YJC H2 CHEM P1 With Answer

YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION 2014 CHEMISTRY 9647/01 HIGHER 2 Paper 1 Multiple Choice 1 hour Additional materials: Multiple Choice Answer Sheet and Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name and CTG on the Answer Sheet. Shade your NRIC/FIN number in the space provided on the Answer Sheet. There are forty 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 d educted for a wrong answer. Any rough working should be done in this booklet. This question paper consists of 17 printed pages.

9647 / YJC / 2014 / JC2 Preliminary Examination / Paper 1 2 Section A For each question, there are four possible answers, A, B, C, and D. Choose the one you consider correct. 1 Use of the Data Booklet is relevant to this question. The number of neutrons in 0.1 mol of 17O is A 1.02 x 1022 B 4.82 x 1022 C 6.02 x 1022 D 5.42 x 1023 2 A 0.0353 g sample of a volatile organic compound when vaporised completely at 100 kPa and 300 K occupied a volume of 20 cm 3. When this volume of vapour was completely burnt in excess oxygen, 40 cm 3 of carbon dioxide and 40 cm 3 of water vapour were formed. All gaseous volumes were measur ed under identical conditions. What could be the molecular formula of the organic compound? A C3H8 B C2H2O C C2H4O D C2H3N 3 Which of the following species has more protons than neutrons, and more electrons than protons? [ H = 1H ; D = 2H ; O = 16O ; S = 32S ] A OH– B S2– C D3O+ D SD2

9647 / YJC / 2014 / JC2 Preliminary Examination / Paper 1 3 4 Which statement is not a basic assumption of the kinetic theory of gases? A The gas particles have negligible size in comparison with the space they occupy. B The kinetic energy of the gas particles increases as the temperature is raised. C Collisions between the gas particles are perfectly elastic. D The particles of a given gas have the same kinetic energy at a given temperature. 5 Which statement about molecules is correct? A The Cl─P─Cl bond angle in PCl3 is 120. B Both SO2 and CO2 molecules are bent in shape. C C─O bond has a larger dipole moment than C─N bond. D The carbon atoms in benzene, C6H6 and ethyne, C2H2 are all sp2 hybridised. 6 Ice is the crystalline form of water. The diagram below shows part of the structure of ice. - - - - - - Hydrogen bond ───── Covalent bond The statement which is not true of ice is A Ice does not conduct electricity. B Ice has a giant covalent structure. C The bond angle about oxygen in ice is 109.5. D It has a lower density than water at 0 C due to its open structure.

9647 / YJC / 2014 / JC2 Preliminary Examination / Paper 1 4 7 A typical protein forms several hundreds of hydrogen bonds and several thousands of van der Waals’ forces in f olding from primary to tertiary structures. Which of the following thermodynamic state functions of the protein best represents the folding process at low temperature? ∆G ∆H ∆S A – + + B – – – C + + + D + – – 8 Hydroxylammonium ion, HONH 3 + reduces Fe 3+ to Fe 2+ in acid solution. 4 mol of Fe3+ is reduced by 1 mol of HONH3 + ion. The nitrogen-containing product is A NH4 + B N2O C NO2 – D NO 9 Five ionisation energies, in kJ mol–1, are listed below. 864 839 1008 1170 376 These values are most likely to be A the successive ionisation energies for the element of atomic number 5. B the first ionisation energies for 5 elements from Group I listed in order of increasing relative atomic mass. C the successive ionisation energies for a transition element with 4 electrons in the d sub-shell. D the first ionisation energies for successive elements in Group V, VI, VII, VIII and I.

9647 / YJC / 2014 / JC2 Preliminary Examination / Paper 1 5 10 A fuel cell is illustrated in the diagram below. There is a common electrolyte of aqueous sodium hydroxide. One electrode in the fuel cell becomes the anode and the other the cathode. Which statement about the above fuel cell is true? A Electrode A is the positive electrode. B Electrons flow from electrode A to electrode B. C The cell e.m.f under standard conditions is +0.40 V. D The electrode potential of B becom es more positive as the concentration of NaOH increases. 11 The circuit shown in the above diagram was set up. Which electrode reactions will occur? Anode reaction Cathode reaction A Fe, Cu and Ag dissolve H2 is evolved B Fe and Cu dissolve Cu is deposited C Cu dissolve Cu is deposited D O2 is evolved and Fe H2 is evolved dissolves preferentially Cu electrode containing Fe and Ag Cu electrode dilute copper(II) sulphate solution electrode B electrode A

9647 / YJC / 2014 / JC2 Preliminary Examination / Paper 1 6 12 The conjugate base of HSO4 – is A SO4 2– B H2SO4 C HSO2 – D H2SO3 13 The diagram below s