2021 C1 Promo P1 QP

This question booklet consists of 9 printed pages. HWA CHONG INSTITUTION C1 Promotional Examination Higher 2 CANDIDATE NAME CT GROUP 21S CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 30 September 2021 40 min READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Complete the information on the Multiple Choice Answer Sheet as shown below. There are twenty 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. 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.

2 © Hwa Chong Institution 2021 9729/01/C1 Promotional Exam 2021 [Turn over A, M 1 Which particle does not contain either an unpaired s electron or an unpaired p electron? 1 Cr 2 Ge 3 S2 4 Sc 1 (h) A 4 only B 1 and 2 only C 3 and 4 only D 1, 3 and 4 only B, M 2 Use of the Data Booklet is relevant to this question. A scientist attempts to produce C14 using a neutron and an isotope X of an element as shown in the equation below. one neutron + X  C14 + H3 Which row in the table correctly states the number of neutrons in X and the identity of X? 1 (d) number of neutrons in X identity of X A 3 Li B 7 Li C 9 N D 14 N

3 © Hwa Chong Institution 2021 9729/01/C1 Promotional Exam 2021 [Turn over B, H 3 The graph shows the successive ionisation energies for the removal of the first 19 electrons from an element Y. Which statement about Y may be correct? 1(j) A Y is cobalt. B Y is manganese. C Y belongs to Group 14. D Y belongs to Group 17. A, L 4 A compound has the structure shown. What are the values of the bond angles x, y and z? 2(e) x y z A 109.5 90 180 B 109.5 109.5 120 C 120 90 180 D 120 109.5 120 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 energy / kJ mol1 no. of electrons removed

4 © Hwa Chong Institution 2021 9729/01/C1 Promotional Exam 2021 [Turn over A, L 5 When barium metal burns in oxygen, the ionic compound barium peroxide, BaO2, is formed. Which dot-and-cross diagram could represent the structure of the peroxide anion in BaO2? 2(b)(i) A B C D B, M 6 In which pairs of compounds does the first molecule have a net dipole but the second molecule have no net dipole? 1 SO2 and CO2 2 PF3 and BF3 3 BrF5 and SiF4 5 (e)(ii) A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only B, H 7 Flask A contains 1 dm3 of helium at a pressure of