NYGH 2018-S3EOY-IP Chem P1

Class Register Number Name NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2018 Secondary Three Chemistry Paper 1 Multiple Choice 45 minutes Monday 8 October 2018 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, 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. Setter: CDT This document consists of 11 printed pages and 1 blank page. NANYANG GIRLS’ HIGH SCHOOL [Turn over]

2018 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setter: CDT Chemistry [Turn Over] 1 Which of the following substances A to D undergoes a physical change when cooled from 25 °C to 0 °C? substance melting point/°C boiling point/°C A −185 −165 B −25 5 C 50 250 D −5 65 2 A solid sample of octadecanoic acid (C17H35COOH) was heated until it started to melt. Which of the following statements best explains the shape of the graph at region Z? A There was no heat energy supplied by the electrical heater. B The molecules do not have any kinetic energy. C A chemical reaction occurred during the melting process. D Heat energy is used to overcome the attractive forces between the molecules. 3 Which of the following mixtures of substances can be separated using a separating funnel? A ammonium chloride in lead(II) nitrate solution B potassium iodide solution in organic solvent, trichloromethane, CHCl3(l) C D sodium nitrate and potassium nitrate in water zinc oxide in water 4 Lead(II) sulfate is soluble in hot water but almost insoluble in cold water. Which of the following methods is most suitable for obtaining a pure sample of lead(II) sulfate crystals from a flask containing a hot aqueous solution of lead(II) sulfate and sodium sulfate? A cool the mixture to room temperature, filter and collect the residue B heat the mixture and collect the substance which boils and condense it C cool the mixture, filter and evaporate the filtrate D heat the mixture and collect the substance in the flask time/ s temperature /oC Z

2018 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setter: CDT Chemistry [Turn Over] 5 The diagram below shows an experimental set-up for the preparation and collection of a pure and dry sample of a gas. Which of the following gases can be prepared and dried by this approach? A carbon dioxide, CO2 B hydrogen, H2 C hydrogen chloride, HCl D nitrogen dioxide, NO2 6 The table below shows information about four indicators used in acid-base titrations. indicator pH at which colour change takes place colour at low pH colour at high pH methyl orange 3.2 to 4.4 red yellow bromocresol green 3.8 to 5.4 yellow blue methyl red 4.8 to 6.0 red yellow bromothymol blue 6.0 to 7.6 yellow red Which set of indicators is most accurate in demonstrating that a solution has a pH between 4.5 and 4.7 when added to separate samples of the solutions? A bromocresol green B methyl red C methyl red and bromothymol blue D methyl red and methyl orange 7 Which of the following is a correct definition of a strong acid? A It reacts rapidly with weak bases in aqueous solution. B It reacts completely with weak bases in a neutralisation reaction. C It releases a large amount of heat when dissolved in water. D It ionises completely into mobile ions when dissolved in water. anhydrous calcium chloride, CaCl2

2018 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setter: CDT Chemistry [Turn Over] 8 The following are three reactions of dilute aqueous sulfuric acid. (1) H2SO4(aq) + MgO(s) → MgSO4(aq) + H2O(l) (2) H2SO4(aq) + 2K(s) → K2SO4(aq) + H2(g) (3) H2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2HCl(aq) In which of the reactions is sulfuric acid not behaving as an acid? A (1) only B (3) only C (1) and (2) only D (2) and (3) only 9 Which of the following options below shows the correct methods used to prepare the following salts? titration precipitation adding excess solid reactants A ammonium nitrate lead(II) sulfate sodium chloride B barium carbonate calcium sulfate magnesium chloride C barium sulfate ammonium chloride lead(II) nitrate D potassium nitrate silver iodide zinc sulfate 10 Which of the following ionic equations suggests that the transition metal oxide, MO, is amphoteric? A MO(s) + H2O(l) → M2+(aq) + 2OH−(aq) B MO(s) + 2OH−(aq) → MO22−(aq) + H2O(l) C MO(s) + 2H+(aq) → M2+(aq) + H2O(l) D MO(s) + 2NH4+(s) → M2+(s) + H2O(l) + 2NH3(g) 11 A bottle containing solid lead(II) hydroxide has been contaminated with some solid copper(II) hydroxide. How can lead(II) hydroxide be obtained from the mixture? A add boiling water to the mixture and filter B add aqueous ammonia to the mixture and filter C add warm dilute nitric acid to the mixture and filter D add warm aqueous sodium hydroxide to the mixture and filter

2018 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setter: CDT Chemistry [Turn Over] 12 A reaction scheme, starting with a colourless solution R, is shown below. R is a mixture that contains two cations and one anion. What are the ions in the colourless solution R? A lead(II), zinc and nitrate ions B aluminium, zinc and nitrate ions C ammonium, calcium and chloride ions D lead(II), ammonium and sulfate ions 13 Which of the following reagents can be used to differentiate Pb2+(aq) ions from Al3+(aq) ions? A NH3(aq) B H2SO4(aq) C NaOH(aq) D Ba(NO3)2(aq) 14 Each of the three substances were added to separate solutions of potassium nitrate and potassium carbonate. The three substances were: (1) (2) (3) aqueous ammonia aqueous silver nitrate aqueous hydrochloric acid Which of the following substances would give different observations when added to solutions of potassium nitrate and to potassium carbonate? A (1) only B (3) only C (1) and (2) only D (2) and (3) only excess aqueous NaOH precipitate soluble in excess aqueous NaOH to form a colourless solution colourless, pungent gas that turned moist red litmus paper blue aqueous KI aqueous NaOH + aluminium colourless solution R bright yellow precipitate

2018 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setter: CDT Chemistry [Turn Over] 15 Talc is an ionic mineral which when crushed forms talcum powder. It has the formula Mg3Si4O10(OH)2. What is the charge on the silicate group [Si4O10]? A 2+ B 4+ C 2_ D 4_ 16 Deuterium (chemical symbol D) is an isotope of hydrogen containing 1 neutron. It can be represented by the symbol D!!. Which of the following statements about deuterium oxide (‘heavy water’), D2O, is correct? A D2O has a molar mass of 18.0 g mol−1. B D2O turns anhydrous copper(II) sulfate blue. C D2O is a colourless gas at room temperature and pressure. D D2O molecules are linear. 17 An ion of element X has an electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 and a charge of 2+. It contains 48 neutrons. Which of the following shows a different isotope of element X? A 𝐗!"!" B 𝐗!"!! C 𝐗!"!" D 𝐗!"!! 18 Long single-walled carbon nanotubes have been synthesised by scientists in recent years. A short part of the struct