomes more effective B Increases the rate of environmental pollution C Increases the usage of non renewable energy D Reduces the problem of unemployment 37 Diagram 15 shows a process in food industry. Palm oil Minyak kelapa sawit Margarine Marjerin Palm oil Margarine Process P Diagram 15 What is process P? A Hydrogenation B Saponification C Coagulation D Hydrolysis 38 Alif bought a new automatic washing machine. This machine will stop working if the cleaning agent used forms too much foam. Which of the following additives must be added to the cleaning agent to prevent the formation of excessive foams during washing? A Lipase B Sodium sulphate C Sodium perborate D Alkyl monoethanolamide F4n5 Q&A Chem MT(207-233).indd 214 11/1/2023 5:53:05 PM PENERBIT ILMU BAKTI SDN. BHD.
215 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 1 1 39 Diagram 16 shows various types of cosmetics available in the market. However, consumers must ensure that the substances used in the cosmetics are safe and free from harmful chemicals. Diagram 16 Which of the following harmful chemicals is matched correctly to its side effects? Harmful chemical Side effects A Mercury Damage the kidney and nervous system B Tretinoin Skin irritation C Glycerin Skin irritation D Iron(III) oxide Cancer 40 Graphene has been widely used to make censors, especially in the medical fi eld. Aurum electrode Graphene Aurum electrode Diagram 17 Which of the following physical characteristics is the important characteristic of graphene as a good censor? A Strong B Large surface area C Energy lasts longer D High mechanical strength F4n5 Q&A Chem MT(207-233).indd 215 11/1/2023 5:53:05 PM PENERBIT ILMU BAKTI SDN. BHD.
216 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 1 1 1 Diagram 1 shows part of the Periodic Table of Elements. V, W, X, Y and Z do not represent the actual symbols of the elements. V W X Y Z Diagram 1 By using the letters in the Periodic Table of Elements in Diagram 1, answer the following questions. (a) (i) State an element that exists as monoatomic gas. [1 mark] (ii) Write the electron arrangement of the atom of element in 1(a)(i). [1 mark] (iii) Give one use of element in 1(a)(i) in daily life. HOTS Applying [1 mark] (b) What is the trend of changes in the physical state for elements X, Y and Z from left to right? HOTS Analysing [2 marks] Section A [60 marks] Answer all questions from this section. Section A Answer all questions from this section. Paper 2 2 hours 30 minutes [60 marks] F4n5 Q&A Chem MT(207-233).indd 216 11/1/2023 5:53:05 PM PENERBIT ILMU BAKTI SDN. BHD.
217 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 1 1 2 Diagram 2 shows the graph of temperature against time when solid P is heated. Temperature (°C) Time (s) t 1 28 83 136 200 t 2 t 5 t 4 t 3 Diagram 2 (a) What is meant by melting point? [1 mark] (b) State the boiling point of substance P. [1 mark] (c) What is the change in physical state of substance P from t 1 to t 2 ? [1 mark] (d) Explain why the temperature remains constant from t 1 to t 2 . HOTS Evaluating [2 marks] F4n5 Q&A Chem MT(207-233).indd 217 11/1/2023 5:53:05 PM PENERBIT ILMU BAKTI SDN. BHD.
