2023 YCSS Chem Prelims P1

1 YUAN CHING SECONDARY SCHOOL Secondary Four Express Course Preliminary Examination 2023 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 28 Aug 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 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 18. The total number of marks for this paper is 40. This paper consists of 18 printed pages.

2 1 A student uses the apparatus below to measure the volume of carbon dioxide gas produced when different masses of marble chips are added to 25 cm3 of dilute hydrochloric acid. Which other apparatus do the student need? A electronic balance and filter funnel B electronic balance and measuring cylinder C stopwatch and filter funnel D stopwatch and measuring cylinder 2 A student carried out a chromatography experiment. The diagram below shows the chromatogram obtained. Which one of the following gives the Rf value of the dye? A y z B y - x z C y z - x D y - x z - x

3 3 The sun-lit side of the planet Mercury has a temperature of 430 °C. The dark side of the planet has a temperature of −180 °C. Which substance may be found on one side of planet Mercury as a liquid and the other side as a solid? substance melting point / oC boiling point / oC A ethane −183 −87 B lead 328 1744 C nitrogen −210 −196 D phosphorous 44 280 4 Two experimental set-ups used to demonstrate diffusion of gases are shown in the diagrams below. The gas in each porous tube is nitrogen. In Experiment 1, the gas introduced into the beaker is carbon monoxide while in Experiment 2, the gas is argon. What changes, if any, to the water levels at P and Q would you expect to see in both experiments? Experiment 1 Experiment 2 A P and Q remain at the same level. P is at a higher level than Q. B P and Q remain at the same level. Q is at a higher level than P. C P is at a higher level than Q. P is at a higher level than Q. D P is at a higher level than Q. Q is at a higher level than P.

4 5 An element, Z, has p protons and n neutrons in its nucleus. Which row gives the possible correct number of protons, neutrons a