kss comb chem 2024 prelim p3

Candidate Name: __________________________ ( ) Class: _______ KRANJI SECONDARY SCHOOL Preliminary Examination Secondary 4 Normal (Academic) SCIENCE (CHEMISTRY) 5105/03 Paper 3 Multiple Choice 5107/03 Papers 3 and 4 Friday 2 August 2024 1 hour 15 minutes KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI Additional Materials: Multiple Choice Answer Sheet INSTRUCTIONS TO CANDIDATES There are twenty 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 to be correct and record your choice in soft pencil on the OMR provided. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to spend no more than 30 minutes on Paper 3. You may proceed to answer Paper 4 as soon as you have completed Paper 3. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 7. The use of an approved scientific calculator is expected, where appropriate. Set by: Mr Joel Lee This Question Paper consists of 7 printed pages and 1 blank page. [Turn over 4NA Session 1

2 1 A student wishes to add exactly 15.8 cm3 of alkali to exactly 25.0 cm3 of acid. Which apparatus should the student use to measure these volumes? alkali acid A burette beaker B burette pipette C measuring cylinder pipette D pipette burette 2 The diagram below shows a chromatogram obtained from three different samples of food colouring, X, Y and Z. yellow red green green yellow yellow red red Sample X Sample Y Sample Z How many different yellow dyes are present in the samples? A 1 B 2 C 3 D 4 3 Which of the following substances is a liquid at room temperature (25°C)? melting point/°C boiling point/°C A -117 10 B -20 80 C -5 15 D 35 120 4 Which of the following statements regarding liquids and gases is false? A Both gas and liquid particles are disorderly arranged. B Gas particles are much further apart than liquid particles. C Gas particles are much smaller than liquid particles. D When a liquid turns into a gas, its particles gain energy.

3 [Turn over 5 An atom of nickel is represented by the sy