Peirce Sec 5105 4N Prelim 2022 P3 and P4 with ANS

This paper consists of 9 printed pages and 1 blank page. Setter: Mr Tan Kok Heong Class Register No. Candidate Name PEIRCE SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR NORMAL (ACADEMIC) SCIENCE (CHEMISTRY) 5105/03, 5107/03 Paper 3 (Multiple Choice) 26 July 2022 Papers 3 and 4: 1 hour 15 minutes Additional Materials: Multiple Choice Answer Sheet, Periodic Table READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number on the Answer Sheet in the spaces provided unless it has been done for you. 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. Read the instructions on the Answer Sheet very carefully. Answers to Paper 3 and Paper 4 must be handed in separately. Each correct answer will score one mark. A mark will not be ded ucted for a wrong answer. You are advised to spend no longer 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. The use of an approved scientific calculator is expected, where appropriate. www.KiasuExamPaper.com 154

2 1 Which substance is a gas at 28°C? melting point/°C boiling point/°C A −54 45 B −21 23 C 32 78 D 43 123 2 Some students are asked to de scribe the differences between gases and liquids. Three of their suggestions are: 1. gas molecules are further apart than liquid molecules 2. gas molecules are bigger than liquid molecules 3. gas molecules move freely but liquid molecules vibrate aro und fixed positions Which suggestion(s) is/are correct? A 1 o n l y B 2 o n l y C 3 o n l y D 1, 2 and 3 3 Which method is used to obtain a sample of pure salt crystals from a solution of the salt? A crystallisation B distillation C evaporation D filtration www.KiasuExamPaper.com 155

3 4 A student makes some crystals. How should the student test the purity of the crystals? A colour of crystals B melting point of crystals C size of crystals D solubility of crystals 5 Compounds contain two or more elements chemically combined. Which list contains only compounds? A C H 4 C l2 NaCl B C H 4 H 2 H 2O C C l2 C O H 2O D H C l H 2O H 2SO4 6 The diagrams show the arrangement of particles in four substan ces. R S T U Which row correctly describes these four substances? R S T U A compound compound element element B element compound mixture mixture C element element compound mixture D mixture mixture compound compound www.KiasuExamPaper.com 156

4 7 The table below shows the number of protons, electrons and neu trons of four different particles. particle number of protons number of electrons number of neutrons W 19 18 18 X 15 15 18 Y 20 18 20 Z 15 15 16 Which pair of particles are isotopes? A W and X B W and Y C X and Y D X and Z 8 The electronic structures of atoms X and Y are shown. key electron nucleus X and Y react to form a covalent compound. What is its formula ? A X Y B X 2Y C X Y 2 D X 2Y2 www.KiasuExamPaper.com 157

5 9 Which row shows the general properties of an ionic compound? melting point soluble in water conducts electricity solid liquid A high no no yes B high yes no yes C low no no no D low yes yes yes 10 Ethane, C 2H6, burns as shown. 2C2H6 + …O2 → 4CO2 + 6H2O Which number of oxygen molecules balances the equation above? A 6 B 7 C 1 0 D 1 4 11 Carbon, 12 6 C, and sulfur, 32 16S, form the compound carbon disulfide, CS2. What is the relative molecular mass, Mr of carbon disulfide? A 6 + 16 B 6 + (2 × 16) C 12 + 32 D 12 + (2 × 32) 12 Which of the following contai ns both an acidic oxide and a basic oxide? A carbon dioxide and carbon monoxide B carbon monoxide and magnesium oxide C sulfur dioxide and magnesium oxide D zinc oxide and water www.KiasuExamPaper.com 158

6 13 Ammonium chloride is heated with substance X. Ammonia gas is g iven off. What type of substance is X? A a c i d B base C metal D s a l t 14 Which salt is best prepared by precipitation? A barium nitrate B calcium carbonate C potassium chloride D sodium carbonate 15 Which property do all metals have? A They conduct electricity. B They have a grey or silver colour. C They have high density. D They have high melting points. www.KiasuExamPaper.com 159

7 16 An iron nail is placed in a closed test-tube, containing gas X. The nail rusts. What is gas X? A argon B carbon dioxide C n i t r o g e n D oxygen 17 Which trends occur when moving down Group I of the Periodic Table? melting point speed of reaction with water A decrease decrease B decrease increase C increase decrease D increase increase gas X nail water www.KiasuExamPaper.com 160

8 18 Some properties of Group VII elements are shown. Group VII melting point/°C boiling point/°C fluorine −220 −118 chlorine −101 Y bromine X 59 iodine 114 184 What could be the values of X and Y? X Y A −150 −35 B −150 103 C −7 −35 D −7 103 19 Which place on the map is most likely to be producing large qu antities of sulfur dioxide? sea river farm A coal-fired power station B water purification plant C petrol station in village D www.KiasuExamPaper.com 161

9 20 The diagram shows a fractionating column. From which level of the column is the substance used for making roads obtained? crude oil heater A B C D www.KiasuExamPaper.com 162

10 B L A N K P A G E www.KiasuExamPaper.com 163