RVHS H2 CHEM P1 QP Prelim

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 23 September 2016 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 17 printed pages and 3 blank pages.

2 River Valley High School 9647/01/PRELIM II/16 [Turn over 2016 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 For complete combustion of 20.0 g of heptane, what is the minimum volume of oxygen gas required at s.t.p.? A 0.2 dm3 B 2.2 dm3 C 49.3 dm3 D 52.8 dm3 2 Element X exists as 3 different isotopes and has a relative atomic mass of 66.6. Which of the following compositions of isotopes is correct? A 25% 65X, 50% 66X and 25% 67X B 30% 65X, 60% 66X and 10% 67X C 50% 65X, 20% 66X and 30% 67X D 10% 65X, 20% 66X and 70% 67X 3 Which of the following does not contain a singly occupied orbital? A N2+ B S– C Br+ D Sc3+ 4 Dinitrogen tetroxide, N2O4, has a simple covalent structure. Which of the following correctly describes the bonding within the dinitrogen tetroxide molecule?  bond  bond dative bond A 3 2 2 B 5 0 4 C 5 2 2 D 5 4 0

3 River Valley High School 9647/01/PRELIM II/16 [Turn over 2016 Preliminary Examination II 5 The Valence Shell Electron Pair Repulsion (VSEPR) theory is used to predict the shapes of molecules. Which shape is correctly predicted by VSEPR? number of bonded electron pairs around central atom number of lone pairs around central atom shape A 2 4 non-linear B 3 2 T-shaped C 4 1 square planar D 3 2 see-saw 6 Equal masses of gaseous N2, NH3 and N2O are injected into an evacuated container to produce a total pressure of 3 atm. How do the partial pressures of N2, NH3 and N2O compare? A pN2 = pNH3 = pN2O B pN2 < pNH3 < pN2O C pNH3 < pN2 < pN2O D pN2O < pN2 < pNH3 7 Use of the Data Booklet is relevant to this question. The enthalpy changes for three reactions are given below: Na(s)  Na(g) H = +107 kJ mol1 H+(aq) + OH(aq)  H2O(l) H = 58 kJ mol1 2Na+(g) + 2H+(aq) + 2e  2Na+(aq) + H2(g) H = 1700 kJ mol1 What is the enthalpy change for the following reaction? Na(s) + H2O(l)  Na+(aq) + OH(aq) + ½H2(g) A 191 kJ mol1 B 307 kJ mol1 C 685 kJ mol1 D 1041 kJ mol1

4 River Valley High School 9647/01/PRELIM II/16 [Turn over 2016 Preliminary Examination II 8 The dissolution of ammonium nitrate is a chemical reaction commonly used in cold packs that serve to relief pain in sports injury. A thin plastic membrane separates powdered ammonium nitrate and water. When the cold pack is squeezed, the membrane breaks and the ammonium nitrate dissolves in water. NH4NO3(s)  NH4NO3(aq) What are the signs of H, S, G for the overall process? H S G A   + B  +  C + +  D + + + 9 Hydrogen reacts with iodine according to the equation: H2(g) + I2(g) ⇌ 2HI(g) P atm of hydrogen is allowed to react with Q atm of iodine at constant temperature. At equilibrium, it is found that A the partial pressure of hydrogen is greater than P. B the total pressure of the system is (P + Q) atm. C the total pressure of the system is greater than (P + Q) atm. D the total pressure of the system is less than (P + Q) atm. 10 When 10 cm 3 of 0.02 mol dm 3 aqueous Ba(OH)2 is added to separate solutions of 10 cm 3 of 0.1 mol dm 3 MgCl2 and 10 cm 3 of 0.1 mol dm 3 CaCl2, what would be observed? (Ksp of Mg(OH)2 = 3.2 × 1011 mol3 dm9; Ksp of Ca(OH)2 = 1.35 × 105 mol3 dm9) A Only Ca(OH)2 would be precipitated. B Only Mg(OH)2 would be precipitated. C Both Mg(OH)2 and Ca(OH)2 would be precipitated. D Neither Mg(OH)2 nor Ca(OH)2 would be precipitated.

5 River Valley High School 9647/01/PRELIM II/16 [Turn over 2016 Preliminary Examination II 11 The auto-ionisation of water is represented by the following equation: H2O(l) ⇌ H+(aq) + OH(aq) H = +57 kJ mol1 Given that the value of the equilibrium constant, Kw, is 1.0 × 10 14 mol2 dm6 at 298 K, which of the following statements is true? A Water is not a neutral liquid at a temperature lower than 298 K. B When water is heated, the concentration of OH increases. C The pH of water at temperatures higher than 298 K is greater than 7. D The association of water molecules by hydrogen bonding increases as temperature rises. 12 Consider the following reaction: 3X + Y  X3Y The mechanism involves the following steps: 2X ⇌ X2 (fast) X2 + Y ⇌ X2Y (slow) X2Y + X  X3Y (fast) Based on the information, what is the rate equation for this reaction? A Rate = k[X]2 B Rate = k[X2][Y] C Rate = k[X]2[Y] D Rate = [X]3[Y] 13 The decomposition of compound A is a first order reaction which proceeds according to the equation: A(s)  2B(s) + C(g) A sample of A gave 80 cm 3 of C on complete decomposition and it took 40 min for 40 cm3 of C to be evolved. For another identical sample of A, h ow long would it take for 70 cm 3 of C to be evolved? A 40 min B 70 min C 80 min D 120 min

6 River Valley High School 9647/01/PRELIM II/16 [Turn over 2016 Preliminary Examination II 14 The Daniell Cell comprises two half -cells – a copper electrode dipped in copper( II) sulfate solution and a zinc electrode dipped in zinc sulfate solution – linked by a salt bridge. Which of the following will increase the cell e.m.f. of the Daniell Cell? A Adding solid copper(II) sulfate to the copper half-cell. B Increasing the mass of copper electrode. C Increasing the concentration of the zinc sulfate solution. D Allow the system to reach equilibrium before measuring cell e.m.f. 15 Two separate electrolyses were performed as follows, under the same conditions of temperature and pressure. 1. When aqueous hydrochloric acid was electrolysed for five minutes, 100 cm 3 of hydrogen were collected from the cathode. 2. When aqueous sulfuric acid was electrolysed for five minutes, 200 cm 3 of oxygen were collected from the anode. If the current used in electrolysis 1 was I, what was the current used in electrolysis 2? A 4I B 2I C I D 0.5I 16 Which of the following is a trend across Period 3 of the Periodic Table? A The radii of ions decrease. B The first ionisation energy decreases. C The melting points of elements decrease. D The compounds of elements become increasingly covalent.

7 River Valley High School 9647/01/PRELIM II/16 [Turn over 2016 Preliminary Examination II 17 Which of the following equations represents the reaction when calcium nitrate is heated strongly? A Ca(NO3)2  CaO + N2O5 B Ca(NO3)2  Ca(NO2)2 + O2 C 2Ca(NO3)2  2CaO + 4NO2 + O2 D 3Ca(NO3)2  Ca3N2 + 4NO2 + 5O2 18 Use of the Data Booklet is relevant to this question. Which of the following solutions of halide will not change the colour of acidified potassium dichromate(VI) ? A chloride B bromide C iodide D astatide 19 Which statement correctly defines a transition element? A Transition elements exhibit more than one oxidation state in their compounds. B Transition elements or their compounds are