2022 RVHS JC2 H2 CM Prelim P1 (QP)

River Valley High School 9729/01/PRELIMS/22 2022 Preliminary Examination [Turn over RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 2 1 J CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 22 September 2022 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, class, centre number and index number on the Answer Sheet in the spaces provided. 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 16 printed pages.

2 River Valley High School 9729/01/PRELIMS/22 2022 Preliminary Examination 1 Which particle has more protons than electrons and more protons than neutrons? (D = 𝐻1 2 ) A NO2+ B ND2H C NDH− D ND3H+ 2 Which particle would, on gaining an electron, have a half-filled subshell? A V− B N C Se+ D Ti 3 The first six ionisation energies (I.E.) of a Period 3 element, M, in kJ mol −1 are shown. 1st 2nd 3rd 4th 5th 6th I.E./ kJ mol−1 1012 1907 2914 4964 6274 21267 Which equations show the formation of the chloride of M? 1 M + 2Cl2 → MCl4 2 2M + 3Cl2 → 2MCl3 3 2M + 5Cl2 → 2MCl5 A 1 and 3 only B 2 and 3 only C 1 only D 2 only 4 The boiling point of water (100 C) is greater than that of HF (20 C). Which statement is a correct explanation of this? A The H2O molecule has a larger net dipole moment than the HF molecule. B Each hydrogen bond formed between H 2O molecules is stronger than that formed between HF molecules. C There are more electrons in a H2O molecule than there are in a HF molecule, so the instantaneous dipole-induced dipole interactions are stronger in H2O. D On average, there are two hydrogen bonds between H 2O molecules compared to one hydrogen bond between HF molecules.

3 River Valley High School 9729/01/PRELIMS/22 2022 Preliminary Examination [Turn over 5 Which molecule contains a dative bond? A BF3 B NO C CO D SiO2 6 Which gas shows the greatest deviation from ideality? A CH4 B SO3 C C2H2 D CO2 7 When a sample of gas is compressed at constant temperature from 20 atm to 80 atm, its volume changes from 67.0 cm3 to 15.5 cm3. Which of the following is not a possible explanation of this behaviour? A Gas is adsorbed onto the vessel walls. B Gas begins to liquefy at 80 atm. C The gas dissociates. D The gas dimerises.

4 River Valley High School 9729/01/PRELIMS/22 2022 Preliminary Examination 8 The titration curve shows how pH changes when 20.0 cm3 of 0.20 mol dm−3 acid is titrated against 0.10 mol dm−3 base. Which of the following statements regarding this titration is incorrect? A The identity of the acid and base could be CH 3COOH and Ba(OH) 2 respectively. B A buffer solution is formed when 15 cm3 of the base is added. C The solution at equivalence point is alkaline. D This is a weak acid–strong base titration. 9 Self-heating cans offer benefits to campers without access to a stove or campfire. These soup cans have double walls with an ionic compound such as CaO in a packet and water between the walls. Upon opening the can, the packet breaks, allowing CaO to react with water and warm up the soup. CaO(s) + H2O(l) → Ca(OH)2(s) What are the signs of H, S and G for the overall process? H S G A – – – B – + – C + + – D + + +

5 River Valley High School 9729/01/PRELIMS/22 2022 Preliminary Examination [Turn over 10 Hydrogen peroxide is thermodynamically unstable and decomposes over time to form water and oxygen gas. H2O2(l) → H2O(l) + ½O2(g) The following data are provided: O2(g) + 2H2(g) → 2H2O(l) H1 = –572 kJ mol–1; S1 = –325 J mol–1 K–1 O2(g) + H2(g) → H2O2(l) H2 = –188 kJ mol–1; S2 = –225 J mol–1 K–1 What is the value of G, in kJ mol–1, for the decomposition of hydrogen peroxide at 25 C? A –79 B –100 C –117 D –354 11 The enthalpy change of reaction between calcium and water is measured in the laboratory and found to be x kJ mol–1. Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g) H = x kJ mol–1 What information is needed to calculate the value of x? 1 enthalpy change of neutralisation of calcium hydroxide 2 enthalpy change of reaction of calcium with acid 3 enthalpy change of formation of water A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only 12 When 10 cm3 of a hydrocarbon was burnt in 100 cm3 of excess oxygen, the volume of residual gas mixture contracted by 20 cm 3 after passing through a solution of aqueous sodium hydroxide. The remaining volume of gas was just sufficient to completely burn exactly 30 cm3 of the same hydrocarbon. All gas volumes were measured at room temperature and pressure. What is the formula of the hydrocarbon? A C2H2 B C2H3 C C2H4 D C2H6

6 River Valley High School 9729/01/PRELIMS/22 2022 Preliminary Examination 13 50.0 cm3 of a 0.10 mol dm–3 metallic salt solution was found to react exactly with 25.0 cm3 of 0.10 mol dm–3 aqueous sodium sulfite. In this reaction, the sulfite ion is oxidised as follows: SO32–(aq) + H2O(l) → SO42–(aq) + 2H+(aq) + 2e– The oxidation state of metal in the salt solution is +3. What is the oxidation state of metal in the product? A +1 B +2 C +4 D +5 14 Ethyl ethanoate undergoes acid-catalysed hydrolysis where the concentration of acid in the solution remains constant. CH3CO2CH2CH3 + H2O CH3CO2H + CH3CH2OH The rate equation is found to be rate = k [CH3CO2CH2CH3] [H+] In experiment 1, the half-life was found to be 31 minutes when 0.2 mol dm–3 of HCl was reacted with 0.2 mol dm–3 of ethyl ethanoate. In experiment 2, 0.1 mol dm –3 of HC l was reacted with 0.2 mol dm –3 of ethyl ethanoate. How long does it take for the concentration of ethyl ethanoate in experiment 2 to fall to 0.05 mol dm–3? A 31 min B 62 min C 93 min D 124 min 15 The reaction between NO and H2 is thought to involve the following mechanism: 2NO = N2O2 (fast) N2O2 + H2 → N2O + H2O (slow) N2O + H2 → N2 + H2O (fast) Which of the following conclusions can be drawn from this information? A N2O acts as a catalyst. B The overall order of reaction is 3. C The order of reaction with respect to H2 is 2. D The rate is independent of the concentration of NO. H+

7 River Valley High School 9729/01/PRELIMS/22 2022 Preliminary Examination [Turn over 16 In a closed system, the reaction between steam and hot iron to form ferroso -ferric oxide is an example of an equilibrium. The reaction is investigated by mixing 3.0 mol of Fe with 2.0 mol of H2O and allowing the equilibrium to establish. 3Fe + 4H2O ⇌ Fe3O4 + H2 initial moles 3.0 2.0 0 0 At equilibrium, x mol of H2O has reacted with Fe. What are the amounts, in moles, of each of the components of the equilibrium mixture? Fe H2O Fe3O4 H2 A 3.0 − 3𝑥 4 2.0 − 𝑥 4 4x 4x B 3.0 − 4𝑥 3 2.0 − x 4x 4x C 3.0 − 3𝑥 4 2.0 − x 𝑥 4 𝑥 4 D 3.0 − 4𝑥 3 2.0 − x 𝑥 4 𝑥 4

8 River Valley High School 9729/01/PRELIMS/22 2022 Preliminary Examination 17 0.1 mol solid sodium sulfide was added to a 1 dm 3 sample containing Ag+, Cu2+ and Sn4+ to obtain saturated solutions for all 3 sulfides. Relevant Ksp values are given in the table.