NYGH 2017-S3MYE-IP Chem Ans

Class Register Number Name NANYANG GIRLS' HIGH SCHOOL Mid-Year Examination 2017 Secondary Three IP Chemistry CHEMISTRY 1 hour 30 minutes Monday 8 May 2017 0845 - 1015 READ THESE INSTRUCTIONS FIRST Write your class, register number and name in the spaces at the top of this page. Do not use paper clips, glue or correction fluid. There are 3 sections in this paper. Section A 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 the OAS sheet provided. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Section B and C Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. Candidates are advised to show all their working in a clear and orderly manner. A copy of the Periodic Table is on page 16. Section A (20 marks) Section B (30 marks) Section C (10 marks) Total (60 marks) Setter: MI, CT This document consists of 16 printed pages. NANYANG GIRLS' HIGH SCHOOL [Turn over

2017 Mid-Year Examination Secondary Three IP Chemistry 2 Nanyang Girls’ High School Setter: MI, CT 3 Nitrogen is an essential element required for protein synthesis in plants. Which of the following nitrogenous compounds listed below would provide the highest mass of nitrogen per 300 g of compound? A ammonium nitrate B urea, NH2CONH2 C ammonium phosphate D ammonium chloride 4 The molecular formula of aspirin is C9H8O4. A typical aspirin tablet contains 325 mg of C9H8O4. How many molecules of aspirin are in a tablet? (1 g = 1000 mg) A 0.00181 B 1.08 x 1021 C 5.85 x 1024 D 5.54 x 1025 5 Which one of the following is the molecular formula of a hydrocarbon containing 85.7% of carbon by mass? A CH4 B C2H4 C C3H8 D C4H10 1 Which of the following is the best method to collect gases less dense than air? A upward delivery B downward delivery C upward displacement of air D downward displacement of water 2 What is the mass of 1 tungsten atom? (Ar of tungsten = 183.8) A 1.10 x 10-26 g B 6.00 x 10-23 g C 3.06 x 10-22 g D 183.8 g

2017 Mid-Year Examination Secondary Three IP Chemistry 3 Nanyang Girls’ High School Setter: MI, CT [Turn Over] 6 What is the concentration of nitrate ions in a solution of 0.0500 mol dm-3 zinc nitrate? A 0.0500 mol dm-3 B 0.100 mol dm-3 C 0.150 mol dm-3 D 0.250 mol dm-3 9 Sulfuryl chloride gas, SO2Cl2, decomposes when heated to form sulfur dioxide gas and chlorine gas. What is the total volume of gases produced when 26.2 dm3 of sulfuryl chloride decomposes? A 13.1 dm3 B 26.2 dm3 C 52.4 dm3 D 78.6 dm3 10 Which of the