St Gabriels 2024 Prelims 4NA Sc(Chem) P3

St. Gabriel’s Secondary School 2024 ‘N’ Preliminary Examination Subject : Science (Chemistry) Paper No. : 5105/03 Level/Stream : Sec 4 Normal (Academic) Duration : 1 hour 15 minutes (for Papers 3 and 4) Date : 7 August 2024 Additional Material: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, register number and class clearly in the spaces above. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number 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. 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 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 complete Paper 3. Any rough working should be done in this question paper. A copy of the Periodic Table is printed on page 8. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination hand in your answers to Paper 3 and Paper 4 separately. This question paper consists of 8 printed pages including this cover page. Name: ………………………………………… ( ) Class: Sec ………………..

SGSS/Sc(Chem)/P3/4NA/Prelim/2024 2 1 Which apparatus is not needed to purify a sample of river water? 2 The diagrams below show two methods of collecting gases. Which row gives the properties of a gas which can be collected by both methods? property 1 property 2 A insoluble in water denser than air B insoluble in water less dense than air C soluble in water denser than air D soluble in water less dense than air 3 The table shows the boiling points of some of the elements present in air. Which elements are liquid at -200 °C? A argon, helium and neon B argon, nitrogen and oxygen C helium and neon only D nitrogen and oxygen only

SGSS/Sc(Chem)/P3/4NA/Prelim/2024 3 4 The graph shows a cooling curve of liquid Z. Which diagram correctly shows the arrangement of particles in Z at ‒5°C? A B C D 5 A student claims that liquid P is pure bromine. Which is the best method for him to test the purity of liquid P? A determine its boiling point B filter the liquid C see the colour of the liquid D test the pH of the liquid 6 85Z and 87Z are isotopes of an element Z. How is the ion formed by 85Z different from the ion formed by 87Z? A It has 2 less neutrons and 2 less electrons. B It has 2 less neutrons and same number of electrons. C It has 2 less protons and 2 less electrons. D It has 2 less protons and same number of electrons.

SGSS/Sc(Chem)/P3/4NA/Prelim/2024 4 7 A sodium atom is represented as 23 11Na . How many electrons does one atom of sodium contain? A 11 B 12 C 23 D 34 8 The diagram shows the arrangement of electrons, neutrons and protons in a particle of substance Q. What is the overall charge present in particle Q? A 3– B 0 C 3+ D 9+ 9 The ‘dot and cross’ diagram shows a molecule formed between atoms X and Y. Which statement is incorrect? A Atom X shares two of its valence electrons with each atom Y. B Atom X forms two covalent bonds with each atom Y. C The structural formula of the molecule is Y=X=Y. D This compound has high melting and boiling point. X Y Y

SGSS/Sc(Chem)/P3/4NA/Prelim/2024 5 10 The diagram shows two electrical circuits. Which could be X and Y? X Y A aluminium bromine solution B calcium oxide mercury C lead molten sodium chloride D sulfur water 11 The chemical formulae of copper(I) sulfide and hydrogen phosphate are C u2S and H 3PO4 respectively. What is the likely chemical formula of copper(I) phosphate? A CuPO4 B Cu2PO4 C Cu3PO4 D Cu4PO 12 The diagram shows a molecule of vinyl chloride. What is the formula of vinyl chloride? A C2H3Cl B C2HCl3 C CH3Cl2 D CH2Cl3 13 The properties of an element and its compounds can be predicted from its position in the Periodic Table. Which property cannot be predicted in this way? A The acidic or basic nature of the oxide. B The charge on its ion. C The formula of its oxide. D The number of isotopes it has. solid X liquid Y lamp lamp battery battery

SGSS/Sc(Chem)/P3/4NA/Prelim/2024 6 14 Which statement about the ions of the Group 17 elements is correct? A All the ions contain an odd number of electrons. B All the ions contain more electrons than protons. C All the ions contain more protons than neutrons. D All the ions have seven valence electrons. 15 One type of fossil fuels contains carbon, hydrogen, oxygen, sulfur and nitrogen. Which pollutant from the burning of this fossil fuel will result in damage to buildings made of limestone? A ammonia B carbon dioxide C methane D sulfur dioxide 16 Gas A produces a white precipitate when bubbled into limewater. 1 It can react with aqueous sodium hydroxide. 2 It can react with hydrochloric acid. 3 It can turn damp blue litmus paper red. Which statements are true of gas A? A 1 and 2 only B 1 and 3 only C 2 and 3 only D All of the above 17 The two statements are about the fractional distillation of crude oil. Statement 1: Fractional distillation is used to separate crude oil into useful fractions. Statement 2: The useful fractions with lower boiling points are found at the top of the fractionating column. Which best explains the above statements? A Both statements are correct and statement 2 explains 1. B Both statements are correct but statement 2 does not explain statement 1. C Statement 1 is correct but statement 2 is incorrect. D Statement 1 is incorrect but statement 2 is correct. 18 Which of the following equations does not represent an addition reaction? A C6H6 + 3H2 → C6H12 B C2H4 + Br2 → C2H4Br2 C C2H6 + Cl2 → C2H5Cl + HCl D C2H4 + H2 → C2H6

SGSS/Sc(Chem)/P3/4NA/Prelim/2024 7 19 Some information about poly(ethene) is given. • Poly(ethene) is used to make plastic bags. • Poly(ethene) plastic bags in landfill sites do not readily decompose. • Poly(ethene) molecules contain only carbon and hydrogen atoms. Which statement about poly(ethene) is correct? A It is biodegradable. B It is combustible. C It is unsaturated. D It reacts with water. 20 Which is the main source of biofuel? A crude oil B natural gas C plastic D sugar cane

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