ACSI 2019 Y3 IP Chemistry FYE

This paper consists of 12 printed pages. Anglo-Chinese School (Independent) Year 3 Integrated Programme Final Examination 2019 CHEMISTRY PAPER 1 Monday 30th September 2019 TIME 1 hour Additional material: OTAS answer sheet INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Shade your Candidate Number on the OTAS answer sheet in the spaces provided. 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 OTAS answer sheet. INFORMATION FOR CANDIDATES There are forty questions in this paper, carrying a total of 40 marks. A copy of the Periodic Table is printed on page 2. Electronic calculators may be used.

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Page 3 of 32 1 Which of the following will increase the rate of diffusion? A. decrease in polarity of molecules B. decrease in relative molecular mass C. decrease in concentration gradient D. decrease in temperature 2 Which of the following statements is not true about freezing? A. A pure substance freezes at a constant temperature. B. Particles lose energy to the surrounding during freezing. C. Particles stop moving. D. Freezing is a physical process. 3 Which statement is true? A. N3– has the same number of electrons as P3–. B. S2– has the same number of electrons as K+. C. Ca2+ has more electrons than Ca. D. Na+ has more electrons than Mg2+. 4 Which particles are isoelectronic with one another ? [Q, R, S and T are not the actual chemical symbols.] A. Q8 14 2– and R10 19 B. R10 19 and T15 31 C. S11 23 2+ and R10 19 D. Q8 14 2– and S11 23 2+ 5 Which atom has a half-filled p sub-shell? A. Ne B. P C. F D. O

Page 4 of 32 7 Which formula represents the empirical formula of a compound? A. C2H4O B. C2H4O2 C. C6H12 D. H2O2 8 Which of the following hydroxides contains the smallest percentage of metal in one mole of the compound? A. Fe(OH)2 B. Ni(OH)2 C. Pb(OH)2 D. Mg(OH)2 9 The number of ions produced when 3.45 g of LiNO3 dissolves completely in water is A. 0.3 x 1023 B. 0.6 x 1023 C. 0.9 x 1023 D. 1.2 x 1023 10 4.00 g of solid sodium hydroxide is added to water to make a solution with a concentration of 0.200 mol dm-3. What is the volume of water used? A. 0.5 cm3 B. 20 cm3 C. 500 cm3 D. 2000 cm3 6 The electronic structures of atoms Q and R are shown. Q and R combine chemically to form an ionic compound. What is the formula of the compound? A. R7Q B. R4Q2 C. RQ D. RQ7

Page 5 of 32 11 Which compound contains both ionic and covalent bonds? A. MgC 2 B. HC C. CH3COOH D. NH4C 12 Three statements on metallic bonding are shown. I. They are electrostatic in nature. II. The metal ions are delocalised. III. Its strength is directly proportional to the magnitude of the charge of the ions. Which statement(s) is/are correct? A. I only B. I and II only C. I and III only D. II and III only 13 Which statement is correct for magnesium fluoride? A. It has low melting point. B. It can conduct electricity in all states. C. The electronic configuration of both ions in the compound is the same as neon. D. It is soluble in non-polar solvents. 14 Three substances have the properties shown. • X conducts electricity in solid and molten states. • Y is soluble in water and the solution conducts electricity. • Z only conducts electricity in molten state. What could be substance X, Y and Z? X Y Z A. Cu ZnO KOH B. Cu KOH ZnO C. ZnO Cu KOH D. ZnO KOH Cu 15 Which property do all metals have? A. They have high melting point. B. They form amphoteric oxides. C. They react with dilute acids. D. They conduct electricity.

