2023 SCGS Chem Prelims P1

CANDIDATE NAME CLASS 4 REGISTER NUMBER CENTRE NUMBER INDEX NUMBER CHEMISTRY 6092/01 PAPER 1 Multiple Choice 30 August 2023 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number on the Answer Sheet in the spaces provided. There are forty questions in this paper. Answer all questions. For each question, there are four possible answers, A, B, C, 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 18. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 18 printed pages. SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR

2 [Turn Over 1. When iron reacts with dilute hydrochloric acid, hydrogen is formed. Due to the presence of impurities in the iron , some hydrogen sulfide gas is also formed in the reaction . Hydrogen sulfide gas is soluble in water. Which diagram shows the apparatus suitable to prepare a pure and dry sample of hydrogen? A B C D iron and hydrochloric acid water concentrated sulfuric acid iron and hydrochloric acid water concentrated sulfuric acid iron and hydrochloric acid concentrated sulfuric acid water iron and hydrochloric acid concentrated sulfuric acid water

3 [Turn Over 2. In which state does 1 dm3 of ethene contain the most particles? A gas at 100 °C B gas at room temperature C liquid D solid 3. A student carried out an experiment using the set-up shown below to separate a mixture containing four alcohols. The table gives the boiling points of the four alcohols used. alcohol boiling point / °C butanol 117 ethanol 79 pentanol 138 propanol 97 Despite repeated attempts, the student only managed to obtain two alcohols from the mixture. Which alcohols did he fail to obtain? A butanol and ethanol B butanol and pentanol C ethanol and propanol D pentanol and propanol thermometer water condenser alcohol collected mixture of alcohols electric heater

4 [Turn Over 4. Chromatography is carried out on a mixture of three substances. The chromatogram is sprayed with a locating agent and the result is shown below. What are the possible reasons why the chromatogram shows only two spots? 1 One of the substances in the mixture is insoluble in the solvent. 2 The l