CCHY Chem Prelim P1 P2 with ans

This document consists of 19 printed pages, INCLUDING the cover page. [Turn over 2024 Preliminary Examination Secondary Four Express CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 23 August 2024 Additional Materials: OTAS 1 hour READ THESE INSTRUCTIONS FIRST Write your name, class and index number in the spaces at the top of this page and on the OTAS provided. 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 OTAS. Read the instructions on the OTAS 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 question paper. A copy of the Periodic Table is printed on page 19. The use of an approved scientific calculator is expected, where appropriate. O CHUNG CHENG HIGH SCHOOL (YISHUN)

2 2024 CCHY Preliminary Examination Chemistry (6092/01) / Sec Four Express [Turn over 1 In a volumetric experiment involving the addition of hydrochloric acid to 25.0 cm 3 of aqueous sodium hydroxide, it is necessary to determine when the reaction is just complete. Which piece of apparatus could be used to determine the end -point of the reaction? A electronic balance B gas syringe C stopwatch D thermometer 2 Which diagram shows the arrangement of particles inside a balloon containing helium and oxygen? helium oxygen A B C D

3 2024 CCHY Preliminary Examination Chemistry (6092/01) / Sec Four Express [Turn over 3 A 50 cm3 sample of ethanol is mixed with 50 cm3 of water. The volume of the mixed ethanol and water is found to be 97 cm 3. Which statement is the best explanation? A Some volatile ethanol evaporate. B The ethanol molecules fit into gaps between water molecules. C Water and ethanol react to form a soluble salt. D Water and ethanol react to form a gas which escapes. 4 A beaker of nitrogen was inverted over a porous pot containing carbon monoxide as shown. The water level did not change. What is the reason for this? A Both gases are diatomic. B Nitrogen is an unreactive gas. C The two gases have the same molecular masses. D The gas particles are too large to pass through the porous pot. nitrogen carbon monoxide beaker porous pot water 50 cm3 of ethanol 50 cm3 of water

4 2024 CCHY Preliminary Examination Chemistry (6092/01) / Sec Four Express [Turn over 5 In an experiment to find the formula of magnesium oxide, magnesium metal is heated in a covered crucible. Why is the crucible covered? A