2024 EJC H1 Chemistry Prelims P2 Solutions (for exchange)

© EJC [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2024 General Certificate of Education Advanced Level Higher 1 CANDIDATE NAME CIVICS GROUP 2 3 – INDEX NUMBER CHEMISTRY Paper 2 Structured Questions 8873/02 10 September 2024 2 hours Candidates answer on the Question Paper Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Do not use paper clips, highlighters, glue or correction fluid. Write your name, civics group, registration number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Section A Answer all questions. Section B Answer one question. The number of marks is given in brackets [ ] at the end of each question or part question. A Data Booklet is provided. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A 1 / 11 2 / 15 3 / 11 4 / 11 5 / 12 Section B 6 / 7 / 20 Total / 80 This document consists of 24 printed pages.

2 © EJC 8873/02/J2Prelims/24 For Examiner’s Use Section A Answer all questions in this section. 1 This question is regarding Period 3 elements. (a) The second ionisation energy shows a general increase across Period 3 of the Periodic Table, from Mg to Ar. (i) Define the term second ionisation energy. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ......................... [1] (ii) Write an equation to represent the second ionisation energy of silicon. ................................ ................................ ................................ ......................... [1] (iii) State the electronic configurations of Si+ and Al+. Hence, explain why the second ionisation energy of silicon is found to be lower than that of aluminium. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ............................. ................................ ................................ ................................ ......................... [2] (b) The second ionisation energies of 8 successive elements F to M from both Periods 2 and 3 of the Periodic Table are shown in Fig. 1.1. Fig. 1.1 Si+(g) → Si2+(g) + e– The second ionisation energy is the energy required to remove 1 mole of electrons from 1 mo