TJC Prelim P1

TEMASEK JUNIOR COLLEGE CHEMISTRY 9746/01 Paper 1 Multiple Choice Tuesday 29th SEPTEMBER 2009 1 hour Additional materials: Data Booklet Multiple Choice Answer Sheet 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, index number and CG on the Answer Sheet in the spaces provided. There are forty questions on this paper. Answer all questions. For each question, there are four possible answers labelled 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. You may use a calculator. This document consists of 19 printed pages. [Turn over

2 TJC H2 Chemistry Paper 1 2009 [Turn over Section A For each question there are four possible answers, A, B, C and D . Choose the one you consider to be correct. 1 Given the following information: Hc (graphite) = -394 kJ mol-1 Hf (water) = -286 kJ mol-1 Hf (methanol) = -239 kJ mol-1 Which one of the following is the correct H c (methanol) in kJ mol-1? A -441 B -727 C -919 D -1205 2 In an experiment, 10 cm3 of an organic compound X in the gaseous state was sparked in excess oxygen. 20 cm 3 of carbon dioxide and 5 cm 3 of nitrogen were obtained among the products. All gas volumes were measured at the same temperature and pressure. Which of the following compounds could be X? A C 2H7N B C2H6N2 C C6H5NO2 D C3H5N

3 TJC H2 Chemistry Paper 1 2009 [Turn over 3 Ozone reacts with nitric oxide according to the equation: NO(g) + O3(g)  NO2(g) + O2(g) 0.66g of NO(g) was mixed with 0.72g of O 3(g). What is the maximum volume of NO2(g) produced at 0C and 100 kPa? A 0.34 dm3 B 0.37 dm3 C 0.45 dm3 D 0.50 dm3 4 Why is ethanoic acid a stronger acid in liquid ammonia than in aqueous solution? A Ammonia is a stronger base than water B Ammonium ethanoate is completely ionised in aqueous solution C Ammonium ethanoate is strongly acidic in aqueous solution D Liquid ammonia is a more polar solvent than water. 5 An acidified solution containing 0.10 mol dm -3 of zinc sulphate and 0.10 mol dm -3 of copper (II) sulphate is saturated with hydrogen sulphide at 15 oC. The concentration of S2- (aq) in the solution is then 10-35 mol dm-3. The solubility product of zinc sulphide at 15 oC is 10-24 mol2dm-6 and that of copper (II) sulphide is 10-40 mol2dm-6.