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