SRJC_H1_CHEM_P2_QP

1 SRJC 8872 / 02 / JC2 Prelims/ 2015 SERANGOON JUNIOR COLLEGE General Certificate of Education Advanced Level Higher 1 CANDIDATE NAME CLASS CHEMISTRY 8872/02 JC 2 Preliminary examination 20 August 2015 Paper 2 2 hours Additional Materials: Data Booklet Writing paper READ THESE INSTRUCTIONS FIRST Candidates answer on the question paper. Write your name and class on all the work you hand in. Write in dark or blue pen. Do not use paper clips, glue or correction fluid. The number of marks is given in bracket [ ] at the end of each question or part question. At the end of the examination, fasten all your work securely together. This document consists of 13 printed pages and 3 blank page. FOR EXAMINER’S USE P1 (MCQ) 30 P2 A1 8 A2 9 A3 16 A4 7 B5 20 B6 20 B7 20 Total 110

2 SRJC 8872 / 02 / JC2 Prelims/ 2015 Section A Answer all the questions in the spaces provided. 1 Elements A, B, C, D and E are five consecutive elements from Period 3 and 4 of the Periodic Table. The following shows the successive ionisation energies of element C. No. of electrons removed 1 2 3 4 5 6 7 8 Ionisation energy / kJ mol–1 1260 2300 3850 5150 6542 9362 11018 33604 (a) (i) Deduce and explain which group element C belongs to. ………………………………………………………………………………......................... ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………......................... ………………………………………………………………………………......................... ………………………………………………………………………………......................... (ii) Hence, state the identity of element C and write down its electronic configuration. ………………………………………………………………………………………………… ………………………………………………………………………………………………… [4] (b) Explain the following observations, giving equations where appropriate. (i) The first ionisation energy of element B is lower than the first ionisation energy of element A. ………………………………………………………………………………......................... ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………......................... ………………………………………………………………………………………………… For Examiner’s use

3 SRJC 8872 / 02 / JC2 Prelims/ 2015 (ii) A strongly acidic solution is formed when the chloride of A reacts with water. ………………………………………………………………………………………………… ………………………………………………………………………………......................... ………………………………………………………………………………………………… ………………………………………………………………………………………………… [4] [Total: 8] For Examiner’s use For Examiner’s use

4 SRJC 8872 / 02 / JC2 Prelims/ 2015 2 A sequence of reactions is shown below. v (a) In