NYGH 2015-S3EOY-IP Chem P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2015 Secondary Three Chemistry Paper 1 Multiple Choice 45 minutes Wednesday 7 October 2015 0800-0845 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the Multiple Choice Answer Sheet provided. There are thirty questions in 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 Multiple Choice Answer Sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of approved scientific calculators is allowed. A copy of the periodic table is found on page 9. Setters: LSC This document consists of 9 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over]

2015 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: LSC Chemistry [Turn Over] 1 The atmosphere of Venus contains mainly oxygen, argon and nitrogen. The melting and boiling points of these gases are shown in the table below. gas melting point/oC boiling point/oC oxygen -219 -183 argon -189 -186 nitrogen -210 -196 If only liquid oxygen is to be obtained, while the other gases may remain in the solid or gaseous states, what temperature should the sample of air be decreased to? A -180oC B -185oC C -187oC D -198oC 2 Which statements are correct about a gas? I Its particles move at a low speed. II It is easily compressed. III It has a higher rate of diffusion compared to a liquid. IV Its particles spread throughout the container. A I and II only C II and IV only B II, III and IV only D I, II, III and IV 3 When a sample of impure naphthalene was heated, the sample was found to melt over a temperature range of 69oC to 76oC. What could be the melting point of naphthalene? A 69oC C 76oC B 72oC D 80oC 4 Which of the following shows the correct order of processes that should be carried out to obtain solid iodine, sand and sodium chloride from a mixture of these three solids? A evaporation, sublimation, dissolving, filtration B sublimation, dissolving, filtration, evaporation C dissolving, filtration, sublimation, evaporation D sublimation, filtration, dissolving, evaporation 5 Which of the following statements about a strong acid and a weak acid is true? A Blue litmus paper turns red in the presence of a strong acid while it remains blue in a weak acid. B A strong acid has a higher concentration of hydrogen ions as compared to a weak acid when both acids are of the same concentration and basicity. C A larger volume of hydrogen gas is given out when a strong acid of the same concentration as the weak acid, reacts with a reactive metal. D Phosphoric acid is a strong acid because it is a tribasic acid while hydrochloric acid is a weak acid since it is monobasic.

2015 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: LSC Chemistry [Turn Over] 6 Which of the following chemicals can be added to dilute hydrochloric acid to prepare copper(II) chloride? A copper metal C copper(II) sulfate B copper(II) nitrate D copper(II) carbonate 7 Which of the following best describes acidic oxides and amphoteric oxides? A Acidic oxides are all gases but amphoteric oxides are all solids. B Acidic oxides react with bases but amphoteric oxides react with both acids and bases. C Acidic oxides are covalent compounds while amphoteric oxides are either covalent or ionic compounds. D Acidic oxides are soluble in water while amphoteric oxides are insoluble in water but soluble in organic solvents. 8 Which of the following pairs of substances cannot react with each other? A aqueous sodium hydroxide and zinc oxide B limewater with aqueous ammonium sulfate C dilute nitric acid with calcium hydrogencarbonate D aqueous potassium chloride with magnesium oxide 9 Which of the following is/are correct about an aqueous solution of sodium hydroxide? I it produces ammonia when heated with aluminium II a colourless solution is formed when it is added in excess to lead(II) oxide III it forms a brown precipitate with aqueous iron(III) chloride A I and II only C III only B II and III only D I, II, and III 10 Substance X is a solid at room temperature. When calcium carbonate is added to an aqueous solution of X, a gas that forms a white precipitate with limewater is formed. What is the identity of substance X? A citric acid C aluminium oxide B hydrogen chloride D sodium hydroxide 11 Which of the following is the best conductor of electricity if an equal number of moles of each substance is dissolved in the stated volume of water? A ammonia in 500 cm3 of water B ethanoic acid in 1 dm3 of water C hydrogen chloride in 500 cm3 of water D potassium hydroxide in 1 dm3 of water

2015 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: LSC Chemistry [Turn Over] 12 Which of the following methods listed below cannot be effectively used to prepare the respective gases? method gas evolved A add hydrochloric acid to lead hydrogen B add sulfuric acid to magnesium hydrogen C warm limewater with ammonium sulfate ammonia D warm alkaline sodium nitrate with aluminium ammonia 13 When aqueous ammonia was added in excess to an aqueous solution of salt Z, a green precipitate which turned brown on exposure to air was formed. Which one of the following could be Z? A FeCO3 C FeSO4 B Fe2(CO3)3 D Fe2(SO4)3 14 Solution S reacts with aqueous lead(II) nitrate to form a white precipitate that is insoluble in dilute nitric acid. Which anions are likely to be in solution S? I carbonate ion II chloride ion III iodide ion IV sulfate ion A I and II only C II and IV only B I, II and IV only D I, II, III and IV 15 Which of the following would be observed when an aqueous solution containing aluminium, copper(II), and zinc ions was treated with an excess of aqueous ammonia? A white precipitate in blue solution B blue precipitate in colourless solution C white precipitate in colourless solution D blue precipitate in blue solution 16 Urea, CO(NH2)2, is one of the fertilisers manufactured from ammonia. How many pairs of electrons are shared in a molecule of urea? A 3 C 7 B 4 D 8

2015 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: LSC Chemistry [Turn Over] 17 Silicon carbide and diamond are both macromolecules having similar structures. Which of the following is an INCORRECT description of the two substances? A both substances are hard B both substances are compounds C both substances have high melting points D both substances are non-conductors of electricity 18 100 cm3 of gaseous ammonia contains n molecules. How many atoms are there in 100 cm3 of gaseous hydrogen under the same temperature and pressure? A n C 1.5n B 2n D 2.5n 19 Two moles of ethanol, C2H5OH, have the same mass as one mole of an oxide of nitrogen, N2OX. What is the value of x? A 1 C 3 B 2 D 4 20 Which of the following statements regarding helium and hydrogen are correct? I 4 atoms of hydrogen have the same mass as 1 atom of helium. II 4 g of helium gas has the same number of atoms as 2 g of hydrogen gas. III 2 moles of helium gas have t