NYJC 2020 Prelim 9729 P1

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 18 September 2020 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, class and tutor’s name on the Answer Sheet in the spaces provided unless this has been done for you. 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 this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages and 0 blank page. [Turn over

2 H2 Chemistry 9729/01 NYJC J2/20 PX 1 Use of the Data Booklet is relevant to this question. A typical solid fertiliser for use with household plants and shrubs contains the elements N, P and K in the ratio of 15 g : 30 g : 15 g per 100 g of fertiliser. The recommended usage of fertiliser is 14 g of fertiliser per 5 dm3 of water. What is the concentration of nitrogen atoms in this solution? A 0.015 mol dm–3 B 0.030 mol dm–3 C 0.075 mol dm–3 D 0.149 mol dm–3 2 Beams of charged particles are deflected by an electric field. In an experiment, protons are deflected by an angle of +15 o. In another experiment under identical conditions, particle Y is deflected by an angle of +5 o. What could be the composition of particle Y? no. of protons no. of neutrons no. of electrons A 1 2 1 B 3 3 5 C 4 5 1 D 4 5 3 3 In which pair do the species have different shapes from each other? A BeCl2 and CO2 B BH4– and NH4+ C OF2 and SCl2 D PH3 and SO3

3 H2 Chemistry 9729/01 NYJC J2/20 PX [Turn over 4 Liquids X and Y do not react with one another. They have identical boiling points. When a particular v olume of X is shaken with a similar volume of Y, they form a liquid mixture Z. The average intermolecular forces in liquid Z are stronger than the average of the forces in X and the forces in Y. Which deductions from this information are correct? 1 The mixing of X and Y is exothermic. 2 The vapour pressure of liquid Z will be less than that of either liquid X or liquid Y at the same temperature. 3 The boiling point of liquid Z will be lower than that of either liquid X or liquid Y at the same pressure. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only 5 Which graph correctly describes the behaviour of two ideal gases P and Q, both having the same mass, where P has a larger Mr than Q? A B C D T / oC p Q P T / oC p Q P p V pV constant T Q P