RI 2023 Y5 Timed Practice QP

This document is copyrighted, please do not reproduce it without permission 1 This document consists of 29 printed pages and 1 blank page. RAFFLES INSTITUTION 2023 YEAR 5 TERM 3 COMMON TEST Higher 2 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 9729 6 July 2023 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 sheets on pages 1 and 19. 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 for Section B (pages 17 – 18). 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. Answers to this section are to be written in the spaces provided in the question paper. If additional space is required, you should use the pages at the end of the booklet for Section C (pages 29 – 30). 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. Question Marks B1 / 11 B2 / 10 B3 / 9

This document is copyrighted, please do not reproduce it without permission 2 © Raffles Institution 2023 9729/J/23 [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 Which statement about relative molecular mass is correct? A It is the ratio of the mass of a molecule to the mass of a carbon-12 atom. B It is the ratio of the mass of one mole of molecules to 1 12 the mass of a carbon-12 atom. C It is the ratio of the average mass of a molecule to the mass of a carbon-12 atom. D It is the ratio of the average mass of a molecule to 1 12 the mass of a carbon-12 atom. 2 Use of the Data Booklet is relevant to this question. In country A, the national environmental standard states that the average concentration of sulfur dioxide in air should not exceed 0.570 mg m−3. How many SO 2 molecules are there in 1 m 3 of air with an SO 2 concentration of 0.570 mg m−3? A 5.35 x 1018 C 1.61 x 1021 B 1.61 x 1019 D 5.35 x 1021 3 A sample of nickel contains only three isotopes, 58Ni, 60Ni and 62Ni. The isotopes 58Ni and 60Ni have a percentage abundance of 69.51% and 26.78% respectively. The sample is reacted completely with chlorine-35 to form nickel(II) chloride. Ni + 35Cl2 ⎯→ Ni35Cl2 What is the relative formula mass of nickel(II) chloride formed from this sample? A 93.68 B 94.18 C 128.68 D 129.68

This document is copyrighted, please do not reproduce it without permission 3 © Raffles Institution 2023 9729/J/23 [Turn Over 4 Use of the Data Booklet is relevant to this question. Which pairs of species have the same number of electron pairs? 1 Mg and P 2 As and Ge 3 Ba and Pb2+ A 1 only C 2 only B 1 and 2 only D 1, 2 and 3 5 X has a smaller nucleon number than Y. X and Y has the same number of neutrons and electrons. What is the possible identity of X and Y? X Y A Ar18 36 Si14 32 B Si14 33 Ar18 36 C Si14 32 Ar18 36 D Si14 33 Ar18 37 6 In three separate experiments, individual beams of 2H+, 18O2– and 9Be2+ particles, travelling at the same velocity, pass through an electric field as shown. Which statements are correct? 1 2H+ particles are deflected to the smallest extent. 2 9Be2+ particles are deflected to a larger extent than the 18O2– particles. 3 9Be2+ particles are deflected towards the positively charged plate. 4 18O2– particles are deflected towards the positively charged plate. A 1 and 3 only C 1, 2 and 3 B 2 and 4 only D 1, 2 and 4 4− 4− 4− 4+ + – beam of particles

This document is copyrighted, please do not reproduce it without permission 4 © Raffles Institution 2023 9729/J/23 [Turn Over 7 Which diagram shows a correctly labelled 3d orbital? A C B D 8 The value of pV is plotted against p for two gases, an ideal gas and a real gas, where p is the pressure and V is the volume of the gas. Which gas shows the greatest deviation from ideality? A ammonia C methane B neon D hydrogen 3dx2- y2 3dz2 3dy 3dxz 0 pV p real gas ideal gas

This document is copyrighted, please do not reproduce it without permission 5 © Raffles Institution 2023 9729/J/23 [Turn Over 9 Which graphs correctly describe the behaviour of a fixed mass of an ideal gas? (T is measured in K and p is measured in bar.) 1 3 2 4 A 2 only C 2 and 3 B 1 and 3 D 3 and 4 10 A sample of gas (Mr = 28.0) is found to occupy V cm3 at T oC and p bar. What is the mass of the gas, in grams, in this sample? A 28.0  pV  273 (273 + T)  22700 B 28.0  pV  273 T  22700 C 28.0  pV  (273 + T) T  22700 D 28.0  22700  273 pV  (273 + T) V 1 p 0 constant T 1 T V 0 constant p constant V 1 V p 0 p T 0 constant T

This document is copyrighted, please do not reproduce it without permission 6 © Raffles Institution 2023 9729/J/23 [Turn Over 11 What is the order of increasing bond angles? A a < b < c <d B d < c < b < a C b < a < c < d D d < a < b < c 12 Diamond and graphite are allotropes of carbon with the following structures. diamond graphite Which statements are correct? 1 Diamond is harder than graphite because the C−C covalent bonds in diamond are stronger than the intermolecular forces between the layers in graphite. 2 Diamond has a lower entropy than graphite due to its more rigid structure. 3 Diamond can conduct electricity due to the continuous lattice of C −C covalent bonds. A 1 only C 2 and 3 only B 1 and 2 only D 1, 2 and 3

This document is copyrighted, please do not reproduce it without permission 7 © Raffles Institution 2023 9729/J/23 [Turn Over 13 Compound Z has the following structure. How many  and  bonds are present in compound Z?   A 4 2 B 4 4 C 6 2 D 6 4 14 When solid ammonium nitrate is added to water at room temperature, it is observed that the solid dissolves readily to give a cold solution. What are the signs of ∆H and ∆S for