NYGH 2017-S3MYE-IP Chem

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 Section A Answer all questions. Choose the answer you consider correct and record your choice in the OAS sheet provided. 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 following solutions would have the lowest pH? A 1.0 mol dm-3 of hydrochloric acid B 1.0 mol dm-3 of sodium chloride C 1.0 mol dm-3 of ethanoic acid D 1.0 mol dm-3 of sodium hydroxide 7 Succinic acid is an organic acid. When burnt in excess oxygen, 0.150 mol of succinic acid produces 14.4 dm3 of carbon dioxide and 8.10 g of water. What is the formula of succinic acid? A C2H3O2 B C2H6O4 C C4H3O2 D C4H6O4 8 9.00 dm3 of impure hydrogen reacted with excess nitrogen to form 3.00 dm3 of ammonia. What is the percentage purity of the hydrogen sample? A 33.3% B 50.0% C 60.0% D 66.7%

2017 Mid-Year Examination Secondary Three IP Chemistry 4 Nanyang Girls’ High School Setter: MI, CT 11 The salt AB is prepared by reacting the carbonate of A with the acid HB. The titration method is used to prepare the salt. What are the solubilities of the carbonate, the acid and the salt? carbonate of A acid HB salt AB A insoluble soluble insoluble B insoluble soluble soluble C soluble insoluble insoluble D soluble soluble soluble 12 Which of the following salts can be prepared by crystallisation from an aqueous solution? A barium sulfate B lead(II) carbonate C potassium nitrate D silver chloride 13 Which of the following reactants can be used to safely prepare potassium chloride? A aqueous potassium hydroxide and dilute hydrochloric acid B aqueous potassium carbonate and aqueous sodium chloride C potassium metal and aqueous sodium chloride D potassium metal and dilute hydrochloric acid 14 Which pair of substances is used for making copper(II) sulfate? A copper and aqueous zinc sulfate B copper and dilute sulfuric acid C copper(II) carbonate and aqueous sodium sulfate D copper(II) oxide and dilute sulfuric acid 15 Hydrochloric acid is added to a beaker containing litmus solution. An excess of aqueous sodium hydroxide is then added to the mixture. What is one product of the reaction and what is the final colour observed in the mixture? product colour A hydrogen red B sodium chloride blue C carbon dioxide blue D sodium chloride red

2017 Mid-Year Examination Secondary Three IP Chemistry 5 Nanyang Girls’ High School Setter: MI, CT [Turn Over] 16 What is the most likely structural formula for the covalent compound S2Cl2? A Cl = S – S = Cl B Cl – S – S – Cl C S – Cl – Cl – S D S – Cl – S – Cl 17 The bonding in phosphoric acid can be represented by the structural formula shown. P O O O O H H H What is the total number of electrons shared between the phosphorus and oxygen atoms? A 5 B 8 C 10 D 16 18 Iodine has a higher boiling point compared to chlorine. Which statement best explains this? A Iodine is a solid and not a gas B Iodine has stronger covalent bonds in the molecule than chlorine C The intermolecular forces of attraction between the molecules in iodine are stronger than in chlorine D Chlorine molecules have a lower relative molecular mass than iodine molecules. 19 The proton number of phosphorus is 15. Which compound of phosphorus is likely to exist? 1 Na3P 2 PCl3 3 Ca3P2 A Compound 1 only B Compounds 1 and 2 only C Compounds 2 and 3 only D Compounds 1, 2 and 3

2017 Mid-Year Examination Secondary Three IP Chemistry 6 Nanyang Girls’ High School Setter: MI, CT 20 The formula of the compound formed by the sodium ion and the oxalate ion is Na2C2O4. Which of the following is most likely to be a correct chemical formula? A Al3(C2O4)2 B Ca2C2O4 C Fe(C2O4)2 D MgC2O4

2017 Mid-Year Examination Secondary Three IP Chemistry 7 Nanyang Girls’ High School Setter: MI, CT [Turn Over] B1 An excess of zinc carbonate was added to 10 cm3 of 0.5 mol dm-3 hydrochloric acid. The gas produced was collected via the displacement of water. (a) Calculate the maximum volume of gas at r.t.p. which could be produced in the reaction. [4] (b) The actual volume of gas collected was 50.6 cm3. (i) Calculate the percentage yield for this reaction. [1] (ii) Besides impure reactants and human error, suggest why the yield is less than 100%. [1] ………………………………………………………………… ………………………………………………………………… (iii) Suggest a modification to the setup of this reaction to increase its percentage yield. [1] ………………………………………………………………… Total [ 7 ] Section B Answer all questions. Write your answers in the spaces provided.

2017 Mid-Year Examination Secondary Three IP Chemistry 8 Nanyang Girls’ High School Setter: MI, CT (e) A Chemistry student from class 315 suggested that lead(II) chloride be prepared by reacting lead(I