2022 GMSS Chem Prelims P1

CHEMISTRY Paper 1 Multiple Choice 5073/01 Sec 4 Express 6092/01 Additional Materials: Multiple Choice Answer Sheet 1 hour 26 August 2022 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. 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 20. The use of an approved scientific calculator is expected, where appropriate. This document consists of 19 printed pages and 1 blank page. [Turn over Geylang Methodist School (Secondary) Preliminary Examination 2022

2 GMS(S)/ChemP1/Prelim/2022/4E 1 A gas is evolved during a reaction. Which two pieces of apparatus would enable the rate of this reaction to be measured? A balance and pipette B gas syringe and thermometer C stopwatch and gas syringe D stopwatch and pipette 2 The table shows the colours and the solubilities in water of four solids. solid colour solubility in water W blue insoluble X blue soluble Y white insoluble Z white soluble A mixture containing two of the solids is added to excess water, stirred and filtered. A blue filtrate and a white residue are obtained. Which two solids are present in the mixture? A W and X B W and Y C X and Y D X and Z

3 GMS(S)/ChemP1/Prelim/2022/4E 3 A mixture of three liquids is separated by fractional distillation. Which statements are correct? 1 The mixture boils at constant temperature throughout the separation. 2 The temperature at which the mixture boils increases during the separation. 3 The liquid with the highest boiling point is collected first. 4 The liquid with the lowest boiling point is collected first. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 4 Nitrogen dioxide is a dark brown gas and is denser than air. A gas jar containing nitrogen dioxide is sealed with a glass plate and is then inverted on top of a gas jar containing air. The glass plate is removed. Which one of the following correctly describes the colours inside the gas jars after a long period of time? upper gas jar lower gas jar A brown brown B dark brown light brown C colourless dark brown D light brown dark brown

4 GMS(S)/ChemP1/Prelim/2022/4E 5 The apparatus shown in the diagram was used to compare the