Bowen 5105 Sci Chemistry Paper 3

Class Full Name Index Number PRELIMINARY EXAMINATION 2023 I believe, therefore I am SCIENCE (CHEMISTRY) Paper 3 Multiple Choice Secondary 4 Normal Academic Additional materials: Multiple Choice Answer Sheet Papers 3 and 4: 1 hour 15 minutes 28 July 2023 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number on all the work you hand in. 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 completed Paper 3. Any rough working should be done in the booklet. A copy of Periodic Table is printed on page 9. The use of an approved scientific calculator is expected, where appropriate. DO NOT OPEN THIS PAPER UNTIL YOU ARE TOLD TO DO SO For Examiner’s Use This document consists of 9 printed pages, including the cover page and a copy of Periodic table N 5105/5107/03 20

2 [Turn over 1. Substance X and substance Y are compounds found in a food sample . Both are liquids at room temperature with different boiling points. Which of the following is the most suitable method to separate a mixture of X and Y to obtain each substance respectively? A C B D 2. Which statement shows that a sample of water is pure? A It has no effect on both red and blue litmus papers. B It is colourless and odourless. C It boils exactly at 100°C. D It has a density of 1g/dm3.

3 [Turn over 3. The table below shows information about three different substances. substance decompose upon heating solubility in water solubility in alcohol P no no no Q no no yes R yes yes no Which of the following shows the correct steps to take to separate and obtain a sample of substance R from a mixture of these three substances? A dissolving the mixture in alcohol → filtration → evaporation to dryness B dissolving the mixture in alcohol → filtration → crystallisation C dissolving the mixture in water → filtration → evaporation to dryness D dissolving the mixture in water → filtration → crystallisation 4. Which statement best expla ins why carbon dioxide gas does not have a fixed volume and can be compressed easily? A The attractive forces between the particles are weak. B The particles are able to move freely and randomly at high speeds. C There are a lot of spaces between the particles. D The particles are far apart and packed in an orderly manner. 5. The boiling points of a few elements are shown below. element boiling point/°C P -141 Q 50 R 134 A mixture of elements P, Q and R is heated gradually from -160°C to 99°C. Which substance(s) would remain as a liquid at 99°C? A element P C element Q and P B element R D element P and R

4 [Turn over 6. X is an atom with atomic number 13 and mass number 27. Which of the following correctly shows the number of protons, neutrons and electrons of a X3+ ion? number of protons number of neutrons number of electrons A 13 14 10 B 13 27 10 C 14 13 13 D 14 14 16 7. The electronic configuration of elements X and Y are shown below. X: 2.8.2 Y: 2.5 Which of the following correctly shows the type of bonding and chemical formula of the compound formed between X and Y? type of bonding chemical formula A covalent X2Y3 B covalent X3Y2 C ionic X2Y3 D ionic X3Y2 8. Which pair of substances will react to produce a gas that forms white precipitate in limewater? substance 1 substance 2 A nitric acid magnesium metal B hydrochloric acid barium sulfate C sulfuric acid sodium carbonate D nitric acid calcium hydroxide

5 [Turn over 9. Which of the following oxides can react with both acids and alkalis? A zinc oxide C carbon monoxide B sulfur dioxide D copper (II) oxide 10. The diagram below shows the pH ranges of three indicators, X, Y and Z. The three indicators are mixed together in a beaker. A few drops of this mixture was added into a solution, and the solution turned yellow. What is the pH value of the solution? A pH 2 C pH 4 B pH 8 D pH 10 11. Which of the following best represents nitrogen and oxygen present in air? 12. Which of the following solutions, when mixed, form an insoluble salt? A barium nitrate and sodium chloride B calcium nitrate and hydrochloric acid C lead (II) nitrate and sulfuric acid D sodium nitrate and magnesium chloride A B C D

6 [Turn over 13. The diag ram shows a piece of steel wool inside a test tube. The test tube is inverted in water, trapping air inside. Rusting begins to occur. What could the water level be after several days? 14. The table shows the results of halogen displacement experiments. halogen added halide X- halide Y- halide Z- X2 -- no reaction no reaction Y2 displacement takes place -- displacement takes place Z2 displacement takes place no reaction -- Which of the following halogens could represent X, Y and Z respectively? X Y Z A chlorine bromine iodine B iodine chlorine bromine C chlorine iodine bromine D iodine bromine chlorine

7 [Turn over 15. Which st atement best explains why potassium and francium are placed in the same group of the Periodic Table? A Both elements contain one electron at the outermost shell. B Both elements form ionic compounds with group VII elements. C Both elements have high melting and boiling points. D Both elements have low density and are able to float on water. 16. Which of the following el ements is used in filling of tubes for glowin g advertising lamps? A hydrogen C helium B neon D nitrogen 17. The diagram shows an outline of the Periodic table. Which of the following shows a correct statement regarding elements D, E, F and G? A F has the same number of electron shells as G and D. B F has 7 valence electrons while G has 1 valence electron. C D is more reactive than G. D G and D are more metallic in nature compared to F and E. E F G D

8 [Turn over 18. Octane is an alkane present in petrol. What are the products obtained when octane is completely burnt in air? A carbon monoxide and water C carbon dioxide and water B carbon and carbon monoxide D carbon dioxide and hydrogen 19. The diagrams show the structures of three hydrocarbons. Which hydrocarbons belong to the same homologous series? A P and Q C Q and R B P and R D P, Q and R 20. Which fraction, from the dis tillation of petroleum, is used as feedstock for the petrochemical industry? A Bitumen C Kerosene B Lubricating oil D Naphtha - End of paper - P Q R

9 [Turn over