2022 CCHS(M) Chem Prelims P1

[Turn over Name: Class: Class Register Number: Parent’s Signature ______________________ PRELIMINARY EXAMINATION 2022 SECONDARY 4 CHEMISTRY 6092/01 Paper 1 Multiple Choice 16 September 2022 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number clearly in the spaces provided at the top of this page. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages.

2 2022 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 1 Which mixture can be separated into its components by adding water, stirring and filtering? A ammonium carbonate and sodium chloride B calcium nitrate and barium chloride C iron(II) carbonate and potassium sulfate D copper and sulfur 2 The diagram below shows the reaction of an unknown substance. What is solid R? A zinc chloride B sodium carbonate C aluminium nitrate D calcium sulfate white crystalline solid R white precipitate aqueous salt white precipitate colourless solution add aqueous NaOH in excess add aqueous NaOH add water add dilute HNO3 followed by aqueous Pb(NO3)2

3 [Turn over 2022 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 3 The following reactions are carried out. reaction result propanoic acid is added to ammonium carbonate gas E is given off ammonium propanoate is warmed with aqueous sodium hydroxide gas F is given off propanoic acid is added to aqueous ammonia compound G is formed in a colourless solution What are E, F and G? gas E gas F compound G A ammonia carbon dioxide ammonium carbonate B ammonia carbon dioxide ammonium propanoate C carbon dioxide ammonia ammonium carbonate D carbon dioxide ammonia ammonium propanoate 4 In which of the following substances are the particles closest to one another at 25 oC? A dilute hydrochloric acid B copper(II) oxide C ethanol D carbon monoxide

4 2022 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 5 Two experimental set-ups to demonstrate the diffusion of gases are shown in the diagram below. What changes, if any, to the water levels at P and Q would you expect to see in both experiments? experiment 1 experiment 2 A P and Q remain the same Q is higher than P B P and Q remain the same P is higher than Q C Q is higher than P P is higher than Q D P is higher than Q Q is higher than P 6 Which statements comparing the properties of electrons, neutrons and protons are correct? neutrons and protons are both heavier than electrons only electrons and neutrons are charged A yes yes B yes no C no yes D no no carbon dioxide methane beaker beaker porous tube containing nitrogen and oxygen porous tube containing nitrogen and oxygen experiment 1 experiment 2

5 [Turn over 2022 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 7 Which diagram best shows the structure of a mixture? A B C D 8 Sodium nitrate is an ionic compound. Which statement is not correct? A Cations are formed when sodium atoms lose electrons. B The oppositely charged ions are held strongly together. C Nitrate ion is a positively charged polyatomic ion. D Sodium nitrate solution can conduct electricity. 9 In the molecules CH3OH, NH3 and HF, which atoms use all of their outer shell electrons in bonding? A C and H B C and F C N and H D H and O

6 2022 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 10 Element Q has a proton number 3. Element R has an electronic configuration 2,8,6. What would be the formula of the compound formed between Q and R? A QR B Q2R C QR2 D QR4 11 15 cm3 of ethene reacts with 60 cm 3 of oxygen at 150 oC in a reaction vessel according to the equation below. C2H4 + 3O2 → 2CO2 + 2H2O What is the total volume of gases at the end of the reaction in the reaction vessel? A 30 cm3 B 60 cm3 C 75 cm3 D 110 cm3 12 20 cm3 of an aqueous 1.0 mol/dm3 solution of the hydroxide of metal X exactly neutralises 40 cm3 of 0.25 mol/dm3 dilute sulfuric acid. What is the formula for the sulfate of X? A XSO4 B X(SO4)2 C X2SO4 D X2(SO4)3 13 In a reaction between 23 g of ethanol and excess hydrogen bromide, the mass of bromoethane obtained is 27 g. C2H5OH + HBr → C2H5Br + H2O What is the percentage yield of bromoethane? [Mr: C2H5OH, 46; C2H5Br, 109] A 25% B 50% C 60% D 85%

7 [Turn over 2022 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 14 2 g of an impure zinc oxide reacts with excess nitric acid to produce 3.97 g of zinc nitrate. What is the percentage purity of zinc oxide used? A 50% B 79% C 82% D 85% 15 In an electrolysis experiment, the same amount of charge deposited 68.9 g of silver and 6.64 g of chromium. What is the charge on the chromium ion? A +2 B +3 C +5 D +6 16 The diagram below shows apparatus used in an attempt to electroplate a metal ring with copper. The experiment did not work. What change is needed in the experiment to make it work? A Replace the graphite electrode with a copper electrode. B Reverse the connections to the battery. C Increase the temperature of the electrolyte. D Add solid copper(II) sulfate to the electrolyte. graphite electrode aqueous copper(II) sulfate

8 2022 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 17 Four electrolysis cells are set up. Each cell has platinum electrodes. These electrolytes are listed below. cell 1: aqueous zinc nitrate cell 2: dilute hydrochloric acid cell 3: molten sodium bromide cell 4: concentrated copper(II) chloride In which of these cells is a gas formed at both electrodes? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4 18 The energy profile diagram of a reversible reaction is shown below. A + B C + D Which of the following statements is correct about the energy profile diagram? A Activation energy of the backward reaction is given by –50 kJ/mol. B Enthalpy change of the backward reaction is given by +20 kJ/mol. C Activation energy of the forward reaction is given by +70 kJ/mol. D Enthalpy change of the forward reaction is given by +50 kJ/mol. energy / kJ/mol progress of reaction A + B C + D 90 40 20

9 [Turn over 2022 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 19 Which one of the following is an endothermic process? A Mixing of dilute sulfuric acid with aqueous sodium hydroxide. B Addition of lithium to cold water. C Heating of zinc carbonate to get zinc oxide. D Rusting of an iron nail. 20 Which of the underlined substance acts as a reducing agent? A Fe2O3 + 3CO → 2Fe + 3CO2 B Br2 + 2NaI → 2NaBr + I2 C H2O2 + NaOCl → O2 + NaCl + H2O D Cu(NO3)2 + Zn → Cu + Zn(NO3)2 21 Which of the following statements about an acid is correct? A pH is a measure of acid concentration in a solution. B A weak acid can have the same pH as a strong acid. C When an acid reacts with a reactive metal, hydrogen ions lose electrons. D Universal indicator turns blue when placed in an acid.

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