PJC 2015_H1_CHEM_P1_QP_ANS Prelims

PIONEER JUNIOR COLLEGE 2015 JC2 PRELIMINARY EXAMINATION HIGHER 1 CHEMISTRY 8872/01 Paper 1 25 September 2015 Additional Materials: Data Booklet Multiple Choice Answer Sheet 50 minutes READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name and index number on the Answer Sheet in th e spaces provided unless this has been done for you. 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 penci l 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. This document consists of 13 printed pages Name: Index No.: CT Group: 14

2 Section A For each question, there are four possible answers labelled A, B, C and D. Choose the one you consider to be correct. 1 Which of the following has the greatest mass? A 6 x 1023 molecules of hydrogen gas B 3 moles of nitrogen molecules C 1.2 x 1024 iron atoms D 3 x 1023 copper(II) ions 2 A sample of 10 dm 3 of polluted air, measured at room temperature and pressure, is passed through limewater so that all the carbon dioxide present is precipitated as calcium carbonate. The mass of calcium carbonate formed is 0.05 g. What is the percentage, by volume, of carbon dioxide in the air sample? [Ar of C, 12.0; O, 16.0; Ca, 40.1] A 0.03 % B 0.05 % C 0.12 % D 0.6 % 3 Gaseous particle B has a proton number n and a charge of +1. Gaseous particle C has a proton number of (n+1) and is isoelectronic with B. B and C have the same number of neutrons. Which of the following statements incorrectly describes B and C? A The charge of B is half that of C. B B has a larger ionic radius than C. C B requires less energy than C when a further electron is removed from each particle. D B has a higher charge density than C. 4 Which of the following molecules/ions has the smallest bond angle? A AlH4‾ B SO3 2‾ C XeF2 D SF2

3 5 Blu-Tack is a reusable adhesive that consists of a synthetic long chain hydrocarbon, and it is able to stick on to many surfaces, such as ceramic tiles and glass. What is the likely attraction between Blu-Tack and glass surfaces? A van der Waal’s forces B covalent bond C hydrogen bond D ionic bond 6 The table shows the enthalpy change of neutralisation, H, for the various a cids and bases. acid base H / kJ mol–1 sulfuric acid sodium hydroxide –57.0 P sodium hydroxide Less exothermic than –57.0 sulfuric acid Q Less exothermic than –57.0 R potassium hydro