YSS 4E Pure Chem Paper 1 Prelim 2024

[Turn over YISHUN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY 4 EXPRESS CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 28 August 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. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C or 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 document consists of 17 printed pages and 1 blank page.

2 1 A student wants to investigate if dissolving 2.35 g of a salt in 25.0 cm3 of water is an endothermic process. Which pieces of apparatus are required? electronic balance measuring cylinder stopwatch thermometer A ✓ ✓ × ✓ B ✓ × × ✓ C × ✓ × ✓ D ✓ × ✓ × 2 The apparatus shown was used to compare the rate of diffusion between gas J and air. A beaker containing the gas was placed over the porous pot. Which gas would cause bubbles to be observed in the beaker of water? A carbon monoxide B ethane C helium D sulfur dioxide gas J porous pot water air beaker

3 [Turn over 3 A paper chromatogram was prepared using a mixture of coloured substances. After drying, the chromatogram is shown. Which statement is correct? A Locating agents are always needed to interpret a chromatogram. B The chromatography paper must have been placed with the solvent above level Z. C The substance at level X has a lower Rf value than the substance at level Y. D The substance at level X is more soluble than the substance at level Y in the solvent. 4 The graph shows the change in temperature with time when steam is cooled from 120 °C to ‒20 °C. Which row shows the correct change taking place between different points of the graph? points change A P to Q kinetic energy of particles remains constant B Q to R water boiling C R to S volume of liquid is decreasing D T to U water freezing temperature/°C 120 time/s ‒20 P Q / R S T U solvent front start line

4 5 Particles of four elements are shown. Ne10 20 N7 15 3– O8 16 2– F9 17 ‾ Which statement about all four particles is correct? A They have the same number of electrons. B They have the same number of neutrons. C They h