AES Prelim P2

Name: ………………………………( ) This Question Paper consists of 25 printed pages including this page. [Turn over ASSUMPTION ENGLISH SCHOOL PRELIMINARY EXAMINATION 2024 CHEMISTRY 6092 / 02 ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL LEVEL: Sec 4 Express DATE: 21 August 2024 CLASS: Sec 4/1 DURATION: 1 hour 45 minutes Additional Materials Provided: -NIL- INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write your NAME and INDEX NUMBER at the top of this page. This paper consists of 2 sections. SECTION A STRUCTURED QUESTIONS (70 marks) Answer ALL questions. Write your answers in the spaces provided. SECTION B FREE RESPONSE QUESTIONS (10 marks) 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. The use of an approved scientific calculator is expected where appropriate. A copy of the Periodic Table is provided on Page 25. For Examiner’s use: Paper 1 / 40 Paper 2 Section A / 70 Paper 2 Section B / 10 Paper 3 / 40 Total / 160 Total (%) / 100

2 6092/02/4E/PRELIM/2024 SECTION A: STRUCTURED QUESTIONS [70 marks] Answer all questions in the spaces provided. 1 A list of substances is shown below. potassium iodide silicon dioxide copper(II) oxide iron(III) chloride graphite lead( II) oxide zinc bromide aluminium Choose from the list of substances to answer the questions below. Each substance can be used once, more than once, or not at all. (a) Which compound has a giant covalent structure? ……………………………………………………………………………………. [1] (b) Which substance reacts with both acids and alkalis? ……………………………………………………………………………………. [1] (c) Which ionic compound has a formula of XY2? ……………………………………………………………………………………. [1] (d) Which substance forms a yellow precipitate when added with aqueous silver nitrate? ……………………………………………………………………………………. [1] (e) Which substance turns from black to red brown when heated with hydrogen gas? ……………………………………………………………………………………. [1] [Total: 5]

3 6092/02/4E/PRELIM/2024 [Turn over 2 Aqueous hydrogen peroxide, H2O2, is commonly used in the sterilisation of contact lenses due to its effective antimicrobial properties. It decomposes at room temperature to form water and oxygen. (a) Write a balanced chemical equation for the deco