234 SPM Model Test Answers Chapter Form 4 Chapter Form 5 13 1 1 SPM Model Test Paper 1 1 D 2 B 3 D 4 D 5 B 6 C 7 C 8 A 9 B 10 C 11 A 12 C 13 C 14 D 15 A 16 B 17 A 18 B 19 C 20 B 21 B 22 B 23 A 24 B 25 D 26 C 27 C 28 C 29 B 30 B 31 B 32 D 33 C 34 B 35 D 36 A 37 A 38 D 39 A 40 B Paper 2 Section A 1 (a) (i) W (ii) 2.8 (iii) Used in light of advertisement boards. (b) From solid (X and Y) to gas (Z). 2 (a) Melting point is the temperature when solid turns into liquid. (b) 136 °C (c) Solid to liquid (d) Heat energy absorbed by the particles is used to overcome the attraction forces between the particles until all the solid changes to liquid. 3 (a) Empirical formula is the simplest whole number ratio of elements in a compound. (b) (i) Substance Mass (g) Copper 22.4 Oxygen 5.6 (ii) Element Copper, Cu Oxygen, O Mass (g) 22.4 5.6 Number of moles = 22.4 64 = 0.35 = 5.6 16 = 0.35 Mole ratio, Cu : O 0.3 : 0.35 Simplest mole ratio 1.1 (iii) CuO 4 (a) Strong alkalis are substances that ionise completely in water to produce high concentration of hydroxide ions, OH–. (b) (i) Sulphuric acid (ii) Because sulphuric acid is a strong acid and it ionises completely in water to produce high concentration of hydrogen ions, H+ . (c) (i) H2SO4 + 2NaOH → Na2SO4 + 2H2O (ii) M1 V1 = M2 V2 0.5 mol dm–3 × 20 cm3 = M2 × 25 cm3 M2 = y = 20.5 mol dm–3 × 20 cm3 25 cm3 = 0.4 mol dm–3 5 (a) Zinc oxide (b) (i) Zinc carbonate (ii) Filtration method (c) (i) 2Zn(NO3 )2 → 2ZnO + O2 + 4NO2 Answers F4n5 Q&A Chemis Ans(234-.indd 234 6/1/2023 6:05:34 PM PENERBIT ILMU BAKTI SDN. BHD.
235 SPM Model Test Answers Chapter Form 4 13 Chapter Form 5 13 1 1 (ii) Number of moles of Zn(NO3 )2 = 37.8 g 189 = 0.2 mol 2 moles of Zn(NO3 )2 : 4 mol NO2 0.2 mol Zn(NO3 )2 : 0.4 mol NO2 Volume of NO2 = 0.4 × 24 dm3 = 9.6 dm3 = 9 600 cm3 6 (a) C4H9OH + 6O2 → 4CO2 + 5H2O (b) (i) Q = mcθ = 500 × 4.2 × 30 = 63 000 J = 63 kJ (ii) Number of moles of C4H9OH = 18 74 = 0.02 mol (iii) ∆H = 63 000 0.02 = –3 150 000 J mol–1 = –3 150 kJ mol–1 (c) C4 H9OH + 6O2 Energy H = – 3 150 kJ mol –1 4CO2 + 5H2 O (d) Spirit lamp is weighed immediately to avoid loss of the mass of alcohol due to vaporisation/Use wind shield to avoid heat lost to the surroundings 7 (a) (i) B (ii) – Stomach discomfort – Wind in the body (iii) – Easily available – Natural sources (b) (i) R: Analgesic S: Corticosteroid T: Antimicrobial (ii) – Aspirin – Paracetamol (iii) – Moon face (facial swelling) – High blood pressure – Blood sugar level increases (iv) Antibiotics must be fully consumed so that all bacteria are killed. Otherwise, the bacteria will become resistant to it and the disease will recur. 8 (a) Fermentation (b) H H H C C H H OH (c) (i) CnH2n, n = 2, 3, 4… (ii) Add a few drops of bromine water into compound Y. Brown colour bromine water is decolourised. (d) (i) Carboxyl group, –COOH (ii) C2H5OH + 2[O] CH3COOH + H2O (e) – Pour 2 cm3 of ethanoic acid into a boiling tube. Add 4 cm3 of compound Y (ethanol). Add five drops of concentrated sulphuric acid into the mixture by using a dropper and shake the boiling tube. Heat the mixture gently with a small flame to bring it to a boil for 2 to 3 minutes. Pour the content of the boiling tube into a beaker half filled with water. The propyl ethanoate layer will float on water. Section B 9 (a) (i) Contact process [1] Vanadium(V) oxide as catalyst, temperature of 450 °C – 550 °C, pressure of 1 atm. [3] (ii) When sulfur dioxide combines with water and air, it forms sulphuric acid, which is the main component of acid rain. [2] F4n5 Q&A Chemis Ans(234-.indd 235 6/1/2023 6:05:34 PM PENERBIT ILMU BAKTI SDN. BHD.