2022 ANDSS Chem Prelims P1

This document consists of 19 printed pages and 1 blank page. Setter: Mr Wong FK O ANDERSON SECONDARY SCHOOL Preliminary Examination 2022 Secondary Four Express CANDIDATE NAME: CLASS: / INDEX NUMBER: CHEMISTRY Paper 1 6092/01 22 August 2022 1 hour 0800 – 0900 h Additional Materials : 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 index number on the Question Paper and 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 Periodic Table is printed on page 19. The use of an approved scientific calculator is expected, where appropriate. _______________________________________________________________________________

PRELIM 4E CHEM 2022 6092/01 2 1 The Rf values for the dyes P, Q, R and S, in four different solvents are shown in the table. solvent water ethanol propanone tetrachloromethane dye P 0.3 0.9 0.7 0.5 dye Q 0.0 0.8 0.6 0.2 dye R 0.5 0.7 0.6 0.1 dye S 0.0 0.6 0.4 0.2 Which solvent could be used to separate a mixture of all the four dyes? A ethanol B propanone C tetrachloromethane D water 2 The diagram below shows an apparatus that can be used to obtain a stream of nitrogen from air. Using this apparatus, which set of substances labelled X, Y and Z gives the purest sample of nitrogen? X Y Z A B C D aqueous calcium hydroxide concentrated sulfuric acid sodium hydroxide solution concentrated sulfuric acid calcium chloride solution aqueous calcium hydroxide concentrated sulfuric acid sodium hydroxide solution sulfur carbon copper carbon

PRELIM 4E CHEM 2022 6092/01 3 3 The information on two substances P and Q are given below. substance P Q arrangement of particles close and not orderly regularly arranged and very close movement of particles sliding around randomly vibrating about their fixed positions Four substances are given below. substance description 1 copper at 100 C 2 ethanol at 25 C 3 oxygen at 10 C 4 water at 200 C Which row shows substances P and Q? P Q A 1 2 B 2 1 C 3 4 D 4 1 4 A student conducted an experiment to determine how much hydrochloric acid is exactly required to neutralise 25.0 cm3 of aqueous potassium hydroxide. Without the use of an indicator, which piece of apparatus does he require to determine the end-point of the reaction? A electronic balance B gas syringe C stopwatch D thermometer

PRELIM 4E CHE