2022 RVHS JC2 H2 CM Prelim P4 (QP)

RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATION H2 CHEMISTRY 9729 Paper 4 19 AUGUST 2022 2 HOURS 30 MINUTES NAME CLASS 21J ( ) INDEX NO. INSTRUCTIONS TO CANDIDATES DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. Read these notes carefully. Write your name, class and index number in the spaces at the top of this page. Give details of the practical shift and laboratory where appropriate, in the boxes provided. Write in dark blue or black pen. You may use a 2B pencil for any diagram or graph. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Shift Laboratory For Examiner’s Use s.f. Units Total 55 _______________________________________________________________________________ This Question Paper consists of 19 printed pages and 1 blank page.

River Valley High School Pg 2 of 20 JC 2 H2 Chemistry 9729 2022 Preliminary Examination Paper 4 Answer all the questions in the spaces provided. 1 Investigation of the oxidising ability of substances FA 1 is an aqueous solution of iron(II) sulfate. FA 2 is made by dissolving 0.750 g of KMnO 4 in deionised water and made up to 250 cm3 in a volumetric flask. FA 3 is 0.500 mol dm−3 compound A. FA 4 is 1 mol dm−3 sulfuric acid. You will perform tests to: • investigate the oxidising ability of three substances • carry out a titration to determine the concentration of iron(II) sulfate in FA 1. (a) (i) Carry out the following tests. Carefully record your observations in Table 1.1. The volumes given below are approximate and should be estimated rather than measured. In this section, there is only one gas evolved. You only need to carry out the identification test and identify the gas once. Table 1.1 Test Observations 1 To a 1 cm depth of FA 1 in a test-tube, add 1 cm depth of FA 4 , then gradually add FA 2 till 1 drop in excess. 2 To a 1 cm depth of FA 3 in a test-tube, add 1 cm depth of FA 2. 3 To a 1 cm depth of FA 1 in a test-tube, add about 1 cm depth of FA 4, followed by 1 cm depth of FA 3. To a portion of resulting solution, add aqueous sodium hydroxide till excess. 1 2 3

River Valley High School Pg 3 of 20 JC 2 H2 Chemistry 9729 2022 Preliminary Examination Paper 4 (ii) Explain the chemistry involved for all the observations in Test 1. 4 (iii) Write two equations to show the changes to Fe2+ ions in Test 3. 5 6 (iv) Using the results in Test 3, state the stronger oxidising agent. 7

River Valley High School Pg 4 of 20 JC 2 H2 Chemistry 9729 2022 Preliminary Examination Paper 4 (b) (i) Titration of FA