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