R. Janssen, MSEC Chemistry 12 Provincial Workbook .Chemistry 12 Provincial Exam Workbook Unit 05:

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  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 1 / 75

    Chemistry 12 Provincial Exam Workbook Unit 05: Electrochemistry

    Multiple Choice Questions 1. Which of the following is correct as the cell operates?

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 2 / 75

    2. Which of the following describes the direction of electron flow and the change in mass of the Ag electrode as the cell operates?

    3. An iron pipeline can be protected from rusting by connecting it to a... A. silver electrode buried beside the pipeline B. copper electrode buried beside the pipeline C. positive terminal of a direct current power supply D. negative terminal of a direct current power supply 4. The electrolysis of molten NaCl is an industrial process. What does the electrolysis

    produce?

    A. Na and 2Cl

    B. 2H and 2O

    C. Na and -Cl

    D. NaOH and 2Cl

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 3 / 75

    5. The reduced substance in a chemical reaction can best be described as a substance that

    A. is the reducing agent and loses electrons. B. is the reducing agent and gains electrons. C. is the oxidizing agent and loses electrons. D. is the oxidizing agent and gains electrons. 6. Consider the following redox reaction for a lead-acid storage cell

    2

    2 4 4 2Pb PbO 4H 2SO 2PbSO 2H O

    The balanced, reduction half-reaction is

    A. 24 4Pb SO PbSO 2e

    B. 24 4 2Pb 2H SO PbSO H O 2e

    C. 22 4 4 2PbO 4H SO 2e PbSO 2H O

    D. 22 4 2 4PbO SO 4H O 2e PbSO 4OH

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 4 / 75

    7. Which of the following statements apply to this electrochemical cell?

    A. I and II only B. I and III only C. II and III only D. I, II and III

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 5 / 75

    8. At equilibrium, the voltage of the cell above is

    A. - 1.10 V B. + 0.00 V C. + 0.42 V D. + 1.10 V 9. Consider the following reaction

    2 2Cd (aq) Zn(s) Cd(s) Zn (aq)

    The potential for the reaction is +0.36V. What is the reduction potential for the cadmium ion?

    A. - 1.12 V B. - 0.40 V C. + 0.40 V D. + 1.12 V 10. Which of the following involves a non-spontaneous redox reaction? A. fuel cell B. electroplating C. redox titration D. carbon dry cell

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 6 / 75

    11. Ethanol, 2 5C H OH , is oxidized by an acidified dichromate solution according to the

    following equation:

    2 3

    2 7 2 5 2 32Cr O 16H 3C H OH 4Cr 11H O 3CH COOH

    The E for the reaction above is 2.98V. The E for the oxidation of ethanol is

    A. 0.52V B. 1.23V C. 1.75V D. 2.98V 12. Which of the following must be present to produce rust by the corrosion of iron?

    A. I only B. II only C. I and II only D. I, II and III

    13. Why can an object not be plated with magnesium using 1.0 M 2MgI ?

    A. Water is a stronger reducing agent than I

    B. Water is a stronger oxidizing agent than I

    C. Water is a stronger reducing agent than 2Mg

    D. Water is a stronger oxidizing agent than 2Mg

    14. In the electrolysis of 1.0 M 2 4Na SO , what is formed at the cathode?

    A. 2O

    B. 2H

    C. 2 3H SO

    D. 22 8S O

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 7 / 75

    15. Which of the following is capable of acting both as an oxidizing agent and a reducing agent?

    A. H

    B. Na

    C. 2Sn

    D. 4MnO

    16. Consider the following redox reaction:

    2 12 6 2 2 2C H O 6O 6CO 6H O

    The substance undergoing reduction is

    A. 2O

    B. 2CO

    C. 2H O

    D. 6 12 6C H O

    17. The oxidation number of P in 4 2 7H P O is

    A. -10 B. -5 C. +5 D. +10 18. Consider the following redox reaction

    2 2 4

    4 22MnO 16H 5Sn 2Mn 8H O 5Sn

    In a redox titration, 0.060 mol of 4KMnO reacts completely with a solution of 3 2Sn NO . How

    many moles of 3 2Sn NO were present in the solution? A. 0.024 mol B. 0.060 mol C. 0.15 mol D. 0.30 mol

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 8 / 75

    19. What substances are formed at the anode and cathode during electrolysis of molten sodium chloride, NaCl(l)?

    20. What is the minimum voltage required to form nickel from an aqueous solution of 2NiI

    using inert electrodes? A. 0.26 V B. 0.28 V C. 0.54 V D. 0.80 V 21. Which of the following represents a redox reaction?

