JPJC 9729 Prelim P1

© Jurong Pioneer Junior College [Turn Over NAME CLASS 22S JURONG PIONEER JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION 2023 CHEMISTRY 9729/01 Higher 2 Paper 1 Multiple Choice Questions 19 September 2023 1 hour Candidates answer on the Question 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 12 printed pages.

2 © Jurong Pioneer Junior College 9729/01/J2 PRELIM EXAM/2023 1 Element X has eight more protons than element Y. Which statement must be correct? A Atoms of element Y are larger than atoms of element X. B Element X has at least one fully filled shell of electrons. C Element X and element Y are in the same group. D Element X and element Y are in the same period. 2 Molecular dimerisation can be described as the process in which two identical molecules combine to give a single product. Examples of dimers are: Al2Cl6 and (CH3CH2CO2H)2. Which statement about the above dimers is incorrect? A Two hydrogen bonds hold the CH3CH2CO2H molecules together in the dimer. B Each aluminium atom is surrounded by four chlorine atoms in the dimer, Al2Cl6. C CH3CH2CO2H exists as dimers when dissolved in water. D Al2Cl6 dimers are non-polar molecules. 3 Which statement is correct? A Cl has a relative isotopic mass of 35.5. B Cl2 has a relative molecular mass of 70. C ICl has a relative molecular mass of 162.4. D NaCl has a relative molecular mass of 58.5. 4 Use of the Data Booklet is relevant to this question. The most common scuba diving gas tank typically comprises 11.7% of helium gas, 56.2% of nitrogen gas and 32.1% of oxygen gas by volume. What is the mass of oxygen gas inside the diving gas tank of 0.018 m3 and 300 bar at 293K? A 1.14 kg B 2.28 kg C 7.10 kg D 7100 kg

3 © Jurong Pioneer Junior College 9729/01/J2 PRELIM EXAM/2023 [Turn Over 5 The following graph shows the behaviour of an ideal gas with fixed mass. Which of following will yield the graph above? X-axis Y-axis condition A p in Pa pV in Pa m3 constant temperature B p in Pa ρ (density) in g m−3 constant te