TJC Prelim P1

1 9729/01/TJC Prelim/2018 [Turn Over CHEMISTRY 9729/01 Paper 1 Multiple Choice 15th September 2018 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are thirty 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 13 printed pages. Write your name and Civics Group Write and shade your index number

2 9729/01/TJC Prelim/2018 [Turn Over Section A 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 (OMS). 1 Some isotopes are unstable and undergo nuclear (radioactive) reactions. In one type of reaction, an unstable nucleus assimilates an electron from an inner orbital of its electron cloud. The net effect is the conversion of a proton and an electron into a neutron. Which of the following describes this type of reaction? A 11C → 12C B 111I → 111Te C 76Br → 75Br D 76Kr → 75Br 2 Sodium hydrogencarbonate can be prepared from sodium sulfate by a three-step process: Na2SO4(s) + 4C(s) → Na2S(s) + 4CO(g) Na2S(s) + CaCO3(s) → CaS(s) + Na2CO3(s) Na2CO3(s) + H2O(l) + CO2(g) → 2NaHCO3(s) What is the mass of sodium hydrogencarbonate that could be formed from 100 kg of the sodium sulfate, assuming a 90% yield in each step? A 106 kg B 96 kg C 86 kg D 43 kg 3 Which of the following reactions is a redox reaction? A 2NO2 → N2O4 B 6HCl + As2O3 → 2AsCl3 + 3H2O C SbF3 + F2 → SbF5 D Cr2O72- + 2OH- 2CrO 42- + H2O

3 9729/01/TJC Prelim/2018 [Turn Over 4 When 2.6 g of a metal X are added to copper(II) sulfate solution 4.8 g of copper are obtained. The relative atomic mass of X is 52. Which one of the following cations of X is produced? A X4+ B X3+ C X2+ D X+ 5 20.0 cm3 of 0.02 mol dm−3 bromate(V), BrO3−, was found to react completely w