GESS 3EXP CHEM EYE P1 2023

This paper consists of 14 pages including the cover page GAN ENG SENG SCHOOL End-of-Year Examination 2023 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Sec 3 Express 6092/01 11 October 2023 1 hour Additional Materials: OTAS Calculators are allowed in the examination. READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the OTAS. 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 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 booklet. A copy of the Periodic Table is found on page 14. Total Marks 40

GESS 3EXP CHEM P2 EYE 2023 TKG 2 1 Which apparatus is most suitable for measuring 22.15 cm3 of sodium hydroxide? A beaker B burette C measuring cylinder D pipette 2 In the experimental set-up shown below, sulfur dioxide was reacted with oxygen to form sulfur trioxide by passing the mixture through heated platinised asbestos (a substance that speeds up the reaction). What is the function of concentrated sulfuric acid? A to acidify the mixture B to act as a drying agent C to act as a medium for the two reactant gases to mix D to remove impurities 3 The apparatus below shows the method to collect gas X. Which properties of gas X can be deduced? A denser than air B insoluble in water and denser than air C less dense than air D soluble in water and less dense than air

GESS 3EXP CHEM P2 EYE 2023 TKG 3 4 A mixture contains solid Y mixed with ethanol. Solid Y is insoluble in ethanol. Ethanol is an alcohol that has a boiling point of 78 ºC and Y has a boiling point of 103 ºC. Which of the following apparatus represents the best method used to obtain both solid Y and ethanol? A B C D 5 Megan performed chromatography on some ink samples. The chromatogram below was obtained. What could Megan have done wrong in her experiment? A the initial spots of ink were too small B the ink samples were insoluble in the solvent chosen C the starting line was drawn with a pen D the solvent level was above the starting line

GESS 3EXP CHEM P2 EYE 2023 TKG 4 6 The diagram shows the chromatogram obtained by analysis of a single dye. Which of the following is the correct Rf value of spot B? A 0.231 B 0.350 C 0.412 D 0.538 7 The diagram below shows the spacing of the particles in a substance Z at two different temperatures.