2023 TKGS Chem Prelims P1

This document consists of 19 printed pages. TANJONG KATONG GIRLS’ SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS E INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 21 August 2023 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name, index number on the Answer Sheet. There are forty questions in 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 19. The use of an approved scientific calculator is expected, where appropriate. Setter: Dr S Munira Marker: Dr S Munira

2 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2023 1 The diagram shows an experimental setup for the preparation and collection of a dry gas. What could the gas be? A ammonia B carbon dioxide C hydrogen D chlorine 2 The diagram shows how molecules in car exhaust gases diffuse into the air. Which statement describes what happens to these molecules next? A The molecules sink closer to the ground because they are heavier than air molecules. B The molecules move back together as they cool. C The molecules spread further into the air. D The molecules stay suspended where they are. molecules in air molecules in exhaust gases

Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2023 3 When 50 cm3 of pure ethanol is mixed with 50 cm3 of pure water in a measuring cylinder, the mixture is immediately found to have a volume of about 97 cm3. What is the best explanation for this observation? A A small volume of the ethanol has evaporated. B The water molecules move into empty spaces between the ethanol molecules. C The ethanol molecules have a random arrangement in water. D Water and ethanol react together to form a compound. 4 The diagram shows a setup to distil a mixture of propanol (boiling point 88 oC) and heptane (boiling point 98 oC). Which graph correctly shows the changes in volume of distillate in the conical flask as the distillation proceeds? water out water in boiling flask mixture of liquids heat Temperature/ oC Temperature/ oC Temperature/ oC Temperature/ oC Volume of distillate Volume of distillate Volume of distillate Volume of distillate A B C D

Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2023 5 Camphor is a substance used in skin ointments. A natural sample of camphor is found to contain impu