NYGH 2016-S3MYE-IP Chem

Class Register Number Name NANYANG GIRLS’ HIGH SCHOOL Mid-Year Examination 2016 Secondary Three CHEMISTRY 1 hour 30 minutes 0800-0930 Wednesday 11 May 2016 Additional materials: Writing papers READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page. Section A (MCQ) Write your name, class and register number on the Multiple Choice Answer Sheet provided. There are twenty 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. Section B (Structured) Answer All questions in the spaces provided on the Question Paper. Section C (Short Answer) Answer All questions in the spaces provided on the Question Paper. Submit Multiple Choice Answer Sheet and Question Paper separately. The intended number of marks is given in the brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 17. Examiner’s Use Section A (20 marks) Section B (30 marks) Section C (10 marks) Total (60 marks) Setters: LSC, CJS This document consists of 17 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over]

2016 Mid-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: LSC, CJS Chemistry Section A (20 marks) 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. 1 Different metals were added to dilute sulfuric acid. In which beaker will a reaction not take place? 2 Alex was stung by an insect with an alkaline sting. Which of the following substance is the most suitable for treating the insect sting? A vinegar B ethanol C tooth paste D cooking oil 3 Which of the following statements correctly describe a strong acid? I It has a high pH value. II It ionizes completely in water. III It has a high concentration of hydrogen ions. IV It exists as molecules in water. A I and II only B II and III only C I and IV only D III and IV only iron wire magnesium ribbon copper turning zinc powder A B C D

2016 Mid-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: LSC, CJS Chemistry [Turn Over] 4 Which two substances react to give a salt and water only? A iron and hydrochloric acid B potassium oxide and water C calcium carbonate and nitric acid D magnesium hydroxide and ethanoic acid 5 Which of the following gas when bubbled into water will give a pH greater than 7? A chlorine B hydrogen C ammonia D carbon monoxide 6 Which of the following solutions are correctly matched to their pH values? pH 1 2 7 9 11 A hydrochloric acid lemon juice sodium chloride household soap oven cleaner B lemon juice hydrochloric acid household soap oven cleaner sodium chloride C hydrochloric acid lemon juice sodium chloride oven cleaner household soap D lemon juice hydrochloric acid oven cleaner household soap sodium chloride 7 Ammonia gas is soluble in both water and trichloromethane, CHCl3. Which of the following shows the electrical conductivity for the two different solutions of ammonia? ammonia in water ammonia in trichloromethane A conducts electricity conducts electricity B conducts electricity does not conduct electricity C does not conduct electricity conducts electricity D does not conduct electricity does not conduct electricity

2016 Mid-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: LSC, CJS Chemistry 8 Which of the following is the correct ionic equation for the reaction between sodium carbonate and dilute sulfuric acid? A SO4 2–(aq) + 2Na+(aq) → Na2SO4(s) B CO3 2–(aq) + H2(g) → CO2(g) + H2O(l) C CO3 2–(aq) + 2H+(aq) → CO2(g) + H2O(l) D Na2CO3(s) + 2H+(aq) → 2Na+(aq) + CO2(g) + H2O(l) 11 Which of the following is true of amphoteric hydroxides? A They are soluble in water. B They are gases at room temperature. C They are insoluble in dilute nitric acid. D They react with aqueous sodium hydroxide to form salts. 12 Which of the following can be used to identify the solutions in two unlabel led reagent bottles, one of which is aqueous ammonium chloride and the other contains aqueous ammonium carbonate? A dilute nitric acid B aqueous ammonia C aqueous lead(II) nitrate D aqueous sodium hydroxide 9 Which of the following mixture undergoes a reaction with the following ionic equation? NH4 +(aq) + OH–(aq) → NH3(g) + H2O(l) A ammonium sulfate and limewater B ammonium carbonate and vinegar C ammonium nitrate and lead(II) hydroxide D aqueous ammonia and hydrochloric acid 10 Alison added a solid to dilute hydrochloric acid in her attempt to prepare zinc chloride but failed. Which of the following solid did she use? A zinc oxide B zinc metal C zinc nitrate D zinc carbonate

2016 Mid-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: LSC, CJS Chemistry [Turn Over] 13 An excess of aqueous sodium hydroxide is add ed to an aqueous solution of salt X and warmed. Ammonia gas is only given off after aluminium foil is added to the hot solution. What could X be? A sodium nitrate B sodium chloride C ammonium nitrate D ammonium chloride 14 The results of two separate tests conducted on an aqueous solution of a salt are shown in the table below. test results 1 Add aqueous ammonia dropwise then excess. A dark green precipitate which did not dissolve in excess of aqueous ammonia. Precipitate turned reddish brown on standing. 2 Add dilute nitric acid followed by aqueous barium nitrate. A white precipitate was formed. What is the identity of the salt? A iron(II) sulfate B iron(II) chloride C iron(III) sulfate D iron(III) chloride 15 The table below shows the observations obtained on salts X, Y and Z. salt tested colour of salt effect of adding aqueous sodium hydroxide dropwise till excess to a solution of the salt X white no precipitate formed and no gas evolved on warming the mixture Y green blue precipitate formed insoluble in excess Z white white precipitate formed insoluble in excess Which of the following contains the cations present in the three salts? X Y Z A sodium ion iron(II) ion lead(II) ion B sodium ion copper(II) ion calcium ion C ammonium ion iron(II) ion lead(II) ion D ammonium ion copper(II) ion calcium ion

2016 Mid-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: LSC, CJS Chemistry 16 Which of the following compound contains both ionic and covalent bonds? A zinc oxide B potassium sulfide C iron(II) chloride D calcium hydroxide 17 Which of the following covalent molecules does not form a solution containing mobile ions in water? A HCl B CH4 C CO2 D SO2 18 The table below shows electrical conductivity and melting points of thre e substances, P, Q and R. substance electrical conductivity melting point/ oC solid molten aqueous solution P no no no -117 Q no no no 80 R no yes yes 801 What are the types of bonding found in substances P, Q and R? P Q R A covalent metallic ionic B ionic covalent metallic C covalent covalent ionic D metallic ionic metallic

2016 Mid-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: LSC, CJS Chemistry [Turn Over] 19 The table below shows the number of electrons and neutro