MJC_H1_CHEM_P1 Prelim

No part of this paper should be repro duced for commercial use without the prior written permission of Meridian Junior College. Name _______________________ Class: _______ Reg Number: _____ Meridian Junior College 2009 JC2 Preliminary Examination H1 Chemistry 8872 ©chemistry department@meridian jc [Turn over 24 September 2009 50 minutes Paper 1 Additional Material Data Booklet OMR Answer Sheet INSTRUCTION TO CANDIDATES Write your name, class and regi ster number in the spaces pr ovided at the top of this page. There are thirty questions in this section. Answer all questions. For each question, there are four possi ble answers labelled A, B, C and D. Choose the one you consider correct and record your choice in pencil on the OMR Answer Sheet. You are advised to fill in the OMR Answer Sheet as you go along; no additional time will be given for the transfer of answers once the examination has ended. Use of OMR Answer Sheet Ensure you have written your name, class register number and class on the OMR Answer Sheet. Use a 2B pencil to shade your answers on the OMR sheet; erase any mistakes cleanly. Multiple shaded answers to a question will not be accepted. For shading of class register number on the OMR sheet , please follow the given examples: If your register number is 1, then shade 01 in the index number column. If your register number is 21, then shade 21 in the index number column. This question paper consists of Pages 1 to 15.

Section A For each question, there are f our possible answers labelled A, B, C and D. Choose the one you consider to be correct. 1 Which of the following contains 4.52 × 1021 atoms? A 0.113 g of methyl free radicals, (•CH3) B 0.0319 g of ammonia C 168 cm3 of oxygen gas at standard temperature and pressure D 1.80 dm3 of chlorine gas at room temperature and pressure 2 Sodium peroxide, Na 2O2, is used in submarines for absorbing atmospheric carbon dioxide and regenerating oxygen . The reaction produces sodium carbonate as a by-product. What is the mass of Na 2O2 needed per day to absor b the carbon dioxide produced by 8 crew members in a submarine, each of whom exhales 600 dm3 of CO2 per day? [Molar volume of a gas at r.t.p. is 24 dm3 mol-1] A 0.98 kg B 1.95 kg C 7.80 kg D 15.6 kg ©chemistry department@meridian jc [Turn over 1

3 Nitrogen oxides are a major type of air pollutants. In a reaction, 0.20 mol of an oxide, N xOy was reacted with 20 dm 3 of hydrogen gas at room temperature and pressure and passed over a heated catalyst to produce ammonia and water as the only products. At the end of the reaction, 0.80 dm 3 of hydrogen gas remained. The ammonia produced requi red 0.200 mol of sulphuric acid for complete neutralisation. The reaction of the oxide with hy drogen can be represente