NYGH 2020-S3EOY-IP Chem P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS' HIGH SCHOOL End-of-Year Examination 2020 Secondary Three Chemistry Paper 1 Multiple Choice 45 minutes Wednesday 07 October 2020 1130-1215 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, 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 13. Setter: KO This document consists of 13 printed pages and 1 blank page. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2020 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: KO Chemistry/ Paper 1 1 The diagrams below show the arrangement of particles of the same substance but at different temperatures. at 10 oC at 60 oC Which one of the following is most likely to be the substance represented above? melting point /oC boiling point /oC A – 50 – 10 B – 10 0 C 0 50 D 20 80 2 A copper(II) sulfate crystal is left in a beaker of water as shown below. After several days, a homogenous blue colouration was observed throughout the contents of the beaker. What are the particles that moved to result in the blue colouration? A copper(II) ions and sulfate ions only B copper(II) ions and water molecules only C water molecules and copper(II) sulfate molecules D copper(II) ions, sulfate ions and water molecules 3 Which process is suitable for obtaining the water from an aqueous solution of sugar? A crystallisation B distillation C filtration D use of a separating funnel

2020 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setter: KO Chemistry / Paper 1 [Turn over 4 What is the correct order of separating a mixture of the following solids, to obtain a pure sample of each compound? • potassium chloride • barium sulfate • iodine A sublimation, dissolving, filtering, evaporation B sublimation, dissolving, distillation, evaporation C dissolving, evaporation, filtering, sublimation D dissolving, distillation, sublimation, evaporation 5 When heated strongly in a hard glass test tube, ammonium chloride decomposes as follows: NH4Cl ! NH3 + HCl What happens to the moist red litmus paper? A remains red B turns blue C turns blue then red again D bleaches moist red litmus paper ammonium chloride

2020 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: KO Chemistry/ Paper 1 6 A student wants to carry out an experiment to follow the rate of reaction between hydrochloric acid and marble chips. Which set-ups are suitable for this experiment? 1 2 3 4 A 1 and 2 B 2 and 3 C 1 and 4 D 1, 2 and 3 7 An indicator changes colour according to the table below. pH colour 0 – 3 red 4 – 7 brown 8 – 14 purple Which pair of solutions can be distinguished by this indicator? A aqueous ammonia and potassium hydroxide B aqueous calcium chloride and water C aqueous potassium nitrate and potassium hydroxide D dilute sulfuric acid and dilute hydrochloric acid hydrochloric acid and marble chips hydrochloric acid and marble chips measuring cylinder hydrochloric acid and marble chips balance gas syringe marble chips burette hydrochloric acid

2020 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setter: KO Chemistry / Paper 1 [Turn over 8 Which statement about amphoteric oxides is not correct? A They dissolve in water. B They are all metallic oxides. C They react with aqueous hydrochloric acid to give salts. D They react with aqueous sodium hydroxide to give salts. 9 Which of the following sets of reagents is suitable for preparation of lead(II) sulfate? A lead, sulfuric acid B lead(II) carbonate, sulfuric acid C lead(II) oxide, nitric acid, sodium sulfate D lead(II) chloride, nitric acid, sodium sulfate 10 Separate tests on a sample of polluted water from a factory gave the following results. reagent added observation(s) barium nitrate followed by nitric acid white precipitate, insoluble in acid nitric acid followed by aqueous ammonia white precipitate, soluble in excess aqueous ammonia What compound could have been present in the polluted water? A zinc carbonate B aluminium sulfate C zinc sulfate D aluminium carbonate 11 Which of the following pairs of reagents when added together will have the following ionic equation? Ca2+(aq) + SO42– (aq) → CaSO4(s) I aqueous calcium hydroxide and aqueous ammonium sulfate II aqueous calcium nitrate and aqueous sodium sulfate III aqueous calcium nitrate and dilute sulfuric acid IV aqueous calcium hydroxide and sulfuric acid A I and IV B II and III C I, II and III D I, II, III and IV

2020 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: KO Chemistry/ Paper 1 12 A solution of a fertiliser was tested as shown. Which ions must be present in the fertiliser? A Fe2+, Ca2+ and NO3– B Fe3+, Zn2+ and NO3– C Fe2+, Ca2+ and NH4+ D Fe3+, Zn2+ and NH4+ 13 In an experiment, 20.0 cm3 of 1.0 mol dm–3 of aqueous iron(III) nitrate was mixed with 30 cm3 of 1.0 mol dm–3 of aqueous sodium hydroxide. What would you observe when the reaction was complete? A a green precipitate and a pale green solution B a green precipitate and a colourless solution C a reddish-brown precipitate and a yellow solution D a reddish-brown precipitate and a pale green solution 14 An element X forms an ion with a charge of 2+. 0.65 g of a metal X can completely react with 20 cm3 of 1.0 mol dm–3 of hydrochloric acid. What is the relative atomic mass of this metal X? A 23.0 B 32.5 C 55.8 D 65.4 fertiliser solution excess sodium hydroxide solution green and white precipitate seen filtered to obtain filtrate heat moist red litmus paper turns blue

2020 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setter: KO Chemistry / Paper 1 [Turn over 15 In a steel making process, the impurity P4O10 is removed by reacting it with calcium oxide. The only product of this reaction is the salt calcium phosphate, Ca3(PO4)2. In this reaction, how many moles of P4O10 react with three moles of calcium oxide? A 0.5 mol B 1.0 mol C 1.5 mol D 3.0 mol 16 5.00 g of a fertiliser containing ammonium sulfate was dissolved in water and diluted to 250 cm3. 25.0 cm3 of this solution was added to an excess of sodium hydroxide solution. The reaction between ammonium sulfate and sodium hydroxide is given by the following equation: (NH4)2SO4 + 2NaOH → Na2SO4 + 2H2O + 2NH3 The ammonia produced was bubbled into 50.0 cm3 of 0.0500 mol dm–3 sulfuric acid solution. The resulting solution then required 25.80 cm3 of 0.100 mol dm–3 sodium hydroxide solution for complete neutralisation. What is the percentage by mass of ammonium sulfate (Mr = 132.1) in the fertiliser? A 10.6% B 16.0% C 32.0% D 40.0% 17 Chlorine gas is a severe irritant to the eyes and respiratory system. The maximum safe toleration level of chlorine gas in air is 0.00495 mg dm–3. [1 g = 1000 mg] How many chlorine atoms are present in 500 cm3 of air at this to