2022 YHSS Chem Prelims P1

YUHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 29 August 2022 1 hour Additional Materials : Multiple Choice Answer Sheet Setter: Ms Cerenna Ng READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your Name, Class and Class Index Number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 16. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages, inclusive of this page. [Turn over

2 YHSS/Prelims/2022 Secondary Four Express Chemistry (Paper 1) 1 Liquid ethylamine and hydrochloric acid are volatile substances. Ethylamine gas, C2H5NH2, and hydrogen chloride gas, HCl, react to form a white solid, ethylamine hydrochloride. At which position in the tube would a ring of white solid ethylamine hydrochloride form? 2 The diagram shows a method to collect a dry sample of gas Z. Which information can be deduced about gas Z? 1 Z is an alkaline gas. 2 Z is less dense than air. 3 Z is very soluble in water. A 2 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 A B C D cotton wool soaked in liquid ethylamine cotton wool soaked in concentrated hydrochloric acid concentrated sulfuric acid Y Y gas Y dry sample of gas Y dry sample of gas Z gas Z concentrated sulfuric acid

3 YHSS/Prelims/2022 Secondary Four Express Chemistry (Paper 1) [Turn Over 3 A series of experiments was conducted on a newly discovered substance. Which observation suggests that the substance cannot be an element? A Electrolysis of the molten substance produces two products. B The substance dissolves in water to give a colourless solution. C The substance has a fixed melting point. D When the substance is heated in air, a white solid is formed. 4 In an experiment, a solid P is found to melt at 121 °C, the same temperature as the melting point of benzoic acid. In another experiment, some solid P is mixed with pure solid benzoic acid. The melting point of the mixture is found to be 116 °C. What can be concluded from the two experiments? A P is a mixture. B P is not benzoic acid. C P is a pure compound. D P is impure benzoic acid. 5 Compound A con