ACSI 2022 Promo Paper 1 questions

1 Anglo-Chinese School (Independent) Year 5 Promotional Examination 2022 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 1 Monday 12th September 2022 1 hour Additional materials: Multiple choice answer sheet Soft clean eraser Soft pencil (type 2B recommended) INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Shade your Candidate number on the multiple choice answer sheet provided. There are forty questions in this paper. Answer all the 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 multiple choice answer sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the periodic table is provided for reference on Page 2 of the examination paper. Calculators are not allowed to be used in this paper. This question paper consists of 19 printed pages, including the cover page.

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3 1. What is the mass of methane (CH4) that contains 4.80  1023 atoms of hydrogen? Avogadro's constant, NA: 6.02 x 1023 mol–1 A. 2.4 g B. 3.2 g C. 12.8 g D. 13.3 g 2. 20 cm3 of a gaseous hydrocarbon was burnt in 150 cm3 of oxygen. After cooling to room temperature, the residual gaseous products occupied a volume of 110 cm3. The gas was then bubbled through aqueous calcium hydroxide, and it was reduced to 30 cm3. What is the molecular formula of the hydrocarbon? A. C3H6 B. C3H8 C. C4H8 D. C4H16 3. Which element undergoes reduction in the following reaction? (NH4)2Cr2O7 (s) → N2 (g) + 4H2O (l) + Cr2O3 (s) A. Cr B. H C. N D. O

4 4. What is the coefficient for H+ when the following equation is balanced using the smallest possible whole numbers? ____ClO‒ + ____I‒ + ____H+ → ____Cl– + ____I2 + ____H2O A. 1 B. 2 C. 4 D. 5 5. Which graph correctly describes the behaviour of a fixed mass of an ideal gas? (T is measured in K.) I II III A. I and II only B. I and III only C. II and III only D. I, II and III

5 6. Flask X contains 1 dm3 of helium at 2.00 x 103 Pa and flask Y contains 2 dm3 of neon at 1.00 x 103 Pa. The flasks are later connected at a constant temperature, what is the final pressure? A. 1.33  103 Pa B. 1.50  103 Pa C. 1.67  103 Pa D. 2.00  103 Pa 7. Which equation represents a reaction that occurs under standard conditions? A. 2 LiBr (aq) + I2 (aq) → 2 LiI (aq) + Br2 (aq) B. 2 KF (aq) + Cl2 (aq) → 2 KCl (aq) + F2 (aq) C. 2 LiCl (aq) + I2 (aq) → 2 LiI (aq) + Cl2 (aq) D. 2KBr (aq) + Cl2 (aq) → 2 KCl (aq) + Br2 (aq) 8. Which combination of statements about the oxides of period 3 elements is correct? State at room temperature Electrical conductivity in molten state