RGS 2021 Y4 Chem EYA

This Question Paper consists of 24 printed pages including the cover page. [Turn Over] INSTRUCTIONS TO CANDIDATES Write your name and register number in the spaces provided. Write in dark blue or black ink. For Section A, indicate your answers on the separate Answer Sheet provided. Answer all other questions in the space provided. All quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question. You may be penalised for incorrect use of units and/or not giving quantitative answers to an appropriate number of significant figures. A copy of the Periodic Table is provided on the last page of the Question Paper. The total number of marks for this paper is 80 and the weighting is 40%. Raffles Girls’ School (SECONDARY) Name: Class: Register No: CHEMISTRY YEAR FOUR End-of-Year Assessment Tuesday 5 October 2021 2 hours Parent’s / Guardian’s Name: Signature: Date: Established in 1879 For examiner’s use Question / Section Marks Obtained Section A / 20 1-20 Section B / 60 21 /6 22 /7 23 /7 24 /7 25 /9 26 /10 27 /14 statement/ units/ sig. fig. Total /80

Raffles Girls’ School (Secondary) Year 4 End-of-Year Assessment 2 Section A – Multiple Choice Questions [20 marks] Answer all questions. For each question, there are four possible answers ( A, B, C, and D). Choose the most appropriate answer and record your choice in the separate Answer Sheet provided. 1 Which row shows the source and effect of the pollutant? pollutant source effect A carbon monoxide combustion of fuels global warming B oxides of nitrogen lightning irritates eyes and lungs C sulfur dioxide acid rain volcanic eruptions D unburnt hydrocarbon decay of plant matter acid rain 2 Which pair of reagents is most suitable to prepare copper(II) chloride? A copper and dilute hydrochloric acid B copper(II) hydroxide and dilute hydrochloric acid C copper(II) nitrate solution and dilute hydrochloric acid D copper(II) sulfate solution and sodium chloride solution 3 The table provides information about the electrical conductivity of four substances. substance electrical conductivity in solid state in molten state in aqueous state W no no no X yes yes no Y no yes yes Z no no yes Which row is correct? W X Y Z A copper citric acid diamond sodium chloride B citric acid sodium chloride copper diamond C diamond copper sodium chloride citric acid D sodium chloride diamond citric acid copper

Raffles Girls’ School (Secondary) Year 4 End-of-Year Assessment 3 [Turn Over] 4 The structural formula of hydrazine, N2H4, is given below. What is the total number of electrons involved in bonding? A 5 B 6 C 10 D 14 5 The diagram shows part of the Periodic Table. P Q R S T U Which statement is correct? A T is denser than U. B Q is more reactive than S. C P has a lower melting point than T. D R has less metallic character than S. 6 Which equation represents an endothermic reaction? A C(s) + O2(g) → CO2(g) B CaCO3(s) → CaO(s) + CO2(g) C Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) D HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) H N N H H H

Raffles Girls’ School (Secondary) Year 4 End-of-Year Assessment 4 7 Which statement is correct about the Haber process? A Increasing the pressure speeds up the reaction. B Hydrogen is obtained from the fractional distillation of air. C A high yield of ammonia is favoured by high temperature. D Magnesium catalyst is used to increase the production of ammonia. 8 A molecule of hydrocarbon C 12H26 undergoes cracking to produce one hexane molecule and a number of ethene molecules. How many ethene molecules are produced? A 1 B 2 C 3 D 4 9 Gas pressure is one of the factors affecting the rate of reaction. Which reaction is not affected by changes in pressure? A CuO(s) + H2(g) → Cu(s) + H2O(l) B Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) C Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) D CO2(g) + Ca(OH)2(aq) → CaCO3(s) + H2O(l) 10 Ferrites are compounds that consist of iron oxide and one other metal. One such ferrite contains 18.5% calcium and 51.9% iron by mass. What is the empirical formula of the ferrite? A CaFe2O B CaFe2O4 C Ca2FeO2 D Ca4Fe2O

Raffles Girls’ School (Secondary) Year 4 End-of-Year Assessment 5 [Turn Over] 11 The diagram shows the fractional distillation of petroleum. Which row shows the fractions obtained? 1 2 3 4 A bitumen diesel kerosene petrol B kerosene petrol bitumen diesel C petrol kerosene diesel bitumen D diesel bitumen petrol kerosene 12 In what way is ammonia separated from the reaction mixture when it is produced during the Haber Process? A by dissolving the reactants B by cooling the reaction mixture C by filtering out the reactants using cotton wool D by passing the reaction mixture through fused calcium oxide 13 A 14.0 g sample of nitrogen gas contains the same number of atoms as 23.0 g of element Z which is monoatomic. What is the relative atomic mass of Z? A 7 B 14 C 23 D 46

Raffles Girls’ School (Secondary) Year 4 End-of-Year Assessment 6 14 Galvanising is a method used to coat the surface of iron with a layer of zinc or tin to prevent rusting. Which statement explains why zinc is a better choice than tin? A Zinc has a lower density than tin. B Zinc is more readily reduced than tin. C Zinc loses electrons more readily than tin. D Zinc has a lower relative atomic mass than tin. 15 The diagram shows a simple cell. Which statement is correct? A Zinc oxidises and becomes smaller. B Copper oxidises and becomes smaller. C Effervescence of hydrogen gas is observed at the zinc electrode. D Effervescence of oxygen gas is observed at the copper electrode. aqueous copper(II) sulfate zinc copper voltmeter

Raffles Girls’ School (Secondary) Year 4 End-of-Year Assessment 7 [Turn Over] 16 Small portions of aqueous potassium iodide and acidified potassium manganate( VII) were added to four solutions separately. The table shows the observation seen. solution number potassium iodide potassium manganate(VII) 1 colourless to brown purple to colourless 2 colourless to brown no observable change 3 no observable change purple to colourless 4 no observable change no observable change Which solution(s) show the presence of an oxidising agent? A 3 only B 1 and 2 only C 1 and 3 only D 2 and 4 only 17 How many isomers does C3H6Cl2 have? A 2 B 3 C 4 D 5 18 Cooking oil contains a mi xture of saturated and unsatura ted fats. An unsaturated fat molecule has a relative molecular mass of 300. 75 g of the fat reacts with 120 g aqueous bromine. How many carbon-carbon double bonds are there in each molecule of fat? A 2 B 3 C 4 D 6

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