RI 2024 Y5 Timed Practice QP

This document consists of 31 printed pages and 1 blank page. RAFFLES INSTITUTION 2024 YEAR 5 TERM 3 TIMED PRACTICE Higher 2 CHEMISTRY 9729 2 July 2024 2 hours 15 minutes Additional Materials: Multiple Choice Answer (OMR) Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, 6-digit exam index number and civics tutorial group in the spaces provided on the OMR sheet and the cover sheet on page 7. Shade your 6-digit exam index number on the OMR sheet. This paper consists of three sections, A, B and C. Section A (15 marks) consists of 15 multiple-choice questions. Answer this section first. The OMR sheet will be collected after the first 30 minutes. 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 OMR sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in the question paper. Section B (30 marks) consists of 3 structured questions. Answer all questions in the spaces provided in the question paper. If additional space is required, you should use the pages at the end of the booklet (pages 30 – 32). The question number must be clearly shown. Section C (35 marks) consists of 2 free-response questions. Answer all questions in the spaces provided in the question paper. If additional space is required, you should use the pages at the end of the booklet (pages 30 – 32). The question number must be clearly shown. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. This document is copyrighted, please do not reproduce it without permission

2 © Raffles Institution 2024 9729/J/24 [Turn Over Section A (15 marks) For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Use of the Data Booklet is relevant to this question. Which of the following contains the same number of atoms or ions as there are atoms in 0.2 g of oxygen gas? A 0.225 g of water C 0.300 dm3 of neon gas at r.t.p. B 1.275 g of aluminium oxide D 0.284 dm3 of nitrogen gas at s.t.p. 2 Tin(II) ions can be oxidised to tin(IV) ions by iodate(V) ions, IO3−. The equation for the oxidation is shown below. Sn2+ → Sn4+ + 2e− In an experiment, 25.0 cm 3 of 0.0250 mol dm −3 IO3− was found to react with 31.20 cm 3 of 0.0400 mol dm−3 Sn2+. What is the oxidation number of iodine in the iodine-containing product? A –1 B 0 C +1 D +3 3 The table shows the fifth ionisation energies of four consecutive elements in the Periodic Table. What is the formula of the chloride of Q? element Q R S T fifth ionisation energy / kJ mol−1 32828 37832 9445 10989 A QCl2 B QCl3 C QCl4 D QCl5 4 Beams of charged particles are deflected by an electric field. 7Li+ ions are deflected by an electric field through an angle of +xº. Which particle will be deflected through an angle of more than +xº? proton number nucleon number number of electrons A 7 14 9 B 8 16 9 C 13 27 10 D 17 35 10 This document is copyrighted, please do not reproduce it without permission

3 © Raffles Institution 2024 9729/J/24 [Turn Over 5 Which of the following shows the species quoted in order of increasing bond angle about the central atom? A XeF2 < BrF2+ < NO2 B BrF2+ < NO2 < XeF2 C NO2 < BrF2+ < XeF2 D NO2 < XeF2 < BrF2+ 6 Hydroxylamine, NH2OH, reacts with BF3 to form an adduct, F3B•NH2OH. Which statements about F3B•NH2OH are correct? 1 Intramolecular hydrogen bonding can exist in F3B•NH2OH. 2 The bonds around B atom are tetrahedrally arranged. 3 The H–N–O angle is larger than the H–O–N angle. A 1, 2 and 3 C 1 and 3 B 1 and 2 D 2 only 7 Which groups of compounds contain one that is ionic, one that is simple molecular and one that is giant molecular? 1 Si, AlF3, HCl 2 SiCl4, Al2O3, HBr 3 AlCl3, SiO2, BaI2 A 1 and 2 C 2 and 3 B 1 and 3 D 3 only This document is copyrighted, please do not reproduce it without permission

4 © Raffles Institution 2024 9729/J/24 [Turn Over 8 Which diagram best represents the structure of solid sodium chloride? A C B D 9 A sealed container contains two gases, X and Y, with a mole ratio of 1 : 2. The total pressure is P atm. A third gas, Z, is introduced into the same container and the total pressure becomes 2P atm. What is the partial pressure, in atm, of gas X after the introduction of gas Z, assuming that the temperature and volume of container remain constant? A P 6 B P 3 C 2P 3 D P 10 During the operation of a refrigerator, the coolant is constantly being liquefied under pressure, and vaporised once the pressure is released. Under these conditions, the gas does not behave as an ideal gas. Which statement best describes why the gas liquefies under pressure? A Increasing the pressure causes the boiling point of the gas to decrease. B Increasing the pressure dec reases the kinetic energy of the molecules, creating the ordered liquid state. C Increasing the pressure dec reases the size of the molecules, and so increases the intermolecular attractions. D Increasing the pressure pushes the molecules closer together, and so the short -range intermolecular forces of attraction are more effective. This document is copyrighted, please do not reproduce it without permission

5 © Raffles Institution 2024 9729/J/24 [Turn Over 11 Use of the Data Booklet is relevant to this question. The design for an experimental self-heating can for coffee is shown below. The outer container is filled with water that surrounds the inner container holding the coffee solution. When the piston is pressed, it punctures the plastic bag and allows the CaCl 2 powder to dissolve in the water in an exothermic reaction. CaCl2(s) → Ca2+(aq) + 2Cl–(aq) ∆H = –83 kJ mol–1 Sufficient energy must be released to heat both the water and coffee from 25 °C to 70 °C. Each can contains 76 cm3 of the coffee solution and 70 cm3 of water. Assume the following for both the CaCl2 and coffee solution: density = 1.0 g cm–3 specific heat capacity = 4.18 J g–1 K–1 Assuming negligible heat loss, what mass of CaCl2 powder is required in this design? A 8.8 g B 17.6 g C 19.1 g D 36.8 g 12 Which reaction has an enthalpy change equal to the lattice energy of lithium fluoride? A Li(g) + F(g) → LiF(s) B Li(s) + ½F2(g) → LiF(s) C Li+(g) + F–(g) → LiF(g) D Li+(g) + F–(g) → LiF(s) water piston coffee solution CaCl2 powder in a thin plastic bag This document is copyrighted, please do not reproduce it without permission

6 © Raffles Institution 2024 9729/J/24 [Turn Over 13 Which of the following estimates the enthalpy change of the reaction below? A BE(C─O) + BE(C─C) ─ BE(O─H) ─ BE(C=C) B BE(C=C) + BE(O─H) ─ BE(C─C) ─ BE(C─O) C BE(C=C) + BE(O─H) ─ BE(C─C) ─ BE(C─O) ─ BE(C─H) D BE(C─H) + BE(C─O) + BE(C─C) ─ BE(O─H