ACSI 2020 Y3 IP Chemistry FYE

Anglo-Chinese School (Independent) Year 3 Integrated Programme Final Examination 2020 CHEMISTRY PAPER 1 Wednesday 30th September 2020 1 hour Additional material: OTAS answer sheet INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Shade your Candidate Number on the OTAS answer sheet in the spaces provided. 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 soft pencil on the OTAS answer sheet. INFORMATION FOR CANDIDATES There are forty questions in this paper, carrying a total of 40 marks. A copy of the Periodic Table is printed on page 2. Electronic calculators may be used. This booklet consists of 13 printed pages, including this cover page.

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Page 3 of 36 1 Which substance would undergo two changes of state when heated from -20C to 65C? substance melting point / C boiling point / C A. -18 60 B. -24 18 C. -115 56 D. 42 108 2 Which of the following statements about a pure substance during boiling is correct? A. The distance between the particles increases. B. The kinetic energy of the particles increases. C. The size of the particles increases. D. The strength of the forces of attraction between the particles increases. 3 The models and formulae for some molecules are shown below. R2S4 ST Which is the correct model for a molecule of a compound formed between R and T? A. B. C. D.

Page 4 of 36 4 What is the total number of atoms in 36.04 g of water molecules? A. 3.01 x 1023 atoms B. 9.03 x 1023 atoms C. 12.04 x 1023 atoms D. 36.12 x 1023 atoms 5 Which of the following contains the greatest number of ions? A. 10.0 cm3 of 2.5 mol dm-3 of K2CO3 solution B. 20.0 cm3 of 2.0 mol dm-3 of KNO3 solution C. 30.0 cm3 of 1.5 mol dm-3 of K2SO4 solution D. 40.0 cm3 of 1.0 mol dm-3 of K3PO4 solution 6 200 cm 3 of water is added to 50 .0 cm3 of 4 g dm-3 aqueous ammonium nitrate, NH4NO3. What is the new molar concentration of the ammonium nitrate solution? A. 0.0100 mol dm-3 B. 0.0125 mol dm-3 C. 1.28 mol dm-3 D. 1.60 mol dm-3 7 15 cm3 of ethane burns in 35 cm3 of oxygen to form carbon dioxide and water. 2C2H6 (g) + 7O2 (g) ⎯→ 4CO2 (g) + 6H2O (l) What is the total volume of gases remaining after the reaction? All gas volumes are measured at room temperature and pressure. A. 20 cm3 B. 25 cm3 C. 30 cm3 D. 100 cm3

Page 5 of 36 8 0.175 g of a dibasic acid requires 25.0 cm 3 of 0.200 mol dm-3 of aqueous sodium hydroxide to react completely. What is the molar mass of the acid? A. 22.0 g mol-1 B. 35.0 g mol-1 C. 44.0 g mol-1 D. 70.0 g mol-1 9 Dinitrogen tetraoxide, N2O4, is a liquid at room temperature and pressure. The following statements were made about dinitrogen te