NYGH 2011-S3EOY-Chem P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2011 Secondary Three CHEMISTRY 45 Minutes Paper 1 Multiple Choice 08 00 to 08 45h Thursday 13 October 2011 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. No mark will be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the Periodic Table is found on page 10. Setter: SChew This document consists of 10 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2011 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setter: SChew Chemistry/I 1 The apparatus below can be used to extract propanone,C 3H6O, (boiling point 56oC) from a solution of propanone containing plant dyes. During the separation process, the plant dyes A are collected as the distillate. B react to form a colourless product. C remain in the flask. D are removed by the cooling water. 2 Two liquids, dichloromethane and water, are separated using separating funnel. Dichloromethane is drained off first. Which statement about dichloromethane is correct? A It is miscible with water and is denser than water. B It is immiscible with water and is less dense than water. C It is miscible with water and is less dense than water. D It is immiscible with water and is denser than water. 3 The table shows four elements, W, X, Y and Z with their atomic numbers. Element W X Y Z Atomic Number 6 8 11 17 What are the likely formulae of ionic compounds and covalent compounds formed from the above elements? Ionic Compound of formula Covalent compound of formula A WX YZ B Y 2X WX2 C YW WZ4 D YZ ZX 4 The following properties of compound R were given in a chemistry report written by a student. Which property shows that R contains ionic bonds? A R has high melting and boiling points. B Solid R dissolves in water. C Solid R does not conduct electricity. D Molten R conducts electricity but solid R does not.

2011 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School X X X YX + Z 5 Element X is a gas at room temperature and pressure. It reacts with calcium metal to form a white solid with the chemical formula Ca 3X2. Which of the following is a possible electronic confi