2023 RI H2 Chem Prelims P1 Questions

1 © Raffles Institution 2023 9729/01/S/23 [Turn Over RAFFLES INSTITUTION 2023 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 22 September 2023 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number in the spaces provided on the Answer Sheet. There are thirty questions in 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 the question booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 13 printed pages and 1 blank page.

2 © Raffles Institution 2023 9729/01/S/23 [Turn Over 1 Which simple covalent molecule is non-polar? A CH2F2 B SF4 C NF3 D BeF2 2 In octa-1,3,7-triene, three of the carbon-carbon bonds are labelled p, q and r. What is the correct order of decreasing bond strength? A p → r → q B p → q → r C r → q → p D r → p → q 3 Which bonding type does not correspond to its description of physical properties? bonding type physical properties A giant covalent high melting point, conducts electricity when in solution but not when solid B simple covalent low melting point, does not conduct electricity in any state C metallic variety of melting points, conducts electricity when solid and when molten D ionic high melting point, conducts electricity when molten but not when solid 4 Use of the Data Booklet is relevant to this question. The table shows the seventh, eighth, ninth and tenth ionisation energies of an element in the third period. 7th 8th 9th 10th ionisation energy / kJ mol–1 20 117 25 496 28 932 141 362 Which element has these ionisation energy values? A Na B Mg C Al D Si

3 © Raffles Institution 2023 9729/01/S/23 [Turn Over 5 Down the group, the atomic radius of the elements increases. Which statements explain this? 1 The number of protons increases. 2 The number of electronic shells increases. 3 The electrostatic forces of attraction between the nucleus and valence electrons increases. A 1 only B 2 only C 2 and 3 only D 1, 2 and 3 6 X and Y are two different samples of the same ideal gas. Given that X contains a higher mass than Y, which graph shows the correct ideal gas relationship for the two samples of gas? A B C D

4 © Raffles Institution 2023 9729/01/S/23 [Turn Over 7