CJC_Prelim H2 Chem 2008 P1

CATHOLIC JUNIOR COLLEGE PRELIMINARY EXAM 2008 CHEMISTRY 9746/01 CHEMISTRY 9746/01 Higher 2 Higher 2 Paper 1 Multiple Choice 11 September 2008 Paper 1 Multiple Choice 11 September 2008 1 hour 1 hour Additional Materials: Mult iple Choice Answer Sheet Additional Materials: Mult iple Choice Answer Sheet Soft clean eraser Soft clean eraser Soft pencil Soft pencil Data Booklet Data Booklet READ THESE INSTRUCTIONS FIRST READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write in soft pencil. Write your name, class and NRIC number on the Multiple Choice Answer Sheet in the spaces provided unless this has been done for you. Write your name, class and NRIC number on the Multiple Choice Answer Sheet in the spaces provided unless this has been done for you. There are forty questions in this paper. Answer all questions. For each question, there are four possible answers A, B, C and D. There are forty 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. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Multiple Choice Answer Sheet very carefully. Read the instructions on the Multiple Choice Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. 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. Any rough working should be done in this booklet. This document consists of 11This document consists of 11 printed pages and 1 blank page.

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 Which of the following expression correctly defines the term relative atomic mass of an element? A The mass of one atom of an element relative to the mass of one atom of 12C. B The mass of one mole of atoms of an el ement relative to the mass of one atom of 12C. C The mass of one mole of atoms of an el ement relative to the mass of one mole of 12C atoms. D The mass of one mole of atoms of an element divided by Avogadro’s constant. 2 How many atoms are there in 500 cm3 of carbon dioxide under room conditions? A 1.25 × 1022 B 1.34 × 1022 C 3.76 × 1022 D 9.0 × 1026 3 When 10 cm 3 of a gaseous hydrocarbon X were burned in 70 cm 3 of oxygen, the final gaseous mixture contained 30 cm 3 of carbon dioxide and 20 cm 3 of unreacted oxygen. [All gaseous volumes measured under identical conditions.] What is the formula of hydrocarbon X? A C 2H6 B C 3H6 C C 3H8 D C 4H10 4 20.0 cm 3 of 0.02 mol dm −3 bromate(V), BrO 3 −, was found to react completely with 80.