2022 TJC Prelims H2 Paper 1 MCQ QP

9729 / TJC Prelims / 2022 [Turn over TEMASEK JUNIOR COLLEGE 2022 JC2 PRELIMINARY EXAMINATION Higher 2 Chemistry 9729/01 Paper 1 Multiple Choice 16 September 2022 1 hour Additional Materials: Multiple Choice Answer Sheet (OMS) Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are thirty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C, D. Choose the one you consider correct and record your choice in soft pencil on the separate OMS. Read the instructions on the OMS very carefully. Write your name & Civics Group on the OMS. Shade your index number in the appropriate boxes. 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. Write your name and Civics Group Index number (refer to entry proof)

2 9729 / TJC Prelims / 2022 1 Use of the Data Booklet is relevant to this question. Atoms or ions that contain the same number of neutrons are isotonic. Which of the following pairs of ions fulfil both criteria below? • The two ions are isotonic. • The first ion deflects more than the second ion when passed through an electric field. A 35Cl–, 31P– B 31P–, 31P3– C 31P3–, 32P2– D 31P3–, 32S2– 2 The variation in the third ionisation energy of six consecutive elements in the Periodic Table is shown in the graph. Which of these elements is a Group 15 element? proton number 3rd ionisation energy / kJ mol−1 A B C D

3 9729 / TJC Prelims / 2022 [Turn over 3 Which group of particles is in order of increasing first ionisation energy? 1 Ga Ge As 2 As Se Br 3 Se Br Kr 4 P As Sb A 1 and 3 B 2 and 4 C 2 and 3 D 1 and 4 4 Carbon forms double bonds with oxygen, and with two other Group 16 elements, Y and Z. In the molecules CO 2, COY and COZ, the polarities of these double bonds do not necessarily cancel. overall polarity of molecule CO2 0 COY 0.71 COZ 0.73 Which factor best accounts for these observations? A The C=O bond is the least polar, while the C=Z bond is the most polar. B Electronegativity increases in the order: Z < Y < O C The C=O, C=Y and C=Z bonds are all polar. D Bond length increases in the order: C=O < C=Y < C=Z 5 Which of the following best describes the change in bond angle when SO2 is converted to SO3? A Decreases to 107o B Increases to 107o C Decreases to 120o D Increases to 120o

4 9729 / TJC Prelims / 2022 6 Which graph correctly describes the behaviour of fixed masses of the ideal gases L and M where the number of moles of L is greater than number of moles of M?