Copy of AMKSS 2024 Chem P2

[Turn Over Candidate Name Form Class Index Number ANG MO KIO SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS CHEMISTRY 6092/02 Paper 2 22 August 2024 1 hour 45 minutes Setter: Mr Vincent Voo Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number in the spaces provided at the top of this paper. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 19. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s use Section A Section B TOTAL This document consists of 19 printed pages and 1 blank page.

2 AMKSS 4E Prelim Exam 6092/02/2024 Section A Answer all questions. 1 Fig 1.1 shows the arrangement of atoms in four substances, W, X, Y and Z. (a) State and explain, in terms of structure and bonding, which substance is a noble gas. ……………………………………………………………………………………………. ……………………………………………………………………………………………. ……………………………………………………………………………………………. [2] (b) State and explain, in terms of structure and bonding, which substance is carbon dioxide gas. ……………………………………………………………………………………………. ……………………………………………………………………………………………. ……………………………………………………………………………………………. [2] (c) Explain, in terms of structure and bonding, why substance W has high melting and boiling points. ……………………………………………………………………………………………. ……………………………………………………………………………………………. ……………………………………………………………………………………………. ……………………………………………………………………………………………. [2] (d) Suggest one similarity between substances, W, X, Y and Z. ……………………………………………………………………………………………. ……………………………………………………………………………………………. [1] [Total: 7]

3 AMKSS 4E Prelim Exam 6092/02/2024 [Turn Over 2 The reaction sequence below shows the formation of lead(II) sulfate from lead(II) oxide. (a) Lead(II) oxide is an amphoteric oxide. Explain what is meant by the term ‘amphoteric oxide’. ……………………………………………………………………………………………. ……………………………………………………………………………………………. [1] (b) Substance Y reacts with lead(II) oxide to form lead(II) nitrate. Suggest what is substance Y. ……………………………………………………………………………………………. [1] (c) Explain why lead(II) sulfate cannot be prepared by adding dilute sulfuric acid to lead(II) oxide directly. ……………………………