NYGH 2016-S3EOY-IP Chem P1

Class Register Number Name NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2016 Secondary Three Chemistry Paper 1 Multiple Choice 45 minutes Wednesday 5 October 2016 0845-0930 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 11. Setters: KXY This document consists of 11 printed pages and 1 blank page. NANYANG GIRLS’ HIGH SCHOOL [Turn over]

2016 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: KXY Chemistry [Turn Over] 1 When a balloon filled with helium gas is left alone for a few days, it no longer floats in the air but s inks to the floor and look s deflated. Which of the following best explains this phenomenon? A Air diffused into the balloon. B Helium gas became denser than air. C Helium gas diffused out of the balloon. D Helium gas diffused out of the balloon faster than air diffused in. 2 Buckminsterfullerene, C60, sublimes at 600°C. Below is a temperature against time graph when buckminsterfullerene is cooled from 1000°C to 25°C. Which of the following options best describes the movement of the particles from Y to Z? A Carbon atoms are sliding past one another. B Carbon molecules are sliding past one another. C Carbon atoms are vibrating in fixed positions. D Carbon molecules are vibrating in fixed positions 3 The following table gives some information on substance X and Y: substance melting point / °C boiling point / °C density / g cm-1 solubility in water X 40.5 181.7 1.07 soluble Y −38.8 674.11 2.65 insoluble Which one of the following method is most suitable for separating a mixture of X and Y at room temperature? A decantation B filtration C separating funnel D simple distillation Time / s

2016 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: KXY Chemistry [Turn Over] 4 Which of the following properties is separation by paper chromatography based on? A colours B densities C boiling points D solubilities in the same solvent 5 An accident occurred in a factory and some nitric acid was spilled. Which substance, when added in excess, neutralises the acid without leaving behind an alkaline solution? A aqueous ammonia B calcium carbonate C sodium hydroxide D water 6 The following table gives some information on different pH indicators: indicator colour at pH 1 pH at which colour changes colour at pH 14 congo red blue 5 red bromothymol blue yellow 6 blue phenophthalein colourless 10 red What colours would be observed if each of these indicators were added separately to samples of pure water? congo red bromothymol blue phenolphthalein A blue yellow red B blue blue red C red yellow colourless D red blue colourless 7 When fully dissociated, one mole of a compound X gives four moles of ions in solution. X reacts with ammonium carbonate to give an acidic gas. What is compound X? A aluminium hydroxide B calcium hydroxide C phosphoric acid D ethanoic acid 8 What is the most suitable method to prepare a pure sample of zinc chloride? A titrate zinc hydroxide with hydrochloric acid B add zinc metal in excess to hydrochloric acid C add zinc carbonate to excess hydrochloric acid D add zinc nitrate solution to sodium chloride solution

2016 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: KXY Chemistry [Turn Over] 9 Which of the following options uses the correct reagents to prepare the desired salt? salt reagents A calcium nitrate calcium chloride and nitric acid B lead(II) chloride lead(II) nitrate and silver chloride C silver sulfate silver and sulfuric acid D magnesium carbonate magnesium nitrate and potassium carbonate 10 To prepare a sample of blue copper(II) sulfate crystals, Jane thought of this procedure: 1. Add copper(II) hydroxide in excess to sulfuric acid. 2. Filter to remove excess solids. 3. Heat the filtrate to dryness to get the crystals. What is the problem with her procedure? A Instead of copper(II) hydroxide, copper should be used. B Copper(II) hydroxide should not be added in excess. C There is no need to filter to remove excess solids. D Instead of evaporation to dryness, crystallisation should be used. 11 When an acid is added to an unknown substance, effervescence was observed. When this gas is bubbled in limewater, white precipitate was observed. How would this gas affect moist litmus papers? I turns moist red litmus paper blue II turns moist blue litmus paper red III moist red litmus paper remains red IV moist blue litmus paper remains blue A I and II B I and IV C II and III D III and IV 12 In an experiment, 8.0 cm3 of 1 mol dm-3 of sodium hydroxide solution is added to 6.0 cm3 of 1 mol dm-3 of copper(II) sulfate solution. What are the expected observations? A a colourless solution only B a blue precipitate and a blue solution C a blue precipitate and a colourless solution D a white precipitate and a colourless solution

2016 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: KXY Chemistry [Turn Over] 13 When sodium hydroxide is added dropwise to a sample of solution X, a white precipitate Y is formed. Y dissolved in excess sodium hydroxide. The test is repeated with aqueous ammonia, and a white precipitate Z which is soluble in excess aqueous ammonia was formed. What are the identities of Y and Z? Y Z A Zn2+ Zn2+ B Al3+, Pb2+, Zn2+ Zn2+ C Zn(OH)2 Zn(NH4)2 D Zn(OH)2 Zn(OH)2 14 The flowchart below shows the results of a qualitative analysis of solution X, which is a mixture of more than one type of salts. The same tests were also conducted on solutions R, S and T, which contained the respective ions: R: K+, NH4 + and CO3 2- S: K+, CO3 2- and NO3 - T: NH4 +, CO3 2- and NO3 - Which of the solution(s) would share the same observations as Solution X? A T only B S and T only C R and T only D R, S and T

2016 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: KXY Chemistry [Turn Over] 15 Two tests were conducted on a sample of sodium carbonate: I Add nitric acid, followed by a few drops of barium chloride. II Add a few drops of barium chloride, followed by nitric acid. Which of the following describes the expected observations of tests I and II? I II A no observable change with nitric acid and barium chloride no observable change with barium chloride and nitric acid B no observable change with nitric acid; white precipitate formed with barium chloride white precipitate formed with barium chloride, insoluble in nitric acid C effervescence observed with nitric acid; no precipitate was formed with barium chloride no precipitate was formed with barium chloride; effervescence observed with nitric acid D effervescence observed with nitric acid; no precipitate was formed with barium chloride white prec