ACSI 2022 P1 Final (QP)

Anglo-Chinese School (Independent) Year 6 Preliminary 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. Write your Candidate number and the subject on the separate 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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3 1. What mass, measured in g, of hydrogen is formed when 3 mol of aluminium react with excess hydrochloric acid according to the following equation? 2Al (s) + 6HCl (aq) → 2AlCl3 (aq) + 3H2 (g) A. 3.0 B. 4.5 C. 6.0 D. 9.0 2. The volume of an ideal gas at 27.0 °C is increased from 3.00 dm 3 to 6.00 dm 3. At what temperature, in °C, will the gas have the original pressure? A. 13.5 B. 54.0 C. 327 D. 600 3. Which describes the visible emission spectrum of hydrogen? A. A series of lines at regular intervals. B. A series of lines converging at lower energy. C. A series of lines converging at higher frequency. D. A series of lines converging at longer wavelength. 4. Which species have the same number of electrons? I S2− II Cl− III Ne A. I and II only B. I and III only C. II and III only D. I, II and III

4 5. Between which ionization energies of aluminium will there be the greatest difference? A. Between 1st and 2nd ionization energies B. Between 2nd and 3rd ionization energies C. Between 3rd and 4th ionization energies D. Between 4th and 5th ionization energies 6. Which one of the following consists of an acidic oxide, an amphoteric oxide and a basic oxide of period 3 elements? A. Al2O3, MgO and SiO2 B. Al2O3, Na2O and NO2 C. CaO, SO2 and ZnO D. Cl2O, SiO2 and P4O10 7. Which of the following properties of the halogens generally shows a decreasing trend from fluorine to iodine? I boiling point II electronegativity III oxidizing strength A. I and II only B. I and III only C. II and III only D. I, II and III 8. Which of these species cannot act as a ligand? A. CH4 B. CN− C. CO D. (CH3)3P

5 9. Which of the following molecules is polar? A. Carbon dioxide, CO2 B. Cis-1,2-dichloroethene, C2H2Cl2 C. Tetrachloromethane, CCl4 D. Trans-1,2-difluoroethene, C2H2F2 10. Which of the following compounds has the greatest covalent character in the ionic compound? A. LiF B. LiI C. CsI D. CsF 11. Antibiotic-resistant bacterial infections can be treated using a mixture of penicillins and clavulanic acid. The structure of clavulanic acid is shown below. What is the hybridization of the circled carbon, oxygen and nitrogen atoms? Carbon Oxygen Nitrogen A. sp2 sp sp2 B. sp2 sp2 sp3 C. sp3 sp3 sp D. sp3 sp2 sp

6 12. Which one of the following will not form intermolecular hydrogen bonds with its own molecules? A. CH3NH2 B. CH3CH2OH C. CH3COOCH3 D. (COOH)2 13. Which of the following compound species has net dipole moment? A. BF3 B. (CH3)2CO C. XeF4 D. PCl5 14. When 25.0 cm3 of 0.100 mol dm−3 NaOH (aq) is mixed with 50.0 cm3 of 0.050 mol dm−3 H2SO4 (aq) at the same temperature, a temperature rise, ∆T, is recorded. What is the expression, in kJ mol−1, for the enthalpy of neutrali zation? (Assume the density of the mixture = 1.00 g cm −3 and its specific heat capacity = 4.18 J g−1 K−1) A. – 25.0 × 4.18 × ∆T 25.0 × 0.100 B. – 75.0 × 4.18 × ∆T 50.0 × 0.050 × 1000 C. – 50.0 × 4.18 × ∆T × 1000 50.0 × 0.050 D. – 75.0 × 4.18 × ∆T 25.0 × 0.100 15. Which equation represents the average bond enthalpy of the Si−Cl bond in SiCl4? A. SiCl4 (g) → SiCl3 (g) + Cl (g) B. 1 4SiCl4 (g) → 1 4Si (g) + Cl (g) C. SiCl4 (g) → SiCl3 (g) + 1 2Cl2 (g) D. SiCl4 (g) → Si (g) + 4Cl (g)

7 16. The combustion of ascorbic acid is exothermic and occurs according to the following equation: C6H8O6 (s) + 5O2 (g) → 6CO2 (g) + 4H2O (g) Which is correct for this reaction? H S spontaneity A negative positive spontaneous B negative positive non–spontaneous C positive negative spontaneous D positive positive non–spontaneous 17. Which ion’s hydration energy is the most exothermic? A. Al3+ B. Br – C. Na+ D. Se2–

8 18. Propanone, CH3COCH3, reacts with iodine in an acid-catalyzed reaction as shown in the equation below. CH3COCH3 + I2 CH2ICOCH3 + HI The rate equation for this reaction is rate = k [CH3COCH3] [H+] [I2]0 Which of the following graphs is correct of the above reaction when propanone , CH3COCH3, is in excess? A. B. C. D. 19. Bromine reacts with methanoic acid, HCOOH, in an open beaker to produce hydrobromic acid , HBr, and carbon dioxide gas. Br2 (aq) + HCOOH (aq) → 2HBr (aq) + CO2 (g) Which of the following methods is not suitable for studying the kinetics of this reaction? A. Measuring the conductivity of the solution over time. B. Measuring the change in pressure of the reaction over time. C. Measuring the change in colour intensity of the mixture over time. D. Measuring the change of pH of the solution over time. Rate [H+] [I2] Rate [CH3COCH3] time [H+] time H+

9 20. The diagram shows the Maxwell-Boltzmann energy distribution curve of molecular energies at a given temperature. Which of the factors that affect the rate of a reaction can be explained using such a Boltzmann distribution curve? I Increasing the concentration of reactants II Increasing the temperature III Addition of a catalyst A. I and II only B. I and III only C. II and III only D. I, II and III Number of molecules Kinetic energy

10 21. The graph below shows how the concentration of reactants and products change over time for the reversible reaction of ethyl ethanoate with water. CH3COOC2H5 + H2O ⇌ CH3COOH + C2H5OH Which of the following can be determined from the graph? A. The equilibrium concentrations of the reactants and products were 0.2 mol dm−3. B. The forward reaction stopped after four hours. C. The system reached equilibrium after two hours. D. The reaction did not go to completion. 22. Dimerization of brown nitrogen dioxide gas (NO2) to the colourless dinitrogen tetroxide (N2O4) exists in equilibrium. 2NO2 (g) ⇌ N2O4 (g) H = −54.8 kJ mol−1 Which of the following change would cause an increase in the equilibrium concentration of N2O4 (g)? A. Introducing a catalyst. B. Decreasing the temperature in the container. C. Increasing the volume of the container. D. Adding argon gas (Ar) at constant volume. products reactants concentration / mol dm−3 time / hours