NYGH 2013-S3EOY-Chem P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2013 Secondary Three CHEMISTRY 1 hour 45 minutes Paper 2 Theory Paper 0915 - 1100 Wednesday 9th October 2013 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 8, 9 and 10 Either or 10 Or. Write your answers on the separate writing paper provided. At the end of the examination, 1. fasten all your work securely together; 2. tick 10 Either (for Either) or 10 Or (for Or) next to the number 10 in the grid below to indicate which question you have answered. INFORMATION FOR CANDIDATES Examiner’s Use Section A Section B 8 9 10 Either 10 Or Total 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 one hour on Section A and no longer than 45 minutes on Section B. Setters: CHG/LXT/MI This document consists of 13 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2013 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: LXT/CHG/MI Chemistry /II Section A Answer all questions. Write your answers in the spaces provided. A1 The names of some compounds are given below. carbon monoxide ammonium sulfate magnesium carbonate potassium hydroxide lead(II) iodide lead(II) nitrate aluminium oxide methane ethanoic acid Select from the above list, substance(s) that fit(s) the following descriptions. Each name may be used once, more than once or not at all. [4] (a) a salt which is prepared by precipitation _______________________ (b) two solutions, which, when added together and warmed, will produce a gas that turns moist red litmus paper blue _______________________ and _______________________ (c) a substance that dissolves in water, forming a solution which causes Universal Indicator to turn orange _______________________ Total [4] A2 Methylamine, CH 3NH2, is a derivative of ammonia, in which one H atom in ammonia is replaced by a CH3 group. (a) Draw a Lewis dot diagram to show the electronic arrangement of methylamine. [1]

2013 End- of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: CHG/LXT/MI Chemistry /II [Turn over (b) As with ammonia, methylamine reacts with acids to form a salt only. In a reaction, it was found that 0.0250 mol of methylamine reacted completely with 20.0 cm3 of 0.0625 mol/dm3 of acid Q. Show, by calculations, the basicity of acid Q. [2]