2024 NYJC H1 Chem 8873 P2

[Turn over NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CANDIDATE NAME CLASS TUTOR’S NAME CHEMISTRY 8873/02 Paper 2 Structured Questions 9 September 2024 2 hours Candidates answer on the Question Paper Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your name and class in the spaces provided at the top of this page. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Section B Answer one question. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 /9 2 /8 3 /9 4 /10 5 /15 6 /9 7/8 /20 Total /80 This document consists of 26 printed pages. H

2 H1 Chemistry 8873/02 NYJC J2/24 PX [Turn Over For Examiner's Use Section A Answer all questions in the spaces provided. 1 This question is about the chemistry of sodium and oxygen. (a) (i) Define the term first ionisation energy. ......................................................................................................................... ......................................................................................................................... ..................................................................................................................... [1] (ii) Explain the following comparisons of ionisation energies. • The first ionisation energy of Na (494 kJ mol –1) is very much lower than that of oxygen (1310 kJ mol–1). ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... ..................................................................................................................... [2] • The second ionisation energy of Na (4 560 kJ mol –1) is very much higher than its first ionisation energy (494 kJ mol–1). ........................................................................................................