Copy of 2024 ANDSS 4E Chem Prelim P2 QP

This document consists of 25 printed pages and 1 blank page. Setter: Mr Edmund Tan O ANDERSON SECONDARY SCHOOL Preliminary Examination 2024 Secondary Four Express CANDIDATE NAME: CLASS: / INDEX NUMBER: CHEMISTRY Paper 2 6092/02 15 Aug 2024 1 hour 45 minutes 0800 – 0945h Candidates answer in the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index 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. 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 26. The use of an approved scientific calculator is expected, where appropriate. Section A 70 Section B 10 Total 80

Preliminary Examinations 4E CHEMISTRY 6092 2024 2 Section A Answer all questions. 1 (a) Use the list of substances to answer the questions. You may use each substance once, more than once or not at all. argon carbon carbon dioxide chlorine iron iron(II) chloride oxygen neon (i) Which two substances are diatomic gases at room temperature? …………………………………………………………………………… ... [1] (ii) Which substance is a compound that contains a transition element? …………………………………………………………………………… ... [1] (iii) Which substance provide an inert environment in light bulbs? …………………………………………………………………………… ... [1] (iv) Which two substances form acidic oxides? …………………………………………………………………………… ... [1] (v) Which two substances produce a solid when added to aqueous silver nitrate? …………………………………………………………………………… ... [1]

Preliminary Examinations 4E CHEMISTRY 6092 2024 3 (b) Table 1.1 describes three processes. Complete Table 1.1 by filling in the missing information. Table 1.1 description of process name of process conversion of polyunsaturated fats to saturated fats formation of an organic compound by the reaction of alcohols and carboxylic acids mixing dilute hydrochloric acid and aqueous sodium hydroxide [3] [Total: 8]

Preliminary Examinations 4E CHEMISTRY 6092 2024 4 2 Mothballs, often used to repel moths and insects, gradually disappear over time when placed in a closed cupboard. A student places some mothballs in a closed cupboard and records its mass over several days. The following data was collected. day mass of mothballs/ g 0 5.0 2 4.6 4 4.2 6 3.8 8 3.4 During the experiment, no liquid or solution was found in the cupboard. A pungent gas was produced and can be detected whenever the cupboard doors are opened. (a)