2022 BSS Chem Prelims P1

1 6092/1/9/22 [Turn over Name Class Index Number BROADRICK SECONDARY SCHOOL SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION 2022 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/01 Sept 2022 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paperclips, highlighters, glue or correction fluid. Write your name, class and register number on top of this page and on any separate answer paper used. 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 15. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages including this cover page. Setter : MR. LIANG ZW ��

2 6092/1/9/22 1 In a titration, 25.0 cm3 of aqueous sodium hydroxide is transferred into a conical flask. A few drops of indicator are added. Dilute hydrochloric acid is then added to the flask until the end-point is reached. Which pieces of apparatus are used to measure volume in this experiment? to measure dilute hydrochloric acid to measure aqueous sodium hydroxide A burette beaker B burette pipette C pipette pipette D pipette beaker 2 Which gas is not obtained industrially by fractional distillation? A ammonia B argon C nitrogen D oxygen 3 An impure sample of compound X has a melting point of 120 oC. X is purified and its melting point is measured again. Which row is correct? method of purifying X melting point of pure X / oC A crystallisation 115 B distillation 115 C crystallisation 125 D distillation 125 4 When dilute hydrochloric acid is added to a white powder, a gas is produced. The solution remaining is tested separately with small volumes of both aqueous ammonia and aqueous sodium hydroxide. A white precipitate is produced in both tests. What is the white powder? A aluminium oxide B calcium oxide C copper(II) carbonate D zinc carbonate ��

3 6092/1/9/22 [Turn over 5 Which statement explains why isotopes of the same element have the same chemical properties? A They have the same electronic structure. B They have the same relative mass. C They have the same nucleon number. D They have the same proton number. 6 An aqueous solution of a sulfate is made from a solid hydroxide, of a metal M, by the reaction: M(OH)2(s) + H2SO4(aq) → MSO4(aq) + 2H2O(l) For which hydroxide would the method not work? A barium hydroxide B copper(II) hydroxide C iron(II) hydroxide D magnesium hydroxide 7 A covalent compound P has the empiric