SSS 5105, 5107 Prelim 2021 P3 final

5105, 5107/03/PRELIM/21 [Turn over SINGAPORE SPORTS SCHOOL PRELIMINARY EXAMINATION SECONDARY 4 NORMAL ACADEMIC ______________________________________________________________________ SCIENCE (CHEMISTRY) 5105/03, 5107/03 Paper 3 Multiple Choice 16 AUGUST 2021 Papers 3 and 4: 1 h 15 min Additional materials: Multiple Choice Answer Sheet _____________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your class, index number and name 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. Answers to Paper 3 and Paper 4 must be handed in separately. 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 10. The use of an approved scientific calculator is expected, where appropriate. This document consists of 9 printed pages and 1 blank page. CANDIDATE NAME CLASS INDEX NUMBER Mark: 20

2 5105, 5107/03/Prelim/21 [Turn over 1 1.50g of zinc powder is added to 50.0cm3 of hydrochloric acid. Which apparatus is used to measure the zinc and hydrochloric acid? zinc hydrochloric acid A electronic balance beaker B electronic balance burette C weighing scale beaker D weighing scale burette 2 The melting points and boiling points of pure substances W, X and Y are given in the table below. substance W X Y melting point / °C –114 44 –101 boiling point / °C 78 280 –34 The substances are chlorine, ethanol and phosphorus. Which row identifies W, X and Y? W X Y A chlorine phosphorus ethanol B ethanol chlorine phosphorus C ethanol phosphorus chlorine D phosphorus chlorine ethanol 3 Which method can be used to separate a mixture of water and ethanol? A chromatography B evaporation C filtration D fractional distillation

3 5105, 5107/03/Prelim/21 [Turn over 4 Which statement about an atom of oxygen-18, O8 18 , is correct? A It has more neutrons than protons. B It has more protons than electrons. C It has the same number of neutrons and electrons. D It has a total of 28 protons, neutrons and electrons. 5 A powdered solid G is grey with white specks. Water is added to it and this is stirred and filtered. Colourless liquid H and grey solid J are collected. J is attracted to a magnet. Which of the following describes G, H and J correctly? G H J A compound element mixture B element mixture element C mixture compound compound D mixture mixture element 6 The proton number of element M is 11. It is heated with oxygen. Which statement correctly describes the compound formed from this reaction of M and oxygen? A The compound is formed by sharing a pair of electrons between the atoms. B The compound formed is a solid at room temperature. C The compound formed conducts electricity in all states. D The compound formed melts easily when heated.

4 5105, 5107/03/Prelim/21 [Turn over 7 The compound magnesium nitrate has the formula Mg(NO3)2. What is the relative formula mass, Mr, of magnesium nitrate? A 80 B 134 C 148 D 172 8 Four solutions are separately tested with blue litmus paper and Universal Indicator. The results are shown below. solution result when tested with indicator blue litmus Universal indicator 1 blue blue 2 red red 3 red orange 4 blue green Which statement is correct? A Solutions 1 and 4 are acidic B Solutions 1 and 4 are alkaline. C Solutions 2 and 3 are acidic. D Solutions 2 and 3 are alkaline. 9 Which equation correctly shows the formation of a gas as a result of the reaction? A CuCO3(s) + 2HCl(aq)  CuCl2(aq) + H2O(l) + CO2(g) B Cu(s) + H2SO4(aq)  CuSO4(aq) + H2(g) C Ca(OH)2(aq) + CO2(g)  CaCO3(s) + H2O(l) D NaOH(aq) + HCl(aq)  NaCl(aq) + H2O(l)

5 5105, 5107/03/Prelim/21 [Turn over 10 Which statement about elements in Group VII of the Periodic Table is correct? A Their atoms have full valence shells. B They are all diatomic molecules. C They are all solids at room temperature. D They are all colourless gases. 11 An element E has an electronic structure of 2.8.5. The positions of four elements are shown in the Periodic Table below. Which element is found in the same period as E? 12 Strontium and magnesium belong to the same group in the Periodic Table. Which of the following shows the correct formula of strontium chloride? A SrCl2 B Sr2Cl C StCl2 D St2Cl

6 5105, 5107/03/Prelim/21 [Turn over 13 A student added dilute hydrochloric acid to four metals and recorded the results in the table below. test results metal gas given off 1 copper yes 2 iron yes 3 magnesium no 4 zinc yes There were some errors in his results. Which two results are correct? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 14 Which methods prevent iron from rusting? painting coating with grease coating with salt A     = prevents rusting B     = does not prevent rusting C    D    15 Which property is common for all metals? A They have high density. B They have high melting points. C They are difficult to cut. D They are good heat conductors.

7 5105, 5107/03/Prelim/21 [Turn over 16 Which of the following is true about a colourless, neutral gas produced from incomplete combustion of fuels? A It causes eye irritation in humans and animals. B It decreases pH of lakes and rivers. C It destroys leaves and roots of plants. D It prevents red blood cells from transporting oxygen. 17 The following gases pollute the atmosphere. 1 oxides of nitrogen 2 sulfur dioxide 3 methane Which gases contribute to acid rain? A 1 and 2 B 1 and 3 C 2 and 3 D 1, 2 and 3 18 Study the following flowchart on fuels. Which fuel is kerosene?

8 5105, 5107/03/Prelim/21 [Turn over 19 Which of the following compound is an alkene? A cyclohexene B chloromethane C ethanol D methane 20 A reaction of butane is shown below. What type of reaction is this? A addition B combustion C cracking D substitution ------- End of Paper ------

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