NYGH 2012-S3BT2-Chem

Class Register Number Name 南洋女子中学校 NANYANG GIRLS' HIGH SCHOOL BLOCK TEST 2 Secondary Three CHEMISTRY 1 hour Thursday 5th July 2012 1030 - 1130 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. Please note that if you do not write your answers in the spaces provided specially for that purpose, that section of the paper will be awarded ZERO marks. Choice) Section A (15 MCQ) This section consists of 15 multiple choice questions. Choose the best answer and write its letter in the space provided on page 2 of the Question Paper. Section B (Structured) Answer all questions in the spaces provided on the Question Paper. Section C (Free-Response) Answer all questions in the spaces provided on the Question Paper. Submit Sections A, B and C together. INFORMATION FOR CANDIDATES The intended number of marks is given in the brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 12. Topics to be tested: Particulate nature of matter/ Kinetic particle theory Atomic structure and separation technique Chemical bonding Mole concept Examiner’s Use Section A (15 marks) Section B (20 marks) Section C (10 marks) Total (45 marks) Setter: C.W. This document consists of 12 printed pages. NANYANG GIRLS' HIGH SCHOOL [ Turn over]

2012 Block Test 2 Nanyang Girls’ High School Secondary Three Setter: C.W. Chemistry 2 Section A (15 Marks) Answer the questions (1-15) by filling the answer in the table below. 1 6 11 2 7 12 3 8 13 4 9 14 5 10 15 Section B (20 marks) Answer all questions in this section in the spaces provided. B1 (a) State the structure of diamond and tin(IV) iodide in the table above. [2] Substance Structure of substance Diamond Carbon dioxide Simple molecular structure Tin(IV) iodide (SnI4) Copper Metal lattice (b) Explain why carbon dioxide has a low melting point while diamond has a high melting point. [3]

2012 Block Test 2 Nanyang Girls’ High School Secondary Three Setter: C.W. Chemistry [Turn Over] 3 (c) Explain why copper conducts electricity in the solid state. [1] (d) Draw the “dot-and-cross” diagram to show the bonding in tin(IV) iodide. Show only the valence electrons. [1] (e) Draw the “dot-and-cross” diagram to show the bonding in carbon dioxide. Show only the valence electrons. [1] B2 Dichloromethane (CH2Cl2) was detected on a fibre found in a crime scene. A mass spectrometer was used to analyze the dichloromethane and it showed that the two chlorine isotopes, chlorine-35 and chlorine-37, were