NYJC_H1 Chem Prelim 08 P1

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8872/01 Paper 1 Multiple Choice 17 September 2008 50 minutes 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 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. This document consists of 13 printed pages. [Turn over

2 Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 In an attempt to establish the formula of an oxide of nitrogen, a known volume of the pure gas was mixed with hydrogen and pass ed over a catalyst at a suitable temperature. 100% conversion of the ox ide to ammonia and water was shown to have taken place. N xOy xNH3 + yH2O H2(g) 2400 cm 3 of nitrogen oxide, measured at room temperature and pressure, produced 7.20 g of water. The ammonia produced was neutralised by 200 cm3 of 1.0 mol dm−3 of HCl. What is the oxidation number of the nitrogen in the nitrogen oxide? A +1 B +2 C +3 D +4 2 Which one of the following ions has more electrons than protons, and more protons than neutrons? [D= ] H2 1 A D − B He + C OH − D D 3O+ 3 For which of the following does the 2 nd compound has a higher boiling point than the 1st compound? A pentane and butanone B propene and ethene C 4-nitrophenol and 2-nitrophenol D pentane and 2,2-dimethylpropane H1 Chemistry 8872/01 NYJC J2/08 PX

3 4 Which molecule has the largest dipole? A B C D OC CH3 CH3 CC Cl CH3 H3C Cl CC CH3 CH3 H H OC Cl Cl 5 The enthalpy change when solid sodium hydroxide dissolves in water is − 44.4 kJ mol−1. 250 g of water is placed in a coffee-cup calorimeter containing 13.9 g of solid NaOH. If the solution has the same specific heat c apacity as liquid water, what is the rise in temperature of the solution? A 18 4 250 4 44 9 13 . . . × × K B 310 4 44 9 13 18 4 250 × × × . . . K C ×× ×× 313.9 44.4 10 40 250 4.18 K D 18 4 9 263 10 4 44 9 133 . . . . × × × K 6 Given the following data and energy cycle, what is the enthalpy change for the following reaction? IF5(g) → IF3(g) + F2(g) IF(g) + F 2(g) → IF3(g); ∆H = −390 kJ mol−1 IF(g) + 2F 2(g) → IF5(g); ∆H = −745 kJ mol−1 IF5(g) IF3(g) + F2(g) IF(g) + 2F2(g) A −355 B +355 C −1135 D +1135 H1 Chemistry 8872/01 NYJC J2/08 PX

4 7 The reacti