VJC 2021 Prelim H2P2 Qns [FInal]

1 Ó VJC 2021 9729/02/PRELIM [Turn over CANDIDATE NAME CT GROUP VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATIONS Higher 2 ……………………………………………….………….. …………………………….. CHEMISTRY 9729//02 Paper 2 Structured Questions Candidates answer on the Question Paper. 15 September 2021 2 hours Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your index number, name and CT group in the spaces at the top of this page. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 /10 2 /15 3 /10 4 /15 5 /12 6 /13 Total /75 This document consists of 22 printed pages and 2 blank pages.

2 Ó VJC 2021 9729/02/PRELIM [Turn over 1 The table below shows the fifth to eighth ionisation energies of two consecutive elements, X and Y in the second period of the Periodic Table. successive ionisation energies / kJ mol–1 5th 6th 7th 8th X 10990 13330 71330 84080 Y 11020 15160 17870 92040 (a) (i) With the aid of an equation, define the term first ionisation energy with reference to X. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………....... ………………………………………………………………………………………....... ………………………………………………………………………………………....... [2] (ii) State and explain the group number of X. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… [1] (b) (i) Write down the full electronic configurations of X+ and Y+. X+: ………………………………. Y+: ………………………………. [1]

3 Ó VJC 2021 9729/02/PRELIM [Turn over (ii) Hence, explain which element has a less endothermic second ionisation energy.