NYGH 2017-S3EOY-IP Chem P2

Class Register Number Name NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2017 Secondary Three CHEMISTRY Paper 2 Theory Paper 1 hour 45 minutes Wednesday 4 October 2017 1045 - 1230 Additional materials: Writing paper 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 and on any separate answer paper used. Section A (40 marks) Answer all questions. Write your answers in the spaces provided on the question paper. Section B (30 marks) Answer all questions including questions B8, B9 and B10 Either or B10 Or. Write your answers on the separate writing paper provided. At the end of the examination, 1. Fasten all your work securely together; 2. Circle B10 Either (for Either) or B10 Or (for Or) in the grid on the right to indicate the question you have answered; 3. Hand in Section A and Section B separately. INFORMATION FOR CANDIDATES The intended number of marks is given in the brackets [ ] at the end of each question or part question. You are advised to spend no longer than 60 minutes on Section A and no longer than 45 minutes on Section B. The use of approved scientific calculators is allowed. A copy of the periodic table is found on page 15. Paper 1 / 30 Paper 2 Section A / 40 B8 / 10 B9 / 10 B10 Either / B10 Or / 10 Total / 100 Setters: CDT / CWJ This document consists of 15 printed pages and 1 blank page. NANYANG GIRLS’ HIGH SCHOOL [Turn over]

2017 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: CDT/CWJ Chemistry Section A (40 marks) Answer all questions. Write your answers in the spaces provided. A1 A colourless liquid was left on a chemistry laboratory table. Arthur collected the colourless liquid and conducted a few tests on it. (a) He collected a drop of the colourless liquid and used paper chromatography with water as the solvent. He obtained the following chromatogram with 3 spots, with the help of a locating agent. Suggest what can be deduced about the solubility of the three spots in water. [1] (b) Arthur then heated a sample of the colourless liquid until it completely boiled, while measuring its temperature. Suggest and explain what he would observe in the readings obtained. [2] Total [3] spot A spot B spot C

2017 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: CDT/CWJ Chemistry [Turn Over] A2 Calcium and sulfur are two elements in the Periodic Table. (a) State the number of protons and valence electrons of a sulfur atom. [2] number of protons number of valence electrons (b) The two elements react to form calcium sulfide. (i) Draw a Lewis diagram to show the bonding in calcium sulfide. [1] (ii) Explain if you would expect calcium sulfide to conduct electricity at room temperature, referring to its