RI 2018 Prelim P1 QP

© Raffles Institution 2018 9729/01/S/18 [Turn Over RAFFLES INSTITUTION 2018 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 24 September 2018 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 thirty questions in this section. 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 the question booklet. This document consists of 18 printed pages.

© Raffles Institution 2018 9729/01/S/18 [Turn Over 2 For each question, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 A sample of iron contains three isotopes : iron-54, iron-56 and iron-58. Its relative atomic mass is 55.849. One of the isotopes has a percentage abundance of 91.8%. isotope accurate isotopic mass percentage abundance iron-54 53.94 x iron-56 55.94 y iron-58 57.93 z Which row gives the correct values of x, y and z? x y z A 91.8 6.37 1.83 B 1.83 91.8 6.37 C 6.37 91.8 1.83 D 1.83 6.37 91.8 2 S2Clx disproportionates completely in water to give S and SO2 in the ratio of 3:1. What is the value of x? A 2 C 6 B 4 D 8 3 Which ion would undergo the greatest deflection in an electric field? A 15N2+ C 12C16O2+ B 12C16O23+ D 16O18O2+

© Raffles Institution 2018 9729/01/S/18 [Turn Over 3 4 The radioactive isotope Am95 241 is a synthetic isotope used in ioni sation smoke detectors. Am95 241 decays to give an element E and emits a high energy 𝛼-particle (which is a helium nucleus, He2 4 ). No other particle is produced. Am95 241 → He2 4 + E Which row in the table correctly describes the nuclear make-up of element E? number of protons number of neutrons A 91 144 B 91 237 C 93 144 D 93 237 5 Which statement about both molecules shown below is correct? A Both can turn hot acidified potassium dichromate(VI) from orange to green. B G can form intramolecular hydrogen bonding while F cannot. C Both molecules have the same number of  electrons. D Both molecules are planar.

© Raffles Institution 2018 9729/01/S/18 [Turn Over 4 6 Which graph represents the correct behaviour for a fixed mass of an ideal gas? (Assume that all temperatures are measured in Kelvin.) A C B D

© Raffles Institu