2019 NYJC Prelim P1 QP

[Turn Over This document consists of 19 printed pages. NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 23 September 2019 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, CT and NRIC / FIN on the Answer Sheet in the spaces provided. 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 booklet. The use of an approved scientific calculator is expected, where appropriate.

2 H2 Chemistry 9729/01 NYJC J2/2019 PRELIM 1 4th July 2012, the discovery of th e Higgs boson validated the Standard Model of elementary particles, a widely accepted framework for understanding sub-atomic particles. In the Standard Model, nucleons can be further divided into more basic particles, called quarks. Quarks occupy spaces and have charges; some positive, some negative. The following table list the characteristics of some sub-atomic particles in the Standard Model. Type of particle Symbol Size and polarity of electronic charge, e Up quark u +⅔ Down quark d –⅓ electron e –1 neutrino ve 0 In a radioactive reaction, the following process occurs in the nucleus of an atom. nucleon A nucleon B Which of the following statements are correct? 1 The charge of nucleon B is +1. 2 Particle C is deflected towards the positive plate in an electric field. 3 The process can be described by 22Ne → 22Na. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only 2 An oxygen candle is used to provide an emergency supply of oxygen in spacecraft. It contains sodium chlorate in a chemical mixture. When ignited, the mixture burns at 600 °C. At this temperature, thermal decomposition of the sodium chlorate occurs, releasing oxygen gas and forming sodium chloride as the only products. When sodium chlorate decomposes, 0.150 moles of oxygen gas and 0.100 mole of sodium chloride are formed. What is the oxidation state of chlorine in the chlorate? A +3 B +5 C +6 D +11 u d d u u d + particle C + ve

3 H2 Chemistry 9729/01 NYJC J2/2019 PRELIM [Turn Over 3 Cations with a high charge density can polaris e adjacent anions. This results in ionic bonds with covalent character. However, if the oxidation state is high enough, a covalent bond will form instead. Which of the following correctly lists the most ionic and the most covalent halide compounds? Most i