Yuan Ching Prelim P1

1 YUAN CHING SECONDARY SCHOOL Secondary Four Express Course Preliminary Examination 2024 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 27 Aug 2024 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 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. The use of an approved scientific calculator is expected, where appropriate. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on Page 22. The total number of marks for this paper is 40. This paper consists of 22 printed pages.

2 1 A student wants to carry out an experiment to follow the rate of the reaction between hydrochloric acid and marble chips. CaCO3 + 2HCl → CaCl2 + CO2 + H2O Which diagrams show apparatus that is suitable for this experiment? 1 2 3 4 A 1 and 2 only B 1 and 3 only C 1 and 4 only D 1, 2 and 4

3 2 Solutions of lead(II) nitrate and potassium iodide are mixed together in the preparation of lead(II) iodide. Which method can be used to separate the lead(II) iodide from the mixture? A crystallisation B distillation C evaporation D filtration 4 Which of the following substances can be used to distinguish these three gases:  hydrogen  carbon dioxide  oxygen A blue litmus paper B glowing splint C lighted splint D limewater 3 A small amount of aqueous copper(II) sulfate is put into a test-tube. A few drops of aqueous ammonia are added to the test-tube. Then an excess of aqueous ammonia is added to the same test-tube. What are the two observations? few drops of aqueous ammonia excess aqueous ammonia A dark blue solution dark blue solution B dark blue solution light blue solution C light blue solution dark blue solution D light blue solution light blue solution

4 5 Naphthalene present in mothballs has a melting point of 80.26 °C. A heated sample of pure naphthalene is cooled and the temperature is recorded every minute. A graph of the results is shown. Which process occurs between 6 and 10 minutes? A boiling B condensing C freezing D melting

5 6 Ethanol forms a miscible mixture with water. A student mixes 25 cm3 of ethanol with 25 cm3 of water. Which diagram best represents the mixture? 7 Carbon has two isotopes