ACSI 2019 Y6 Prelim Paper 1 QP

1 Anglo-Chinese School (Independent) YEAR 6 PRELIMINARY EXAMINATION 2019 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 1 Wednesday 18th September 2019 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 16 printed pages, including the cover page.

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4 1. Which coefficients would balance this equation? _HCl + _MnO2 → _MnCl2 + _Cl2 + _H2O HCl MnO2 MnCl2 Cl2 H2O A. 4 1 1 2 2 B. 4 1 1 1 2 C. 3 1 1 1 1 D. 2 1 1 1 1 2. 150 cm3 of water is added to a solution of 100 cm 3 of 0.50 mol dm −3 potassium nitrate. What is the concentration of potassium nitrate, in mol dm−3, in the new solution? A. 0.05 B. 0.10 C. 0.15 D. 0.20 3. Which statement correctly describes the atomic emission spectrum of hydrogen? A. It is a continuous spectrum converging at low frequency. B. It is a continuous spectrum converging at high frequency. C. It is a line spectrum converging at low frequency. D. It is a line spectrum converging at high frequency. 4. What is the condensed electron configuration of the telluride ion, Te2−? A. [Kr]5s25d105p6 B. [Kr]5s24d105p2 C. [Kr]5s24d105p6 D. [Kr]5s24d105p4

5 5. Which statement explains one of the decreases in first ionization energy (I.E.) across period 3? A. The nuclear charge of element Al is greater than element Mg. B. A new sub-level is being filled at element S. C. The p orbital being filled in element Al is at a lower energy than the s orbital in element Mg. D. There is electron-electron repulsion for the paired electrons in element S. 6. Which definition of electronegativity is correct? A. The attraction of an atom for a bonded pair of electrons in a covalent bond. B. The attraction between the nucleus and the outermost electron of an atom. C. The energy required for an atom in the gaseous state to gain one electron. D. The energy required for an atom to form a negative ion with a noble gas electron configuration. 7. Which is correct when the ionic or atomic radii are compared? A. Mg2+ > Al B. S2− > Cl− C. K < K+ D. B < C

6 8. An element is in Period 4 and Group 16 of the periodic table. How many electrons are present in the highest occupied main energy level of this element? A. 4 B. 6 C. 14 D. 16 9. Which compound contains both covalent and ionic bonds? A. sodium carbonate, Na2CO3 B. magnesium bromide, MgBr2 C. dichloromethane, CH2Cl2 D. ethanoic acid, CH3COOH 10. Which statements about diamond, graphite and a C60 fullerene molecule are correct? I. The best electrical conductor of the three is graphite. II. The atoms in graphite and C60 fullerene are sp2 hybridized. III. The atoms in diamond and C60 fullerene are arranged in hexagons. A. I and II only B. I and III only C. II and III only D. I, II and III 11. Which molecule is not planar? A. chlorobenzene B. hydrogen chloride C. nitrogen dioxide D. cyclohexene

7 12. Which is the correct order, of the substances below, arranged in order of increasing carbon−carbon bond length? C2H4 C2H6 C6H6 I II III A. I < II < III B. I < III < II C. II < III < I D. III < II < I 13. Compound X has the following structure: How many pi () and sigma () bonds are present in 1 molecule of X? Pi () Sigma () A. 8 12 B. 5 17 C. 4 12 D. 8 16

8 14. Consider the following equations. 3 2O2 (g) → 3O (g) ∆H = x kJ 3O2 (g) → 2O3 (g) ∆H = y kJ What is the standard enthalpy change, in kJ, of the reaction below? O3 (g) → 3O (g) A. y – x B. x – 2y C. x 2 + y D. x – y 2 15. Which reaction is endothermic? A. Cl (g) + e− → Cl− (g) B. K+ (g) → K+ (aq) C. 1 2Cl2 (g) → Cl (g) D. K+ (g) + Cl− (g) → KCl (s) 16. Which reaction has the greatest increase in entropy? A. Pb(NO3)2 (aq) + 2KI (aq) → PbI2 (s) + 2KNO3 (aq) B. CaCO3 (s) → CaO (s) + CO2 (g) C. 3H2 (g) + N2 (g) → 2NH3 (g) D. H2 (g) + I2 (g) → 2HI (g)

9 17. Iodine and propanone react according to the following equation. I2 (aq) + CH3COCH3 (aq) → CH3COCH2I (aq) + HI (aq) If the concentration of propanone is increased, keeping the total reaction volume constant, the rate of the reaction also increases. Which statement best explains this phenomenon? A. The proportion of effective collisions is higher at higher concentration. B. The particles are further apart at the higher concentration. C. The particles have more energy at the higher concentration. D. There are more collisions between reactant particles per second at the higher concentration. 18. What is the order with respect to each reactant? F2 (g) + 2ClO2 (g) → 2FClO2 (g) Experiment Initial [F2 (g)] / mol dm−3 Initial [ClO2 (g)] / mol dm−3 Initial rate / mol dm−3 s−1 1 0.100 0.010 1.2 x 10−3 2 0.100 0.040 4.8 x 10−3 3 0.200 0.010 2.4 x 10−3 Order with respect to F2 Order with respect to ClO2 A. 1 1 B. 1 2 C. 2 1 D. 2 4

10 19. Consider the following reaction between copper(II) carbonate and hydrochloric acid. CuCO3 (s) + 2HCl (aq) → CuCl2 (aq) + H2O (l) + CO2 (g) Which changes could be used to investigate the rate of the reaction? I. Total pressure in the reaction flask II. pH of the reaction mixture III. Colour intensity of the solution A. I and II only B. I and III only C. II and III only D. I, II and III 20. The conversion of compound X into Z was exothermic and proceeded by two steps where Y was the intermediate. The steps involved were: Step 1: X → Y Step 2: Y → Z It was found that step 1 is the rate-determining step. Which diagram represents the energy level diagram for the reaction? A. B. C. D.