Science (Chemistry) 5105/03 OR 5107/03 Kranji Secondary School 2024

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 symbol Ni28 59 . How many neutrons does this nickel atom contain? A 28 B 31 C 59 D 87 6 Which of the following diagrams does not represent a mixture? A B C D 7 The ‘dot-and-cross’ diagram shows a molecule of methanol. Which of the following statements is false? A Each carbon atom shares four electrons in total. B Each hydrogen atom only forms one bond. C The chemical formula of methanol is CH4O. D There is a double bond between the carbon and oxygen atom. 8 An oxide of nitrogen NxOy has a relative molecular mass of 92. What are the values of x and y? x y A 1 1 B 1 2 C 2 4 D 4 4

4 9 What are the charges of the ions in Fe2(CO3)3? Fe CO3 A 2- 3+ B 2+ 3- C 3- 2+ D 3+ 2- 10 An incomplete word equation is given. hydrochloric acid + metal carbonate → salt + P + water What is P? A carbon dioxide B hydrogen C metal hydroxide D oxygen 11 The oxide of element R dissolves in water to form a solution of pH 3. What could be a possible identity of R and the type of oxide it forms? element R type of oxide A copper acidic B iron basic C nitrogen acidic D zinc amphoteric 12 The diagram below shows part of the Periodic Table of elements. Which two elements have the same number of electron shells? A W and Y B V and X C V and Y D X and Z X V Y W Z

5 [Turn over 13 Which is a property of all metals? A They conduct electricity. B They have high melting points. C They react readily with oxygen. D They react vigorously with water. 14 A student carried out experiments on three different metals with cold water and steam. They recorded their results in the following table. metal with cold water with steam R no reaction hydrogen formed S no reaction no reaction T hydrogen formed hydrogen formed What is the order of reactivity of the metals? most reactive least reactive A R S T B S R T C T R S D T S R 15 Which of the following methods is the least effective in preventing an iron nail from rusting? A Coating the iron nail with oil B Galvanising the iron nail with zinc C Painting the iron nail D Washing the iron nail with water 16 Which row describes the main processes in the carbon cycle correctly? give(s) out carbon dioxide take(s) in carbon dioxide A combustion photosynthesis, respiration B combustion, respiration photosynthesis C photosynthesis combustion, respiration D photosynthesis, respiration combustion 17 Which statement describes a homologous series? A All compounds have different chemical properties. B All compounds have the same general formula. C All compounds have the same names. D All compounds have the same physical properties.

6 18 A student makes the following statements about biofuels. 1 Biofuels can be made from natural gas. 2 Biofuels can be made from plants. 3 Biofuels have no impact on the environment. Which of the statements is/are true? A 2 only B 1 and 2 C 2 and 3 D 1, 2 and 3 19 Propane reacts with chlorine under UV light according to the following reaction. C3H8 + Cl2 → C3H7Cl + HCl What type of reaction is this? A addition B combustion C cracking D substitution 20 Which diagram represents an unsaturated hydrocarbon? A B C D

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