2022 WDL Chem Prelims P1

EXPRESS EXPRESS EXPRESS Name: ........................................................................ ( ) Class: ................ WOODLANDS SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 EXPRESS Level: Secondary Four Express Marks: 40 Subject: Chemistry Day: Wednesday Paper: 6092/01 Date: 24th August 2022 Duration: 1 hour Time: 1235 – 1335 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name 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. Any rough working should be done in this booklet. At the end of the examination, submit the OTAS separately from the question paper. A copy of the Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. DO NOT TURN THE PAGE UNTIL YOU ARE TOLD TO DO SO. This document consists of 17 printed pages and 1 blank page. ���

2 6092/PRELIM/P1/2022 EXPRESS EXPRESS EXPRESS 1 Which one of the following apparatus is suitable for measuring 11.60 cm3 of acid? A burette B conical flask C measuring cylinder D pipette 2 Which one of the following correctly describes the particles in a dilute sugar solution at room temperature? sugar molecules water molecules A close together, moving at random widely separated, vibrating slightly B widely separated, moving at random close together, moving at random C widely separated, moving at random close together, not moving D widely separated, not moving widely separated, moving at random 3 The diagram below shows two gas jars separated by a glass lid. The upper gas jar contains brown nitrogen dioxide while the lower gas jar contains colourless hydrogen gas. nitrogen dioxide hydrogen gas glass lid When the glass lid is removed, both gas jars are coloured brown in a short time. What is the reason for this observation? A All molecules are in constant, random motion. B Nitrogen dioxide diffused faster than hydrogen gas. C Nitrogen dioxide is heavier than hydrogen gas. D Nitrogen dioxide reacted with hydrogen gas. ���

3 6092/PRELIM/P1/2022 EXPRESS EXPRESS EXPRESS 4 Which of the following tests is/are best to show that a solution