SMSS 4NA Sc(Chem) Prelim 2023 P3

This document consists of 10 printed pages. ST. MARGARET’S SCHOOL (SECONDARY) Preliminary Examinations 2023 CANDIDATE NAME CLASS REGISTER NUMBER SCIENCE (PHYSICS,CHEMISTRY) SCIENCE (CHEMISTRY,BIOLOGY) Paper 3 Multiple Choice Secondary 4 Normal (Academic) 5105/03, 5107/03 17 August 2023 1 hour 15 minutes Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the cover page and on the Answer Sheet in the spaces provided. There are twenty 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 Answer Sheet. 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 had completed Paper 3. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 10. The use of an approved scientific calculator is expected, where appropriate.

2 SMS(S) 2023 1 The diagram shows a chromatogram obtained by using a coloured food dye. Which two colours are found in the food dye? A 1 and 2 B 2 and 3 C 2 and 5 D 3 and 4 2 Four pieces of apparatus are shown. Which apparatus is not used to measure the volume of a liquid? A B C D

3 SMS(S) 2023 3. A student wants to separate a mixture of sand and salt. The first step is to stir this mixture in a beaker of water. What are the next two steps? A crystallise, then carry out distillation B crystallise, then carry out evaporation C evaporate, then carry out distillation D filter, then crystallise 4 The graph shows a cooling curve of liquid Z. Which diagram correctly shows the arrangement of particles in Z at ‒5 oC? A B C D

4 SMS(S) 2023 5 A group of students wrote four statements about compounds and mixtures. 1 Compounds have fixed compositions. 2 Compounds have variable melting points. 3 Mixtures can be separated easily using physical methods of separation. 4 Mixtures have fixed melting points. Which statements are correct? A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4 6 Which particle has a relative charge of ‒1? A cation B electron C proton D neutron 7 Which pair of substances have the electronic configuration 2,8,8? A Ar and Al3+ B Cl‒ and Ca2+ C O2‒ and Li+ D S2‒ and Mg2+

5 SMS(S) 2023 8 The ‘dot and cross’ diagram shows a molecule formed between atoms X and Y. Which statement is incorrect? A Atom X shares 2 electrons with each atom Y. B Atom X forms two covalent bonds with each atom Y. C To form the molecule, atom X transfers two electrons to each atom Y. D The structural formula of the molecule is Y=X=Y. 9 Which substance is likely to be an ionic compound? melting point/ oC boiling point/ oC conductor of electricity in solid state A ‒102 ‒34 good B ‒102 ‒34 poor C 1535 2750 good D 1535 2750 poor 10 Sodium and rubidium are Group I elements. Which element has lower melting point and which element reacts less vigorously with water? lower melting point less vigorous reaction with water A rubidium rubidium B rubidium sodium C sodium rubidium D sodium sodium

6 SMS(S) 2023 11 The chart shows the colour ranges of four different indicators. Which indicator is blue in an acidic solution? 12 Which is a property of all metals? A good electrical conductivity B hard C high melting point D react with acid 13 Iron filings are placed in a damp test-tube containing air. The test-tube is placed in water and left for a week. The water rises up the test-tube after a week. Which substance did iron react with? A carbon dioxide B nitrogen C oxygen D water

7 SMS(S) 2023 14 The diagram shows apparatus used to test the reactivity of copper, magnesium and zinc with steam. Which metals react with steam to form hydrogen gas? copper magnesium zinc A    Legend: B     - reacts C     - no reaction D    15 The equation shows the reaction that occurs when ethanol burns in air. C2H5OH + xO2  yCO2 + zH2O What are the values of x, y and z that are needed to balance this equation? x y z A 2 2 2 B 2 2 3 C 2 3 3 D 3 2 3 16 Air is a mixture of gases. Which gas is present in the greatest amount in exhaled air? A carbon dioxide B hydrogen C nitrogen D oxygen

8 SMS(S) 2023 17 Which set of diagrams shows three substances that are all in the same homologous series? A B C D

9 SMS(S) 2023 18 The diagram shows a fractionating column. Which fraction is used for making roads? 19 Which reaction is an example of the cracking of an alkane? A 3C2H4  C6H12 B C6H12 + H2  C6H14 C C6H14  6C + 7H2 D C6H14  C2H4 + C4H10 20 Compound Y has the formula CH3CH2CH=CH2. Which row accurately describes Y? type of compound colour change when aqueous bromine is added A saturated red-brown to colourless B saturated colourless to red-brown C unsaturated red-brown to colourless D unsaturated colourless to red-brown

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