RI 2019 Prelim P1 QP

© Raffles Institution 2019 9729/01/S/19 [Turn Over RAFFLES INSTITUTION 2019 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 30 September 2019 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, highlighters, 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 section. 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. This document consists of 15 printed pages.

2 © Raffles Institution 2019 9729/01/S/19 [Turn Over For each question, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Copper has two stable isotopes, 63Cu and 65Cu. Which statement is correct? A 63Cu2+ ion has fewer protons than 65Cu+ ion. B The electronic configuration of 63Cu+ is [Ar] 3d9 4s1. C 63Cu+ ion has the same number of neutrons as 65Cu3+ ion. D 63Cu+ ion has fewer unpaired electrons than 65Cu3+ ion. 2 Information about some compounds are given below. compound chemical formula boiling point / °C hydrogen peroxide H2O2 150 dihydrogen disulfide H2S2 70.7 hydrazine N2H4 114 Which statements about these compounds are correct? 1 All three molecules contain at least one  bond formed by sp3–s orbital overlap. 2 The H–O–O bond angle in H2O2 is greater than the H–S–S bond angle in H2S2. 3 H2S2 has the weakest instantaneous dipole-induced dipole interaction. 4 N2H4 has less extensive hydrogen bonding than H2O2. A 1 and 2 only B 2 and 3 only C 1 and 4 only D 1, 3 and 4 only 3 Which compound has the highest solubility in water? A CH3CH2CH2NH2 B CH3CH2CO2Na C CH3CH2CH2Cl D CH3CH2CH2CH3 4 An air-filled plastic ball has a volume of 30.0 cm3. At 22 oC and 100 kPa, a slightly dented plastic ball of volume 27.5 cm3 is filled with air. To restore its spherical shape, the air inside the dented ball is heated to 57 oC. The pressure of air inside the ball increases and creates a uniform outward force. Assuming that the air inside the plastic ball behaves ideally, what is the pressure of air inside the plastic ball at 57 oC when its shape is restored? A 92 kPa B 103 kPa C 112 kPa D 238 kPa

3 © Raffles Institution 2019 9729/01/S/19 [Turn Over 5 0.010 mol of the chlorides of Al, Si and P were added s