2023 RVHS 6092 Chem Prelim P1, P2, MS

River Valley High School Pg 1 of 16 Sec 4 RVIP Chemistry End-of-Year Examination 2023 RIVER VALLEY HIGH SCHOOL SEC 4 END-OF-YEAR EXAMINATION CHEMISTRY PAPER 1 9 OCTOBER 2023 1 HOUR NAME CLASS 4 INDEX NO. READ THESE INSTRUCTIONS FIRST DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number 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 provided. 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 16. The use of an approved scientific calculator is expected, where appropriate. _________________________________________________________________________ This document consists of 16 printed pages.

River Valley High School Pg 2 of 16 Sec 4 RVIP Chemistry End-of-Year Examination 2023 1 A scientist wants to collect a dry sample of an unknown gas, which turns moist blue litmus paper red. Which row shows the most suitable drying agent and collection method? drying agent collection method A calcium oxide gas syringe B concentrated sulfuric acid upward delivery C fused calcium chloride gas syringe D fused calcium chloride upward delivery 2 The diagram below shows an experimental set -up to collect the gas produced from the reaction between a metal carbonate and a dilute acid. Which row shows the reactant to be added first in the flask and the number of errors in the set-up? reactant to be added first to the flask number of errors A dilute acid 1 B metal carbonate 1 C dilute acid 2 D metal carbonate 2 dilute acid metal carbonate

River Valley High School Pg 3 of 16 Sec 4 RVIP Chemistry End-of-Year Examination 2023 3 A solution of food dyes in a soft drink was extracted for analysis by paper chromatography. Two drops of the solution were placed at the centre of the circular filter paper, labelled X, as shown in the diagram below. The filter paper was left to dry. Then, 10 drops of ethanol were slowly added to the centre of the filter paper and the chromatogram was left to develop. After some time, coloured circles were seen, as shown in the diagram below. From the results above, which of the following statements about the soft drink is true? A It contains only three different food dyes. B It contains some food dyes that are not soluble in ethanol. C It contains food dyes that are soluble in ethanol. D It is yellow in colour. X Filter paper Solvent front Orange Yellow Yellow Brown

River Valley High School Pg 4 of 16 Sec 4 RVIP Chemist