JPJC H2 Chemistry P1 QP Prelim

¤ Jurong Pioneer Junior College [Turn Over NAME CLASS 20S JURONG PIONEER JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION 2021 CHEMISTRY 9729/01 Higher 2 Paper 1 Multiple Choice 24 September 2021 1 hour Candidates answer on separate paper. 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 exam index number 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 or 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.

2 ¤ Jurong Pioneer Junior College 9729/01/J2 PRELIMINARY EXAM/2021 1 Some isotopes are unstable and undergo nuclear (radioactive) reactions. In one type of reaction, an unstable nucleus assimilates an electron from an inner orbital of its electron cloud. The net effect is the conversion of a proton and an electron into a neutron. Which of the following describes this type of reaction? A 11C o 12C B 111I o 111Te C 76Br o 75Br D 76Kr o 75Br 2 Figure 1 shows the first six ionisation energies of an element P. Figure 2 shows the second ionisation energies of eight consecutive elements (including P). Figure 1 Figure 2 With reference to Figure 2, which of the options, A, B, C or D, corresponds to the second ionisation energy of element P? 3 Which of the following has the largest bond angle? A SiCl4 B SO2 C IF2— D CH3+ Ionization Energy/ kJ mol-1 Electron removed 1 2 3 4 5 6 Second Ionization Energy/ kJ mol-1 Atomic number A B C D

3 ¤ Jurong Pioneer Junior College 9729/01/J2 PRELIMINARY EXAM/2021 [Turn Over 4 Molecular dimerisation can be described as the process in which two identical molecules combine to give a single product. Examples of dimers are N2O4 and (CH3CO2H)2. Which of the following descriptions about the above dimers is incorrect? A Hydrogen bonds hold the CH3CO2H molecules together in the dimer. B There is one nitrogen-nitrogen single bond in N2O4. C (CH3CO2H)2 is a non-planar molecule. D The nitrogen-oxygen bonds in N2O4 are of different length. 5 Naturally-occurring silicon is a mixture of three isotopes, 28Si, 29Si and 30Si. The relative atomic mass of silicon is 28.109. What could be the relative abundance