RVHS H2 CHEM P1 QP RV Prelim

River Valley High School 9647/01/PRELIM/14 2014 Preliminary Examination II RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION (II) CANDIDATE NAME CLASS 6 CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 26 September 2014 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, centre number and index number on the Answer Sheet in the spaces provided. 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 deducted for a wrong answer. Any rough working should be done in this booklet. This document consists of 19 printed pages and 1 blank page.

2 River Valley High School 9647/01/PRELIM/14 2014 Preliminary Examination II Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 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 is reacted with 40.0 cm 3 of 0.01 mol dm 3 of excess aqueous iodine. The sulf ur dioxide in the wine is oxidi sed to sulf ate, SO 4 2−, in the process. The unreacted io dine requires exactly 23.60 cm 3 of 0.02 mol dm −3 sodium thiosulfate, Na2S2O3, for complete reaction. Determine the concentration of sulfur dioxide, in mol dm−3, in the wine. A 1.64  104 B 3.28  103 C 4.72  103 D 9.44  103 2 An ion X2+ contains 24 protons. What is the electronic configuration of X3+? A 1s2 2s2 2p6 3s2 3p6 3d3 B 1s2 2s2 2p6 3s2 3p6 3d4 C 1s2 2s2 2p6 3s2 3p6 3d1 4s2 D 1s2 2s2 2p6 3s2 3p6 3d5 4s1

3 River Valley High School 9647/01/PRELIM/14 2014 Preliminary Examination II 3 Hydroxylamine (NH2OH) can react with propanone via a nucleophilic addition in the following manner: What are the values of the bond angles y and z? y z A 109.5 118 B 90 118 C 109.5 180 D 90 180 4 Which graph correctly describes the behaviour of fixed masses of the ideal gases L and M where the number of moles of L is greater than number of moles of M? A B C D y z

4 River Valley High School 9647/01/PRELIM/14 2014 Preliminary Examination II 6 A typical protein forms hundreds of hydrogen bonds and thousands of van der Waals’ forces in folding from primary to tertiary structures. Which of the following thermodynamic state functions of the protein best represents the folding process? G / kJ mol–1 H / kJ mol–1 S / J K–1 mol–1 A    B +  + C  +  D + +  7 When 0.20 mol of hydrogen gas and 0.15 mol of iodine gas are heated at 723 K until equilibrium is established, the equilibrium mixture is found to contain 0.26 mol of hydrogen iodide. The equation for the reaction is as follows: H2(g) + I2(g) ⇌ 2HI(g) What is the correct numerical value for the equilibrium constant, Kc? A 2.25 B 48.3 C 51.8 D 185.7 5 Tetrachloroethene is commonly used as degreasing solvent. The enthalpy change for the following reaction is 878.5 kJ mol1. C2H4(g) + 4HCl(g) + 2O2(g)  C2Cl4(l) + 4H2O(l) Hf (C2H4(g)) = +52.3 kJ mol1 Hf (HCl(g)) = 92.3 kJ mol1 Hf (H2O(l)) = 285.8 kJ mol1 Which of the following is the enthalpy change of formation of tetrachloroethene given the information above? A 52.2 kJ mol1 B 582 kJ mol1 C 608 kJ mol1 D 633 kJ mol1

5 River Valley High School 9647/01/PRELIM/14 2014 Preliminary Examination II 8 A system at equilibrium is subjected to the following changes separately: (i) The pressure is reduced at constant temperature (ii) The temperature is increased at constant pressure For which equilibrium will both of these changes result in an increase in the proportion of products? A H2(g) + I2(g) ⇌ 2HI(g) H = +53 kJ mol1 B 4NH3(g) + 5O2(g) ⇌ 4NO(g) + 6H2O(g) H = 950 kJ mol1 C N2(g) + 3H2(g) ⇌ 2NH3(g) H = 92 kJ mol1 D N2O4(g) ⇌ 2NO2(g) H = +57 kJ mol1 9 Solutions P, R and S contain a strong acid, a weak acid and a strong base, but not necessarily in the same order. The concentration and pH of each solution are shown below. Solution Concentration / mol dm3 pH P 1.00 2.4 R 0.01 12 S 0.001 3 Which one of the following statements is correct? A P contains a strong acid while S is contains a weak acid. B The pH at equivalence point when R is titrated against S is less than 7. C Mixing 500 cm3 of P and 500 cm3 of R produces a buffer solution. D Mixing 100 cm3 of R and 100 cm3 of S produces a buffer solution.

6 River Valley High School 9647/01/PRELIM/14 2014 Preliminary Examination II 11 When a dilute sulf ate solution of a metal J is electrolysed, the metal J and a diatomic gas K are produced at the cathode and the anode respectively in the molar ratio 2 : 1. In another experiment, the same quantity of electricity is used to electrolyse a saturated sodium chloride solution and a gas L is evolved at the anode. What is the molar ratio of J : K : L? A 2 : 1 : 1 B 2 : 1 : 2 C 4 : 2 : 1 D 4 : 2 : 3 10 The mechanism involved in the formation of XY2 is shown below: Step I : X + Y  XY (fast) Step II : XY + Y  XY2 (slow) What is the rate equation for this reaction? A Rate = k[XY][Y] B Rate = k[X][Y] C Rate = k[X][Y]2 D Rate = k[XY][Y]2 12 Use of the Data Booklet is relevant to this question. Iodine clock reaction can be used to study how the concentration of iodide ions affect the rate of oxidation of iodide ions with peroxodisulfate ions. Peroxodisulfate ions convert iodide ions into iodine slowly. S2O8 2−(aq) + 2I−(aq) 2SO4 2−(aq) + I2(aq) The rate of the reaction can be increased by the addition of catalysts such as aqueous iron(III) ions. A possible catalysed reaction pathway involves the following steps: Step 1: 2Fe3+(aq) + 2I−(aq)  I2(aq) + 2Fe2+(aq) Step 2: S2O8 2−(aq) + 2Fe2+(aq)  2SO4 2−(aq) + 2Fe3+(aq) Which of the following statements is incorrect? A Fe2+ is a stronger reducing agent than I. B S2O8 2 is a stronger oxidising agent than Fe3+. C The Ecell ⦵for step 2 is more positive than step 1. D Aqueous cobalt(II) ions can be used as a catalyst in this reaction.

7 River Valley High School 9647/01/PRELIM/14 2014 Preliminary Examination II 13 Which of the following oxides is unlikely to dissolve in concentrated sodium hydroxide? A Al2O3 B MgO C P4O10 D SiO2 14 The ion ic radii of P3, S 2 and Cl are 0.212 nm, 0.184 nm and 0.181 nm respectively. Which of the following statements correctly explains the decrease in radius from P 3 to Cl? A an increase in the nuclear charge and a constant total number of electrons B an increase in the nuclear charge and total number of electrons C an increase in total number of electrons while nuclear charge remains constant D a decrease in nuclear charge while total number of electrons remains constant 15 Which one of the following statements about Group II elements is correct? A The reactivity with cold water decreases down the group. B The charge density of the cations increases down the group. C The magnitude of the lattice energy of their oxides increases down the group. D The thermal stability of their carbonates increases down the group. 16 Which one of the following statements is most likely to be true for astatine, the element below iodine in Group VII of the per