ASRJC 2022 J2 H2Prelim P1 QP

ASRJC JC2 PRELIMS 2022 9729/01/H2 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2022 JC 2 PRELIMINARY EXAMINATION NAME:______________________________ ( ) CLASS: 22 /____ CHEMISTRY 9729/01 Paper 1 Multiple Choice 21 September 2022 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 16 printed pages. 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: 21/09/2022

2 ASRJC JC2 PRELIMS 2022 9729/01/H2 1 In two separate experiments, a beam of protons and electrons, travelling at the same velocity is passed through an electric field as shown. Which statement is correct? A The proton beam is deflected in a parabolic path to a larger extent than the electron beam. B The proton beam travels in a straight path towards the negatively charged plate. C The electron beam travels in a straight path towards the negatively charged plate. . D The proton beam is deflected in a parabolic path towards the negatively charged plate. 2 Use of the Data Booklet is relevant to this question. The table below shows the fifth, sixth, seventh, eighth and ninth ionisation energies of an element D (Z ≤ 20) in the Periodic Table. 5th 6th 7th 8th 9th ionisation energy / kJ mol–1 6530 9353 11 019 33 606 38 676 What can be inferred about the element from the above data? A It is in the second period of the Periodic Table. B It has a valence electronic configuration of ns2np4. C Its 5th and 6th electrons are removed from different subshells. D It is likely to form an ionic compound Mg3D2 with magnesium. Beam of particles + – Source

3 ASRJC JC2 PRELIMS 2022 9729/01/H2 [Turn over 3 Which pair of molecules have a greater permanent dipole in molecule I than in molecule II? I II 1 CH3CHCl2 CH3CH2Cl 2 C C Cl H3C CH3 Cl C C Cl H3C Cl CH3 3 C C Cl Cl CH3 CH3 C C Cl H3C CH3 Cl 4 C C F H3C F CH3 C C Cl H3C Cl CH3 A 1 and 2 only B 3 and 4 only C 2, 3 and 4 only D 1, 3 and 4 only 4 Four substances have the physical properties as shown. Compound Melting point/°C Electrical conductivity of solid Electrical conductivity of molten substance E -72 poor poor F 801 poor good G 842 good good H 1710 poor poor Which of the following shows the correct type of structures for each compound? E F G H A simple molecular structure giant ionic structure giant metallic structure giant molecular structure B giant molecular structure giant metallic structure giant ionic structure giant molecular structure C giant molecular structure simple molecular structure giant metallic structure giant ionic structure D simple molecular structure giant ionic structure giant molecular structure giant metallic structure

4 ASRJC JC2 PRELIMS 2022 9729/01/H2 5 The value of pV RT is plotted against p for one mole of each of the two gases, J and K, where p is the pressure, V is the volume and T is the temperature of the gas. Which of the following statements is true about gases J and K? A Gas J is N 2 and gas K is O 2 because there is stronger instantaneous dipole -induced dipole interactions between N2 molecules than O2. B Gas J is HBr and gas K is HI because there is stronger instantaneous dipole -induced dipole interactions between HI molecules than HBr. C Gas J is HBr and gas K is H2O because there is stronger permanent dipole -permanent dipole interactions between HBr molecules than the weaker instantaneous dipole - induced dipole interactions between H2O molecules. D Gas J is HBr and gas K is F 2 because there is stronger permanent dipole -permanent dipole interactions between HBr molecules than the weaker instantaneous dipole - induced dipole interactions between F2 molecules. pV RT 1.0 p J K

5 ASRJC JC2 PRELIMS 2022 9729/01/H2 [Turn over 6 Use of Data Booklet is relevant to this question. At 800 K, the following compounds all behave as ideal gases. NH3 CH3Cl CH2Cl2 HCOOH Which of the following diagram is correct for a given mass of e ach of these gases at constant pressure? A B C D 7 Use of Data Booklet is relevant to this question. What is the correct order of the lattice energies of magnesium oxide, magnesium chloride and sodium chloride, starting with the highest numerical value? A MgO > NaCl > MgCl2 B MgO > MgCl2 > NaCl C MgCl2 > MgO > NaCl D MgCl2 > NaCl > MgO volume NH3 CH3Cl CH2Cl2 HCO2H x x x x volume NH3 CH3Cl CH2Cl2 HCO2H x x x x volume NH3 CH3Cl CH2Cl2 HCO2H x x x x volume NH3 CH3Cl CH2Cl2 HCO2H x x x x

6 ASRJC JC2 PRELIMS 2022 9729/01/H2 8 Which quantity would best indicate the relative strengths of the intermolecular forces of attraction between the molecules in liquid hydrogen halides? A Bond dissociation energies B Enthalpy changes of vapourisation C Enthalpy changes of formation D Enthalpy changes of atomisation 9 Sucrose undergoes an acid–catalysed hydrolysis according to the following equation. C12H22O11 + H2O C6H12O6 + C6H12O6 sucrose glucose fructose The following results were obtained using hydrochloric acid as the catalyst. experiment initial [HCl] / mol dm–3 initial [sucrose] / mol dm–3 initial rate / mol dm–3 s–1 I 0.10 0.10 0.024 II 0.10 0.15 0.036 III 0.30 0.10 0.072 The half–life of sucrose in experiment I was 3.0 s. What is the half–life of sucrose in experiment II and in experiment III? experiment II experiment III A 3.0 3.0 B 3.0 1.0 C 2.0 1.0 D 2.0 3.0

7 ASRJC JC2 PRELIMS 2022 9729/01/H2 [Turn over 10 Which suggested mechanism is consistent with the experimentally obtained rate equation? rate equation suggested mechanism 1 rate = k1 [H2O2] [I–] H2O2 + I- H2O + OI-slow OI- + H+ fast HOI HOI + H+ + I- fast I2 + H2O 2 rate = k2 [H2] [I2] H2 2Hslow 2H + I2 fast 2HI 3 rate = k3 [HBr]2 [O2]½ 2HBr + O2 2HBrOfast HBrO + HBr slow H2O + Br2 A 1 and 2 only B 1 only C 1 and 3 only D 2 and 3 only 11 In the presence of gold wire as a catalyst, 25.0 kPa of dinitrogen oxide, N2O, decomposes in a closed container according to the equation below. 2N2O(g) → 2N2(g) + O2(g) The units of the rate constant was found to be s–1. Which of the following remains constant during the experiment? A The rate of the reaction. B The total pressure of the reaction mixture. C The value of rate constant in the absence of gold. D The time taken for the pressure of N2O to drop by half.

8 ASRJC JC2 PRELIMS 2022 9729/01/H2 12 The rates of the reversibl