RI H2 Chem 2013 Prelim P1 QP

© Raffles Institution 2013 9647/01/S/13 [Turn Over RAFFLES INSTITUTION 2013 YEAR 6 PRELIMINARY EXAMINATION HIGHER 2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 27 September 2013 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. 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 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 23 printed pages. 157

2 © Raffles Institution 2013 9647/01/S/13 [Turn Over 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 expression correctly defines the term relative atomic mass of an element? A the mass of 1 mole of atoms of an element divided by 6.02 × 1023 B the mass of 1 atom of an element relative to the mass of of a 12C atom C the average mass of 1 atom of an element relative to the mass of of a 12C atom D the average mass of 1 mole of atoms of an element relative to the mass of a 12C atom 2 Use of the Data Booklet is relevant to this question. Potassium manganate( VII), KMnO 4, reacts with sodium cyanide, NaCN, in a molar ratio of 2:3 to form manganese(IV) oxide, MnO2. Which of the following would be the carbon-containing product in this reaction? A B C D 3 For which of the following pairs does species I have a smaller bond angle than species II? I II A NO3 – NO2 – B SF6 ClF3 C XeF4 BrF5 D BrO3 – ClO3 – 158

3 © Raffles Institution 2013 9647/01/S/13 [Turn Over 4 To produce decaffeinated coffee, pure liquid CO 2 is sometimes used to extract caffeine from coffee beans. caffeine It was discovered that the solubility of caffeine greatly increased when a mixture of ethanol and liquid CO2 (ethanolCO2 mixture) was used. Which interaction best explains why caffeine is more soluble in the ethanol CO2 mixture as compared to liqu