NYGH 2013-S3EOY-Chem P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2013 Secondary Three Chemistry Paper 1 Multiple Choice 45 minutes Wednesday 9th October 2013 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 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. Setter: ET This document consists of 12 printed pages. NANYANG GIRLS’ HIGH SCHOOL

2013 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setter: ET Chemistry / I 1 The approximate pH values of aqueous solutions of four s ubstances commonly used in cooking are shown. Which substance could be taken to neutralize excess acid in the stomach? Substance pH A baking soda 9 B salt 7 C lemon juice 4 D vinegar 3 2 In which reaction is hydrochloric acid not behaving as an acid? A HCl(aq) + AgNO3(aq) → AgCl(s) + HNO3(aq) B 2HCl(aq) + CaCO3(aq) → CaCl2(aq) + CO2 (g) + H2O(l) C 2HCl(aq) + Fe(s) → FeCl2(aq) + H2 (g) D 6HCl(aq) + Fe2O3(s) → FeCl3(aq) + 3H2O(l) 3 Which of the following are true about calcium hydroxide solution? 1 It conducts electricity. 2 It liberates ammonia gas when heated with an ammonium salt. 3 It turns Universal Indicator red. 4 It liberates carbon dioxide fr om sodium carbonate solution. A 1 and 2 only B 1 and 3 only C 3 and 4 only D 1, 2 and 3 only

2013 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setter: ET Chemistry / I [Turn over 4 A titration experiment bet ween two aqueous solutions, X and Y was carried out. The pH value of the solution was monitored using the data logging. A graph of pH of the solution against the volume of X was plotted as shown. What are the possible identities of X and Y? X Y A Na 2CO3 KOH B HCl KOH C H2SO4 CaCO 3 D NH3 HNO 3 5 Salt PQ is to be prepared by reacting the carbonate of P with the acid HQ. The titration method is to be used to carry out the preparation. What are the solubilities of the carbonate, the acid and the salt? The carbonate of P The acid HQ The salt PQ A insoluble soluble insoluble B insoluble soluble soluble C soluble insoluble insoluble D soluble soluble soluble 6 Which of the following does not show the appropriate reagent s used for the preparation of the named salts? Salt Reagents A Lead(II) sulfate Lead(II) carbonat e + Hydrochloric acid B Barium sulfate Barium ni trate + Sulfuric acid C Sodium nitrate Sodium hydroxide + Nitric acid D Magnesium chloride Magnesiu m + Hydrochloric acid volume of X added pH 13 7 1

2013 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setter: ET Chemistry / I 7 Neymar was given an unknown fertiliser X. He conducted several tests and his observations are shown below.  Dissolving X in water and mixing the resultant solu tion with acidified silver nitrate gave a white precipitate.  Dissolving X in water and mixing the resultant so lution with acidified barium nitrate did not give a white precipitate.  Adding X to a beaker of aqueous lithium hydrox ide and warming the mixture gave a gas which turns moist litmus paper blue. Which compound would be X? A ammonium sulfate B ammonium chloride C calcium chloride D calcium sulfate 8 As shown below, a student performed a number of tests on an aqueous solution of lead(II) nitrate. Which test must be repeated because the student's observation was wrong? Test Observation A Add aqueous sodium hydroxide and aluminium foil. Warm gently. A gas was given off which turned red litmus paper blue. B Add aqueous zinc sulfate. A white precipitate was formed. C Add aqueous barium chloride. A yellow precipitate was formed. D Add aqueous sodium hydroxide. A white precipitate was formed. 9 In an experiment, 2.00 cm 3 of 1.00 mol/dm 3 aqueous copper(II) sulf ate was mixed with 4.00 cm3 of 1.00 mol/dm3 aqueous ammonium carbonate. The chemical equation for this reaction is shown below. CuSO4 + (NH4)2CO3 → (NH4)2SO4 + CuCO3 What did the reaction flask contain after the reaction was completed? A green precipitate and a blue solution B white precipitate and a blue solution C green precipitate and a colourless solution D a colourless solution only

2013 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setter: ET Chemistry / I [Turn over 10 Three products are formed when sodium ca rbonate solution is added to a beaker of dilute hydrochloric acid, as shown by the equation below. Na2CO3 + 2HCl → 2NaCl + CO2 + H2O Which will be the results for tests carried out on the products? Reaction with calcium nitrate solution Moist red litmus paper A No visible reaction Remains red B No visible reaction Turns blue C White precipitate formed Remains red D White precipitate formed Turns blue 11 In a chemistry experiment, solution X is gradually added to a salt solution Y, followed by addition of nitric acid solution. The graph shows how the mass of the precipitate formed changes with the addition of the different solutions. Which of the following would produce the graph shown above? Solution X Ions present in salt solution Y A aqueous silver nitrate sulfate ion and carbonate ion B aqueous silver nitrate nitrate ion and carbonate ion C aqueous barium nitrate iodide ion and carbonate ion D aqueous barium nitrate sulfate ion and carbonate ion total volume of solutions added to salt solution Y addition of dilute nitric acid addition of solution X Mass of precipitate

2013 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setter: ET Chemistry / I 12 The apparatus below consists of a porous pot containing a gas X which is then surrounded by a gas Y in a beaker. Which one of the following pairs of gases would cause an upward movement of the liquid in the right-hand limb of the U-tube? Gas X Gas Y A H 2 NH 3 B NH3 CO 2 C O2 H 2 D O2 CO 2 13 Plugs of cotton wool soaked respecti vely in concentrated aqueous ammonia and concentrated hydrochloric acid are inserted at the same time into the open ends of a horizontal tube as shown in th e diagram below. The ends of the tube are sealed. After a short lapse of time, a white deposit of ammonium chloride is observed. xxx xxx xxx xxx xxx xxx xxx xxx Where is the solid deposit likely to be observed? 14 Which one of the following w ould be the most suitable met hod for separating mixture of methylbenzene (boiling point 111 oC) and cyclohexane (boiling point 81oC)? A evaporation B fractional distillation C filtration D sublimation Concentrated aqueous ammonia Concentrated hydrochloric acid A B C D beaker porous pot U-tube containing an inert liquid

2013 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setter: ET Chemistry / I [Turn over 15 Hydrogen chloride is very solubl e in water, whereas chlorine is only slightly sol