2022 DHS Y6 H2 Prelim Paper 1 QP

© DHS 2022 9729/01 [Turn over Name: Centre/Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 23 September 2022 1 hour READ THESE INSTRUCTIONS FIRST Write your centre number, index number, name and class at the top of this page. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. 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 15 printed pages and 1 blank page.

2 © DHS 2022 9729/01 1 Beams of charged particles are deflected by an electric field. Under identical conditions, the angle of deflection of a particle is proportional to its charge/mass ratio. In an experiment, protons are deflected by an angle of +15  by an electric field. In another experiment under identical conditions, particle Y is deflected by an angle of –5. What could be the composition of particle Y? protons neutrons electrons A 1 2 1 B 3 3 5 C 4 5 1 D 4 5 3 2 The first ionisation energies of four elements with consecutive atomic numbers below 20 are shown on the graph. One of the elements reacts with hydrogen to form a covalent compound with formula HX. Which element could be X? 3 Which molecule does not have any 90 or 180 bond angles? 1 O3 2 PF5 3 [PCl4]+ 4 SF6 A 1 and 3 only B 2 and 4 only C 1, 2 and 4 only D 3 only first ionisation energy / kJ mol−1 atomic number A D B C

3 © DHS 2022 9729/01 [Turn over 4 Which molecule has the largest overall dipole moment? A B C D CH3 CH3 H H CH3 CH3 O Cl CH3 H3C Cl Cl Cl O 5 The value of pV is plotted against p for two gases, an ideal gas and a non-ideal gas, where p is the pressure and V is the volume of the gas. Which gas shows the greatest deviation from ideal gas behaviour at 273 C? A CO2 B Cl2 C CH3OH D N2H4 6 X and Y are oxides of different elements in Period 3. If one mole of X is added to water, the solution formed is neutralised by exactly one mole of Y. What could be the identities of X and Y? X Y A P4O10 Al2O3 B SO3 Al2O3 C P4O10 Na2O D SO3 Na2O non-ideal gas pV p ideal gas

4 © DHS 2022 9729/01 7 Which factor contributes to the difference in thermal stability between CaCO3 and BaCO3? A The polarisability of the ions present in CaCO3 is greater than that of BaCO3. B The melting point of CaCO3 is lower than that of BaCO3. C The charge density of Ca2+ is higher than that of Ba2+. D The lattice energy of CaCO3 is more negative than that of BaCO3. 8 The volatility of the Group 17 elements, chlorine, bromine and iodine, decreases down the group. Which of the following is responsible for this trend? 1 bond length in the halogen molecule 2 bond strength in the halogen molecule 3 electronegativity of the halogen atom 4 number of electrons in the halogen atom A 1, 2, 3 and 4 B 4 only C 1 and 2 only D 3 and 4 only 9 30 cm3 of 0.1 mol dm−3 sulfuric acid and 40 cm3 of 0.2 mol dm−3 sodium hydroxide were mixed in a Styrofoam cup. Assume that the density and specific heat capacity of the final mixture are 1.0 g cm −3 and 4.2 J g−1 K−1 respectively. What is the temperature change of the solution given that the standard enthalpy change of neutralisation is −57.3 kJ mol−1? A −1.6 C B −1.2 C C +1.2 C D +1.6 C 10 Which statement is correct to describe the spontaneity of reaction I? reaction I T(aq) + U(s) → V(aq) + W(g) A Reaction I is only spontaneous at low temperatures if the reaction is endothermic. B Reaction I is only spontaneous at low temperatures if the reaction is exothermic. C Reaction I is spontaneous at all temperatures if the reaction is endothermic. D Reaction I is spontaneous at all temperatures if the reaction is exothermic.

5 © DHS 2022 9729/01 [Turn over 11 Use of the Data Booklet is relevant to this question. Which statements are correct? 1 H2O2 acts as both the oxidising agent and reducing agent in its decomposition. 2 MnO4− reacts with Fe3+ in a 1 : 5 ratio under acidic conditions to give Fe2+ and Mn2+. 3 In an iodometric titration, I2 is the reducing agent while S2O32− is the oxidising agent. 4 Each carbon atom in the ion, HC2O4−, has an oxidation state of +3. A 1, 2 and 4 only B 2 and 3 only C 1 and 3 only D 1 and 4 only 12 Nitric oxide, NO, reacts with hydrogen gas to give nitrogen and water only. Given that rate = k[NO]2[H2], which reaction mechanism best agrees with the experimentally determined rate law? A NO + NO ⇌ N2O2 (slow) N2O2 + H2 → N2O + H2O (fast) B NO + H2 → HNO + H● (slow) HNO + H● → 1 2N2 + H2O (fast) C 2NO + H2 → N2O + H2O (slow) N2O + H2 → N2 + H2O (fast) D 2NO + H2 → 2HNO (slow) 2HNO → N2 + H2O2 (fast)

6 © DHS 2022 9729/01 13 The initial rate method was used to investigate the reaction between compounds K and L which is catalysed by reagent M. The results obtained are shown below. experiment initial [K] / mol dm−3 initial [L] / mol dm−3 initial [M] / mol dm−3 relative rate / s−1 1 0.0025 0.08 0.80 0.50 2 0.0010 0.08 0.80 0.20 3 0.0050 0.08 0.40 0.25 4 0.0050 0.04 0.80 0.50 What is the rate equation for this reaction? A rate = k[K][L][M] B rate = k[K][L]2[M] C rate = k[K][L][M]2 D rate = k[K][L]2[M]2 14 Nitrogen dioxide can decompose to form nitrogen monoxide and oxygen. 2NO2(g) ⇌ 2NO(g) + O2(g) When 2.50 mol of nitrogen dioxide was allowed to undergo decomposition in a 0.8 dm 3 container, 0.528 mol of oxygen was present at equilibrium. What is the numerical value of the equilibrium constant, Kc, for this reaction? A 0.282 B 0.353 C 2.83 D 3.54 15 The formation of sulfur trioxide from sulfur dioxide and oxygen is a reversible reaction. 2SO2(g) + O2(g) ⇌ 2SO3(g) ΔH = –197 kJ mol–1 Which statements about this equilibrium are correct? 1 The Kc value will be halved if the stoichiometric coefficients in the equation are halved. 2 At dynamic equilibrium, the rates of the forward and backward reactions are equal to zero. 3 An increase in pressure of the system will result in a greater yield of SO3 at equilibrium. 4 When temperature is reduced, the rate constant of the forward reaction, kf, decreases to a smaller extent than that of the backward reaction, kb. A 3 and 4 only B 1 and 2 only C 2, 3 and 4 only D 1 and 3 only

7 © DHS 2022 9729/01 [Turn over 16 The pH change when 1.00 mol dm −3 hydrochloric acid was added dropwise to 25 cm 3 of 1.00 mol dm−3 piperazine (C4H10N2) is shown below. From the table below, which pair of indicators can be used consecutively to detect the end-points of the titration? indicator range bromothymol blue 6.0 – 7.6 ethyl orange 3.4 – 4.8 methyl red 4.8 – 6.0 thymolphthalein 9.4 – 10.6 A Bromothymol blue followed by ethyl orange B Bromothymol blue followed by methyl red C Thymolphthalein followed by ethyl orange D Thymolphthalein followed by methyl red 0 Volume of HCl added / cm3 pH 25 50 5.33 9.73

8 © DHS 2022 9729/01 17 A student added aqueous silver nitrate, with stirring, to three different mixtures. beaker mixture 1 sodi