Yuan Ching Prelim P1

1 YUAN CHING SECONDARY SCHOOL Secondary Four Express Course Preliminary Examination 2024 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 27 Aug 2024 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 index number on the Answer Sheet in the spaces provided unless this has been done for you. 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. The use of an approved scientific calculator is expected, where appropriate. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on Page 22. The total number of marks for this paper is 40. This paper consists of 22 printed pages.

2 1 A student wants to carry out an experiment to follow the rate of the reaction between hydrochloric acid and marble chips. CaCO3 + 2HCl → CaCl2 + CO2 + H2O Which diagrams show apparatus that is suitable for this experiment? 1 2 3 4 A 1 and 2 only B 1 and 3 only C 1 and 4 only D 1, 2 and 4

3 2 Solutions of lead(II) nitrate and potassium iodide are mixed together in the preparation of lead(II) iodide. Which method can be used to separate the lead(II) iodide from the mixture? A crystallisation B distillation C evaporation D filtration 4 Which of the following substances can be used to distinguish these three gases:  hydrogen  carbon dioxide  oxygen A blue litmus paper B glowing splint C lighted splint D limewater 3 A small amount of aqueous copper(II) sulfate is put into a test-tube. A few drops of aqueous ammonia are added to the test-tube. Then an excess of aqueous ammonia is added to the same test-tube. What are the two observations? few drops of aqueous ammonia excess aqueous ammonia A dark blue solution dark blue solution B dark blue solution light blue solution C light blue solution dark blue solution D light blue solution light blue solution

4 5 Naphthalene present in mothballs has a melting point of 80.26 °C. A heated sample of pure naphthalene is cooled and the temperature is recorded every minute. A graph of the results is shown. Which process occurs between 6 and 10 minutes? A boiling B condensing C freezing D melting

5 6 Ethanol forms a miscible mixture with water. A student mixes 25 cm3 of ethanol with 25 cm3 of water. Which diagram best represents the mixture? 7 Carbon has two isotopes, 12C and 13C. Using these isotopes, which of the following is unlikely the relative molecular mass for the compound with molecular formula C2H4? A 27 C 29 B 28 D 30

6 8 The compound formed between elements X and Y is ionic. Which statement about elements X and Y is correct? A X and Y are both at the left-hand side of the Periodic Table. B X and Y are both at the right-hand side of the Periodic Table. C X and Y are both transition elements. D X is at the opposite side of the Periodic Table from Y. 9 The lamp shown in the diagram does not light up. Distilled water is then added to the beaker and the lamp lights up. Which statement explains these results? A Electrons are free to move in the solution when potassium bromide dissolves. B Metal ions are free to move when potassium bromide melts. C Metal ions are free to move when potassium reacts with water. D Oppositely charged ions are free to move in the solution when potassium bromide dissolves in water.

7 10 Propene, CH3CH=CH2, has a very low boiling point because of the weakness of the A C–C bond. B C=C bond. C C–H bond. D intermolecular forces. 11 What is the empirical formula of a compound containing 12 g of carbon, 2 g of hydrogen and 16 g of oxygen only? A CHO C CH 2O B CHO2 D C 2HO 12 Which fertiliser contains the greatest percentage by mass of nitrogen? A CO(NH2)2 B NH4NO3 C (NH4)2HPO4 D (NH4)2SO4 13 A volume of ethane, C2H6, at r.t.p. has a mass of 20 g. What is the mass of an equal volume of propene, C3H6, at r.t.p.? A 20 g C 28 g B 21 g D 42 g 14 Which of these processes are both endothermic? A combustion, cracking B combustion, fermentation C cracking, photosynthesis D fermentation, photosynthesis

8 15 The diagram below shows the energy profile diagram for a catalysed reaction. Which of the following statement explains this diagram? A It lowers the activation energy so that the reactants have more energy to collide more frequently. B It increases the activation energy to allow the reactants to have greater frequency of effective collisions. C It provides an alternative pathway that allows reactants to gain more kinetic energy to collide effectively and frequently. D It provides an alternative pathway with lowered minimum amount of energy required for reaction so that more reactants can collide effectively per unit time. 16 Which reaction does not involve either oxidation or reduction? A C (s) + O2 (g)  CO2 (g) B N2(g) + 3H2 (g)  2NH3 (g) C Pb(NO3)2 (s)  PbO (s) + 2NO2 (g) + O2 (g) D ZnCO3 (s) + 2HNO3 (aq)  Zn(NO3)2 (aq) + CO2 (g) + H2O (l)

9 17 In which equations is manganese being an oxidising agent? A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only 18 Which row correctly classifies the oxides in the table? carbon dioxide copper(II) oxide zinc oxide A acidic amphoteric basic B acidic basic amphoteric C acidic neutral amphoteric D basic neutral neutral 19 One mole of compound X gives three moles of ions in aqueous solution. X reacts with ammonium carbonate to form an alkaline gas. What is compound X? A aqueous ammonia B calcium hydroxide C sodium hydroxide D sulfuric acid

10 20 Which mixture would react with dilute sulfuric acid to form two different gases? A copper and magnesium carbonate B copper(II) carbonate and magnesium C copper(II) carbonate and magnesium oxide D copper(II) oxide and magnesium 21 The table gives information about the solubilities of the hydroxides, carbonates and sulfates of calcium, sodium and zinc. hydroxide carbonate sulfate calcium slightly soluble insoluble slightly soluble sodium soluble soluble soluble zinc insoluble insoluble soluble What is the best way of making zinc carbonate? A Shake aqueous zinc sulfate with aqueous sodium carbonate. B Shake aqueous zinc sulfate with solid calcium hydroxide and bubble in carbon dioxide. C Shake solid zinc hydroxide with aqueous sodium hydroxide and bubble in carbon dioxide. D Shake solid zinc sulfate and solid calcium carbonate with water. 22 The positions of four elements are represented and shown on the outline of part of the Periodic Table. Which letter represents a solid non-metal at r.t.p.?