Page 6 of 32 16 Which trend is correct down group 1 metals? A. atomic radius decreases B. density decreases C. electronegativity decreases D. melting point increases 17 When the species Br, Br + and Br – are arranged in order of increasing size, which is the correct order? A. Br < Br+ < Br– B. Br– < Br < Br+ C. Br+ < Br– < Br D. Br+ < Br < Br– 18 Aqueous sodium hydroxide and aqueous ammonia each give a white precipitate when added to aqueous zinc sulfate. What happens when an excess of each of these reagents is added? excess NaOH(aq) excess NH3(aq) A. precipitate dissolves precipitate dissolves B. precipitate dissolves precipitate does not dissolve C. precipitate does not dissolve precipitate dissolves D. precipitate does not dissolve precipitate does not dissolve 19 One of the tests for anion employs the use of acidified silver nitrate. The positive result is the presence of a white precipitate. What is the identity of the white precipitate? A. C – B. AgC C. SO42– D. Ag2SO4 20 Which reactants can be used to prepare the highest yield of lead(II) sulfate? A. Pb + H2SO4 B. PbCl2 + H2SO4 C. PbO + H2SO4 D. Pb(NO3)2 + H2SO4

Page 7 of 32 21 The solubility of three substances are shown. • P is sparingly soluble in water. • Q is soluble in water. • R insoluble in water. What could be the substances P, Q and R? P Q R A. Ca(OH)2 FeC 2 BaSO4 B. Ca(OH)2 FeCO3 BaSO4 C. Ba(OH)2 FeCO3 BaC 2 D. Ba(OH)2 FeC 2 BaC 2 22 The table below shows a series of tests done on substance F. Test Observations Adding excess NH3 (aq) to solution F Blue ppt. formed which dissolves in excess NH3 (aq) to form a deep blue solution. Heating solid F Decomposes to form an acidic brown gas Adding excess NaOH(aq) and A foil to solution F and warming it A pungent and colourless gas was evolved, which turns moist red litmus paper blue. What is substance F? A. CuBr2 B. Cu(NO3)2 C. FeBr2 D. Fe(NO3)2 23 Which salt is best prepared by titration? A. CuSO4 B. NaNO3 C. ZnC 2 D. CaCO3 24 Three positive tests for gases are shown. I. Moist blue litmus turns red. II. White ppt is observed in lime water. III. KMnO4 changes colour from purple to colourless. Which will be observed if the gas tested is carbon dioxide? A. I only B. II only C. I and II only D. II and III only

Page 8 of 32 25 Which compound would most commonly be added to soil to reduce its acidity? A. aluminium hydroxide B. calcium hydroxide C. magnesium hydroxide D. sodium hydroxide 26 A solution of hydrochloric acid, HC has a lower pH than a solution of methanoic acid,HCO2H, of the same concentration. Which statement(s) explain(s) this? I. HCO2H molecules dissociate to a greater extent than HC molecules do. II. HC is monobasic while HCO2H is dibasic. III. Methanoic acid is a weaker acid than hydrochloric acid. A. I only B. III only C. II only D. II and III only 27 100 cm3 of a solution with pH 3 is mixed with 100 cm3 of a solution with pH 5. What is the final pH of the resulting solution? A. 3.3 B. 3.7 C. 4.0 D. 4.3 28 Which statement about oxides is correct? A. A solution of magnesium oxide has a pH less than 7. B. Magnesium oxide reacts with nitric acid to make a salt. C. A solution of sulfur dioxide has a pH greater than 7. D. Sulfur dioxide reacts with hydrochloric acid to make a salt. 29 Which statement is always correct for an oxidation reaction? A. It involves the gain of oxygen by an element. B. It involves the loss of hydrogen by an element. C. The atom or ion being oxidised will gain electrons. D. The oxidation number of the element being oxidised will increase.

Page 9 of 32 30 Silver chloride decomposes to its elements when it is exposed to light. Which pair of half-equations is correct? half-equation Type of reaction I. Ag+ + e- → Ag oxidation II. Ag+ + e- → Ag reduction III. 2C - → C + 2e- oxidation IV. 2C - → C + 2e- reduction A. I and IV B. I and III C. II and III D. II and IV 31 Hydrogen sulfide can be oxidised to form