NYJC H2 Chem 2012 Prelim P1 QP

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 21 September 2012 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and tutor’s name on the Answer Sheet in the spaces provided unless this has been done for you. There are forty 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 you 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. This document consists of 20 printed pages and 0 blank page. [Turn over

2 H2 Chemistry 9647/01 NYJC J2/12 PX Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 The mass percentage of magnesium in a mixture of magnesium chloride and magnesium nitrate was found to be 21.25%. What mass of magnesium chloride is present in 100 g of the mixture? A 47 g B 51 g C 53 g D 56 g 2 The use of the Data Booklet is relevant to this question. The successive ionisation energies, in kJ mol –1 , of an element X are given below. 870 1800 3000 3600 5800 7000 13200 What is X? A 8O B 33 As C 52 Te D 53 I 3 Iodine and phosphorus each form a trifluoride. Wh at are the shapes of these two molecules? IF 3 PF 3 A trigonal planar trigonal pyramidal B T-shaped trigonal pyramidal C trigonal pyramidal trigonal planar D T-shaped trigonal planar

3 H2 Chemistry 9647/01 NYJC J2/12 PX [Turn over 4 Which of the following diagrams correctly describe s the behavior of a fixed mass of an ideal gas? ( T is measured in K.) A B C D constant T p V 0 0 constant p V T 0 constant T p ρ 0 constant T pV p

4 H2 Chemistry 9647/01 NYJC J2/12 PX Questions 5 and 6 refer to the “OXO” reaction shown below. The “OXO” reaction shown below is industrially impo rtant for making alcohols, aldehydes and carboxylic acids. For example, butan al can be synthesised from propene, C 3H6, according to the following scheme. It can then b e converted to butan-1-ol and butanoic acid. CH 3CH=CH 2(g) + CO(g) + H2(g) Ý CH 3CH 2CH 2CHO(g) propene butanal 5 The value of ∆ G for this reaction is negative. What is the sign of ∆ S and ∆ H for the above reaction? ∆ S ∆ H A + + B + − C − + D − − 6 Use of the Data Booklet is relevant to this question. Taking the bond energ