CJC_H1_CHEM_P1 Prelim

CATHOLIC JUNIOR COLLEGE CHEMISTRY 8872/01 Higher 1 Paper 1 Multiple Choice JC 2 Preliminary Examination 2009 50 minutes Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use paper clips, highlighters, glue or correction fluid. Write and shade your name, class and NRIC / FIN on the Answer Sheet. There are thirty questions in 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 question paper. You may use a calculator. There are a total of 8 printed pages including this cover page.

2 8872/01/CJC JC 2 Prelim 09 Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 Chlorine is a pungent gas which causes severe irrit ation to the eyes and respiratory system. The maximum safe tolerance level of chlorine gas in air is 0.005 mg dm -3. How many chlorine molecules are there in 1 dm 3 of air at this tolerance level? A . 71 10 6 005 0 23 ×× B 23 10 671 005 0 ××. C 23 10 671 1 1000 0.005 ××× D 23 10 671 1000 0.005 ××× 2 The principal ingredient listed for chocolate bars is sugars, typically about 47% of milk chocolate bars. If these sugars are represente d by sucrose, C 12 H22 O11 (M r = 342), how many moles of sugar are there in 1 kg of chocolate bars? A 1.37 B 1.54 C 2.92 D 4.30 3 In an experiment, 25.0 cm 3 of 0.020 mol dm -3 KMnO 4(aq) were found to absorb and react with 12.0 cm 3 of nitrogen monoxide, NO, at room temperature and pressure. The half equation representing the reaction of KMnO4(aq) is: MnO 4 - + 4H + + 3e - /barb2right MnO 2 + 2H 2O Which one of the following is a possible nitrogen-containing product of this reaction? A NO 2 - B N2O4 C NO 3 - D NH 3OH + 4 Carbon-14 is radioactive and is used by archaelogi sts in carbon dating. Which