ACJC H1 CHEM P1 Qn Paper

ANGLO-CHINESE JUNIOR COLLEGE DEPARTMENT OF CHEMISTRY Preliminary Examination C H E M I S T R Y 8873/01 Higher 1 Paper 1 Multiple Choice 29 August 2018 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, index number and tutorial class 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 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 12 printed pages. 8873/01/Prelim/18 ANGLO-CHINESE JUNIOR COLLEGE © ACJC 2018 Department of Chemistry [Turn over

2 © ACJC 2018 8873/01/Prelim/2018 [Turn over 1 Use of the Data Booklet is relevant to this question. Which of the following statements is incorrect? A 35.5 g of chlorine gas contains 6.0 x10 23 chlorine atoms. B 24 dm3 of hydrogen gas at 20 °C and 1 atm contains 1.2 x 10 24 hydrogen atoms. C 500 cm3 of 1 mol dm–3 aqueous magnesium nitrate contains 3.0 x 1023 nitrate ions. D 4 g of helium gas contains 6.0 x 10 23 helium atoms. 2 Wines often contain a small amount of sulfur dioxide that is added as a preservative. The sulfur dioxide content of a wine is found by the following method: A 50 cm 3 sample of white wine reacted with 40.0 cm 3 of 0.01 mol dm –3 aqueous iodine. The sulfur dioxide in the wine is oxidised to sulfate, SO42–, in the process. SO2 + I2 + 2H2O SO 42– + 2I– + 4H+ The unreacted iodine requires exactly 23.60 cm 3 of 0.02 mol dm −3 sodium thiosulfate, Na2S2O3, for complete reaction. What is the concentration of sulfur dioxide, in mol dm−3, in the wine? A 1.64 x 10–4 B 3.28 x 10–3 C 4.72 x 10–3 D 9.44 x 10–3

3 © ACJC 2018 8873/01/Prelim/2018 [Turn over 3 Use of the Data Booklet is relevant to this question. 243 94 Pu can undergo natural radioactive decay, where one of its electrons enters the nucleus to change a proton into a neutron, to form a new element M. When M is put in an ionisation chamber, it emits a high energy α-particle (which is a 4He nucleus). What is the identity of the element M and the path of the emitted α-particle in an electric field? chemical symbol of M path of α–particles A 243 93 M 2 B 243 95 M 1 C 244 93 M 2 D 244 95 M 3 4 Which of the following species has more protons than neutrons, and more electrons than protons? A He + B CO C OH– D F– electron 1 2 3

4 © ACJC 2018 8873/01/Prelim/2018 [Turn over 5 Trimethoprim (TMP) is used for the treatment of urinary tract infections. It has the following structure: In which sequence are the bond angles w, x, y and z quoted in decreasing order? A y > w > z > x B x > z = y > w C y > w > x > z D x > z > y > w 6 What is the reason of the difference in bond angle in the molecule of ammonia and water? A the number of lone electron pairs in the molecule B a bonding electron pair having greater repulsive force than a lone electron pair C a greater repulsion between the hydrogen atoms in the longer N–H bond length D a greater repulsion between the hydrogen atoms in the shorter O–H bond length

5 © ACJC 2018 8873/01/Prelim/2018 [Turn over 7 When 1.50 g of propan–1,2,3–triol, C3H8O3, (Mr = 92.0) was burnt, it was found that 100 g of water was heated from 25 oC to 67 oC. This process was found to have an efficiency of 80%. What is the magnitude for the enthalpy change of combustion of propan–1,2,3–triol in kJ mol –1? The specific heat capacity of water is 4.2 J g –1 K–1. A 866 B 879 C 1350 D 1370 8 Phosphine reacts with hydrogen iodide to form phosphonium iodide in the reaction shown. PH3(g) + HI(g) PH 4+I–(s) ΔH = –101.8 kJ mol–1 Given that ∆Hf for PH3 = +5.4 kJ mol–1, and ∆Hf for HI = +26.5 kJ mol–1, what is the standard enthalpy change of formation of phosphonium iodide? A -133.7 kJ mol –1 B -69.9 kJ mol–1 C +133.7 kJ mol–1 D +69.9 kJ mol–1 9 The table shows the charge and radius of each of six ions. Ion J+ L+ M2+ X– Y– Z2– radius / nm 0.14 0.18 0.15 0.14 0.18 0.15 The ionic solids JX, LY and MZ are of the same lattice type. What is the correct order of their lattice energies, placing the least exothermic first? A JX, LY, MZ B JX, MZ, LY C LY, JX, MZ D LY, MZ, JX

6 © ACJC 2018 8873/01/Prelim/2018 [Turn over rate [maltose] 10 The graph shows the results of an investigation of the initial rate of hydrolysis of maltose by the enzyme amylase. In the experiments, the initial concentration of maltose is varied but that of amylase is kept constant. Which of the following cannot be deduced from the above information? 1 When [maltose] is low, the rate is first order with respect to maltose. 2 When [maltose] is high, the rate is zero order with respect to maltose. 3 When [maltose] is high, the rate is zero order with respect to amylase. A 2 only B 3 only C 1, 2 and 3 D 1 and 2 only 11 The decomposition 2N 2O5 4NO 2 + O2 is first order with respect to N2O5. In an experiment, 0.10 mol of pure N2O5 was in an evacuated flask. It was found that there was 0.025 mol of N2O5 left after x minutes. Which of the following statement is true? A The half–life of N2O5 is 2 x minutes. B The time taken for 0.20 mol of N2O5 to reduce to 0.10 mol is x minutes. C The half-life is not constant for the decomposition of 0.40 mol of N2O5. D There was 0.0125 mol of N2O5 left after 2x minutes. 12 A catalytic converter is part of the exhaust system of modern cars. Which reaction does not occur in a catalytic converter? A 2CxHy + (4x + y)NO 2xCO 2 + yH2O + (2x + ௬ ଶ)N2 B CxHy + (x + y 4)O2 xCO2 + ௬ ଶH2O C 2CO + 2NO 2CO 2 + N2 D CO2 + NO CO + NO 2

7 © ACJC 2018 8873/01/Prelim/2018 [Turn over 13 Which of the following statements is true about dynamic equilibrium? A All of the reactants are used up. B The reactants have stopped reacting. C The concentrations of the reactants and products are equal. D The rate of the forward reaction is equal to the rate of the backward reaction. 14 An equilibrium can be represented by the following equation: P(aq) + Q(aq) 2 R(aq) + S(aq) The total volume of the reaction mixture is 1 dm 3 and the equilibrium concentration of Q is 0.8 mol dm–3. What wil