2024 Prelims RVHS H2 Chem P1 (QP)

River Valley High School 9729/01/PRELIMS/24 2024 Preliminary Examination [Turn over RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 2 3 J CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 18 September 2024 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 14 printed pages and 2 blank pages.

2 River Valley High School 9729/01/PRELIMS/24 2024 Preliminary Examination 1 Use of the Data Booklet is relevant to this question. Some isotopes are unstable and decompose naturally. In one type of decomposition, a neutron in the nucleus decomposes to form a proton, which is retained in the nucleus, and an electron, which is expelled from the atom. Which change describes such a process? A 11C → 12C B 22Na → 22Ne C 32P → 31P D 40K → 40Ca 2 Which statement is correct? A One mole of a compound is the amount that contains the same number of atoms as there are in 12.000 g of carbon-12. B The relative isotopic mass of lithium-7 is given by the following expression. average mass of all isotopes of lithium 1 the mass of one atom of carbon-1212 C The relative atomic mass of oxygen is given by the following expression. average mass of one atom of oxygen 1 the mass of one atom of carbon-1212 D The relative molecular mass of a compound E is given by the following expression. average mass of one atom of E 1 the mass of one molecule of carbon-1212

3 River Valley High School 9729/01/PRELIMS/24 2024 Preliminary Examination [Turn over 3 Use of Data Booklet is relevant to this question. Sodium percarbonate, (Na 2CO3)x.y(H2O2), is an oxidising age nt in some home and laundry cleaning products. 10.0 cm3 of 0.100 mol dm−3 sodium percarbonate releases 48.0 cm3 of carbon dioxide at room conditions on acidification. An identical sample, on titration with 0.0500 mol dm −3 KMnO4, requires 24.0 cm 3 before the first pink colour appears. KMnO4 reacts with H2O2 in the mole ratio 2 : 5. What is the ratio y x ? A 1 3 B 2 3 C 3 2 D 3 1 4 Which statement does not correctly describe the graphite lattice? A The lattice contains delocalised electrons. B Each carbon atom in the lattice has three closest neighbours. C Weak intermolecular forces of attraction hold each layer of carbon atoms together. D Conduction of electricity takes place parallel to the axis of the unhybridised 2p orbitals. 5 Use of the Data Booklet is relevant to this question. Which particle contains a single unpaired electron? A a molecule of NO2 B the copper ion in Cu2O C the lithium ion in lithium aluminium hydride D a particle formed from the heterolytic fission of a chlorine molecule 6 Flask P contains 1 dm 3 of helium at 2 kPa and flask Q contains 2 dm 3 of neon at 1 kPa. If the flasks are connected at constant temperature, what is the final pressure? A 3 kPa B 5 3 kPa C 3 2 kPa D 4 3 kPa

4 River Valley High School 9729/01/PRELIMS/24 2024 Preliminary Examination 7 Given the following data, what is the standard enthalpy change of vapourisation of H2O(l)? Hc of C2H6(g) = −1561 kJ mol−1 Hf of C2H6(g) = −85 kJ mol−1 Hf of CO2(g) = −394 kJ mol−1 Hf of H2O(g) = −243 kJ mol−1 A −43 kJ mol−1 B +43 kJ mol−1 C −529 kJ mol−1 D +529 kJ mol−1 8 Both mercury(I) sulfate, Hg 2SO4, and cadmium(I) sulfate, Cd 2SO4, are odourless white crystalline solids. Hg2SO4 is sparingly soluble while Cd 2SO4 is very soluble in water. lattice energy of Hg2SO4 = −2127 kJ mol−1 Hhyd of Hg+ = −625 kJ mol−1 Hhyd of SO42− = −1160 kJ mol−1 Which one of the following statements is correct? A Hsoln of Hg2SO4 is endothermic and Hsoln of Cd2SO4 is exothermic. B Hsoln of Hg2SO4 has a magnitude of 283 kJ mol−1. C The lattice energy of Hg2SO4 is more exothermic than that of Cd2SO4. D The standard enthalpy change of hydration of Hg+ is more exothermic than that of Cd+.

5 River Valley High School 9729/01/PRELIMS/24 2024 Preliminary Examination [Turn over 9 Solutes dissolve in solvents to form solutions. If a semi -permeable membrane is placed between a pure solvent and a solution containing a solute in that solvent, only pure solvent molecules will pass through the membrane into the solution. This process is called osmosis. In which processes will S be positive? 1 dissolving the solute in a solvent to form a dilute solution 2 the evaporation of solvent from the solution 3 the passage of the solvent through a semi -permeable membrane during osmosis A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only 10 Ideal gases A and B react to produce a liquid C: A(g) + B(g) → C(l) When equimolar amounts of A and B were introduced into a vessel of volume V, the initial rate of the reaction is measured to be y mol dm‒3 s‒1. Given that the reaction is 1 st order with respect to [A] and 2nd order with respect to [B], what would be the initial rate of the reaction if the vessel is compressed to a volume of 0.25V? A 64y B 32y C 16y D 8y 11 The hydrolysis of ethylamide in aqueous solution can be catalysed by hydrogen ions from sulfuric acid. To determine the order of reaction with respect to hydrogen ions, which method should be used? A Measure the change in pH during the reaction. B Measure the rate of reaction several times, but with different concentration of ethylamide each time. C Measure the rate of reaction several times, but with different concentration of sulfuric acid each time. D Remove samples at various time interval and titrate against a standard solution of aqueous sodium hydroxide.

6 River Valley High School 9729/01/PRELIMS/24 2024 Preliminary Examination 12 Which statement concerning only the elements in Period 3 is incorrect? A The element with the smallest anion is chlorine. B The element with the highest melting point is aluminium. C The element with the highest electrical conductivity is aluminium. D The element with eight atoms in its molecule is sulfur. 13 In this question, the symbol ‘<’ means ‘less positive than’ or ‘more negative than’. Silver chloride dissolves in dilute and concentrated NH3(aq) whereas silver bromide is only soluble in concentrated NH3(aq). The following equations represent the equilibria involved. AgCl(s) = AgCl(aq) G1 AgCl(aq) + 2NH3(aq) = Ag(NH3)2Cl(aq) G2 AgBr(s) = AgBr(aq) G3 AgBr(aq) + 2NH3(aq) = Ag(NH3)2Br(aq) G4 Some relationships between the free energies of the four reactions are as follow. 1 (G1 + G2) < (G3 + G4) 2 G2 = G4 3 G2 < G4 4 G1 < G3 Which relationships are correct? A 1, 2 and 4 B 1 and 3 only C 2 and 4 only D 3 only

7 River Valley High School 9729/01/PRELIMS/24 2024 Preliminary Examination [Turn over 14 Methanol is produced by the following reaction. CO(g) + 2H2(g) = CH3OH(g) H = negative Which pair of changes will definitely increase the amount of methanol present at equilibrium? pressure temperature A decrease decrease B decrease increase C increase decrease D increase Increase 15 At