NYJC H2 Chem 2013 Prelim P1 QP

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 23 Sep 2013 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 19 printed pages. [Turn over 3

2 H2 Chemistry 9647/01 NYJC J2/2013 Prelim Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 A 15 cm 3 mixture of carbon monoxide and methane was mixed with excess oxygen and exploded. There was a c ontraction in volume of 15 cm 3 at room temperature and pressure. What is the percentage by volume of methane in the mixture? A 33 B 50 C 60 D 75 2 Nitrogen is essential in plant s for the synthesis of pr oteins and nuclei acids. A farmer intends to switch his nitrogen fertiliser from potassium nitrate to urea. Currently, he uses 300 kg of potassium nitrate per month. Given the following information about the two fertilisers, calculate his monthly savings (to the nearest dollar) if he switches to urea as a fertiliser. Fertiliser Potassium nitrate Urea Chemical Formula KNO3 CO(NH 2)2 Mr 101.1 60.0 Cost / tonne [1 tonne = 1000 kg] $850 $340 A $310 B $225 C $195 D $153 4

3 H2 Chemistry 9647/01 NYJC J2/2013 Prelim [Turn over + – R S T 3 The following are flight paths of charged particles when accelerated in an electric field. Which of the following are correct positions for the particles? R S T A 16O+ 14C+ 14N+ B 15O⎯ 14C+ 28Si+ C 14N⎯ 15O+ 28Si2+ D 14N⎯ 14C+ 28Si4+ 4 Consider the following reac tion of aluminium chloride: AlCl3 + Cl– ⇌ [AlCl4]– Which of the following is correct regarding AlCl3 and [AlCl4]–? A Both AlCl3 and [AlCl4]– are tetrahedral in shape. B A lCl3 is tetrahedral in shape and [AlCl4]– is planar in shape. C The C l–Al–Cl bond angle in AlCl3 is larger than that in [AlCl4]–. D There are more electron pairs around the A l atom in A lCl3 than that in [AlCl4]–. 5

4 H2 Chemistry 9647/01 NYJC J2/2013 Prelim 5 The graph of P / kPa against (1 / V) / m –3 was obtained for 0.400 g of an unknown gas at 25 C. What is the relative molecular mass of the gas? A 19.3 B 21.0 C 28.0 D 47.1 6 In a calorimetric experiment