ASRJC 2021 J2Prelims H2Chem P1 QP

ASRJC JC2 PRELIMS 2021 9729/01/H2 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2021 JC 2 PRELIMINARY EXAMINATION NAME:______________________________ ( ) CLASS: 21 /____ CHEMISTRY 9729/01 Paper 1 Multiple Choice 22 September 2021 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 register number 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 this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 19 printed pages and 1 blank page. Multiple Choice Answer Sheet Write your name, class and NRIC / FIN number, including the reference letter. Shade the NRIC / FIN number. Exam Title: JC2 PRELIM Exam Details: H2 Chemistry / Paper 1 Date: 22/09/2021

2 ASRJC JC2 PRELIMS 2021 9729/01/H2 1 Two particles, A+ and B3+ are fired with equal velocity into an electric field. The information on two particles are given in the table below. particle number of electrons number of neutrons angle of deflection in an electric field A+ 10 12 2.0° B3+ ? 14 5.1° What is the number of electrons for B3+? A 10 B 11 C 12 D 13 2 A to H are consecutive elements with atomic numbers less than 20. The graph below shows their second ionisation energies (2nd I.E.). Which of the following statements is correct? A The 2nd I.E. of G is lower than that of F due to the inter–electronic repulsion between its paired s electrons. B C exists as diatomic molecules at room temperature. C The compound formed between A and E has a low melting point. D Element B is from Group 17. 0500100015002000250030003500400045005000 ABCDEFGH 2nd I.E. element

3 ASRJC JC2 PRELIMS 2021 9729/01/H2 [Turn over 3 The graph shows the logarithm of the first twelve ionisation energies (I.E.) for element J. What can be deduced about element J from the graph? 1 It can form a compound with oxygen with the formula J2O3. 2 J is likely to have a lower first I.E. than the element preceding it in the same period. 3 It is in the second period (Li to Ne) of the Periodic Table. 4 J has a half–filled p–subshell. A 1, 2 and 3 B 1, 2 and 4 C 1 and 2 only D 3 and 4 only 4 Acrylonitrile, CH2=CHCN is a monomer used to made polyacrylonitrile. Which row correctly describes the number of p bonds and hybridisation in a molecule of acrylonitrile? Number of π bonds Number