catholic high school chemistry paper 1 prelim 2023

[Turn over Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme) CHEMISTRY 6092/01 Paper 1 Multiple Choice 29 August 2023 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, pencil clips, glue or correction fluid. Write your name, index number and class on the Answer Sheet in the spaces provided. There are forty questions in 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. 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 given on page 19. The use of an approved scientific calculator is expected, where appropriate. For examiner’s use only: Total / 40 This document consists of 19 printed pages.

2 1 The diagrams show four different methods of collecting gases. Which method is suitable for collecting a gas which has the properties described? method for collecting gas properties of gas A 1 less dense than air and soluble in water B 2 denser than air and soluble in water C 3 less dense than air and soluble in water D 4 denser than air and insoluble in water 2 A mixture of three liquids is separated by fractional distillation in the school laboratory. Which two statements are correct? 1 A pure sample of each liquid can be obtained after separation. 2 The mixture boils at constant temperature throughout the separation. 3 The three liquids are miscible with each other. 4 The three liquids are collected at the same time at different parts of the fractionating column. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 1 2 3 4

3 [Turn over 3 When heated, magnesium reacts with oxygen in the air to form magnesium oxide, a white powder. A student wants to investigate the percentage purity of a piece of magnesium ribbon. The student is given a balance and three sets of apparatus shown. Which sets of apparatus are suitable for his investigation? A 1, 2 and 3 B 1 and 3 only C 2 and 3 only D 2 only 4 Which substance should be pure for the intended use? A a drug for curing diseases B aluminium for making airplane bodies C petrol for car fuels D tap water for human consumption metal tongs metal tongs magnesium burning magnesium air heat magnesium heat tripod crucible 1 2 3

4 5 P and Q are all sa