RI Prelim P1 (Qns)

© Raffles Institution 2020 9729/01/S/20 [Turn Over RAFFLES INSTITUTION 2020 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 24 September 2020 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, glue or correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. There are thirty 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 the question booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages.

© Raffles Institution 2020 9729/01/S/20 [Turn Over 2 1 A sample containing four isotopes of xenon has a relative atomic mass of 131. 31. The percentage abundances of the isotopes in the sample are shown below. What is the value of m? isotope mXe 131Xe 132Xe 134Xe percentage abundance 28.0 25.0 27.0 20.0 A 126 C 129 B 128 D 130 2 5 moles of halide ion, X −, can react with 1 mole of halate ion, XO n−, to form a single halogen-containing product. Which row shows the value of n and the identity of the halogen-containing product? n halogen-containing product A 1 X2 B 2 XO− C 3 X2 D 4 XO− 3 At 298 K, two vessels are connected by a stopcock. The 5 dm 3 vessel is filled with argon at a pressure of 150 kPa and the 10 dm3 vessel is filled with xenon at 350 kPa. The stopcock is then opened to allow the gases to mix at 298 K , resulting in a total pressure of P kPa. Subsequently, the two vessels are heated to a temperature of T K and the total pressure at T K is 600 kPa. Assuming that the gases do not react at all temperatures, what are the values of P and T? P T A 217 437 B 217 824 C 283 570 D 283 632

© Raffles Institution 2020 9729/01/S/20 [Turn Over 3 4 Use of the Data Booklet is relevant to this question. In a nuclear reaction, uranium-235 decays as shown below. 235U  96Rb + 135Cs + 4X What is X? A neutron C electron B proton D hydrogen-1 5 Oxides of elements Mg, Al, Si and P are separately added to water and the pH of their resultant mixtures are measured. Which graph shows the correct trends when the melting points of these elements are plotted against the pH of the resultant mixtures? A B C D

© Raffles Institution 2020 9729/01/S/20 [Turn Over 4 6 The graph below shows