PRSS Chemistry 4E Prelim 2023 P1

Name Class Register Number SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION 2023 CHEMISTRY Paper 1 Multiple Choice Friday 1105 – 1205 6092/01 25 Aug 2023 1 hour Additional Material: 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 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 14. The use of an approved scientific calculator is expected, where appropriate. This document consists of 14 printed pages, including the cover page. Setter: Ms Chua Wei Tian [Turn over Pasir Ris Secondary School

PRSS_2023_S4E_PRELIM_CHEM_ 6092_P1 2 1 A mixture is separated using the apparatus shown. What is the likely identity of the mixture? A aqueous copper(II) sulfate and aqueous sodium chloride B aqueous copper(II) sulfate and calcium carbonate C copper and sulfur D ethanol and ethanoic acid 2 The formula of zinc oxide can be investigated by using the fact that when zinc is heated, it reacts with oxygen to form zinc oxide. Which apparatus is used for this investigation? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 3 Which statement about states of matter is correct? A When a gas cools, the particles cannot vibrate about its fixed positions. B When a liquid freezes, it becomes a solid and energy is released to the surroundings. C When a solid is heated, the size of particles increases. D When a solid melts, the particles get further apart and have less energy.

PRSS_2023_S4E_PRELIM_CHEM_ 6092_P1 3 4 The melting points and boiling points of some gases in air are shown. gas melting point / °C boiling point / °C argon –190 –187 nitrogen –210 –197 oxygen –220 –183 At which temperature will oxygen be the only liquid present? A –180°C B –185°C C –188°C D –200°C 5 Deuterium, D, is an isotope of hydrogen with a nucleon number of 2. Heavy water, D 2O, is water in which both the hydrogen atoms have been replaced with deuterium. It is commonly used in nuclear reactors. Some properties of ordinary water and heavy water are as shown. ordinary water, H2O heavy water, D2O relative molecular mass 18 20 melting point / ºC 0 3.8 boiling point / ºC 100.0 101.4 density / g/cm3 0.997 1.104 Which process can be used to recover heavy water from ordinary water? A cracking B fractional distillation C separating funnel D sim