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