    A. 3 2CaCO CaO CO

    B. 4 2SiCl 2Mg Si 2MgCl

    C. 2 4 2 2 42NaOH H SO 2H O Na SO

    D. 32

    2 3 2 3 2AgBr 2S O Ag S O Br

    22. Consider the following reaction

    4 2 2 2TiCl O TiO 2Cl

    Each oxygen atom is

    A. reduced and loses 2e

    B. reduced and gains 2e

    C. oxidized and loses 2e

    D. oxidized and gains 2e

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 9 / 75

    23. When 2NO acts as a reducing agent, a possible product is

    A. NO

    B. 2N O

    C. 2 4N O

    D. 52ON

    24. Which of the following 1.0 M solutions will react spontaneously with lead?

    A.

    B. 2CuCl

    C. 2ZnCl

    D. 2MgCl

    25. Consider the following redox reaction

    2 2

    2 2 3 4 6I 2S O S O 2I

    In a titration, 40.00mL of 2 2 3Na S O is needed to react completely with 3

    24.0x10 mol I . What is

    the concentration of 2 2 3Na S O ?

    A. 0.10 M B. 0.16 M C. 0.20 M D. 0.32 M 26. In an operating electrochemical cell the function of a salt bridge is to A. allow hydrolysis to occur B. allow a non-spontaneous reaction to occur C. permit the migration of ions within the cell D. transfer electrons from the cathode to the anode

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 10 / 75

    27. As the cell operates, electrons flow toward

    A. the Pb electrode, where Pb is oxidized

    B. the Cd electrode, where Cd is oxidized

    C. the Pb electrode, where 2Pb is reduced

    D. the Cd electrode, where 2Cd is reduced

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 11 / 75

    28. The E value for the reduction of 2Cd is

    A. - 0.40 V B. - 0.27 V C. + 0.14 V D. + 0.40 V 29. The following reaction occurs in an electrochemical cell:

    2 33Cu 2Cr 2Cr 3Cu

    The E for the cell is

    A. 0.40 V B. 0.75 V C. 1.08 V D. 2.50 V 30. During the corrosion of magnesium, the anode reaction is

    A. 2Mg Mg 2e

    B. 2Mg 2e Mg

    C. 2 24OH O 2H O 4e

    D. 2 2O 2H O 4e 4OH

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 12 / 75

    31. A molten binary salt, 2ZnCl , undergoes electrolysis. The cathode reaction is

    A. 2Zn Zn 2e

    B. 22Cl Cl 2e

    C. 2Cl 2e 2Cl

    D. 2Zn 2e Zn

    32. Manganese has an oxidation number of +4 in A. MnO

    B. 2MnO

    C. 2 3Mn O

    D. 2 7Mn O

    33. In which reaction is nitrogen reduced?

    A. 2 22NO O 2NO

    B. 3 2 24NH 5O 4NO 6H O

    C. 2 2 2 3Cu 2NO 2H O Cu 4H 2NO

    D. 23 4 24Zn 10H NO 4Zn NH 3H O

    34. An oxidizing agent will cause which of the following changes?

    A. 2PtO PtO

    B. 3 2PtO PtO

    C. 2

    Pt OH Pt

    D. 2

    32Pt OH PtO

    35. Consider the overall reaction of the rechargeable nickel-cadmium battery

    2 2 2NiO (s) Cd(s) 2H O(l) Ni OH (s) Cd OH (s)

    Which of the following occurs at the anode as the reaction proceeds?

    A. Cd loses 2e and forms 2

    Cd OH (s)

    B. Cd gains 2e and forms 2

    Cd OH (s)

    C. 2NiO loses 2e and forms

    2Ni OH (s)

    D. 2NiO gains 2e and forms

    2Ni OH (s)

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 13 / 75

    36. Which of the following will oxidize 2Fe ?

    A. 2I (s)

    B. Ni(s)

    C. Zn(s)

    D. 2Br (l)

    37. Consider the following half-reaction in a basic solution:

    2 3Ag O AgO (basic)

    The balanced half-reaction is

    A. 2 3 2Ag O 4H 4e AgO 2H O

    B. 2 3 2Ag O 2H 2e 2AgO H O

    C. -2 3 2Ag O H O 2e 2AgO 2OH

    D. -2 3 2Ag O 2H O 4e AgO 4OH

    38. The concentration of 2Fe (aq) can be determined by a redox titration using

    A. KBr

    B. 2SnCl

    C. 4KMnO (basic)

    D. 3KBrO (acidic)

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 14 / 75

    39. Consider the following electrochemical cell

    Which of the following occurs as the cell operates? A. Zinc electrode is reduced and increases in mass B. Zinc electrode is reduced and decreases in mass C. Zinc electrode is oxidized and increases in mass D. Zinc electrode is oxidized and decreases in mass 40. Which of the following reactants would produce an E of +0.63 V?

    A. 2Ag I

    B. 2Pb Zn

    C. 2Mg Ca

    D. 2Zn Mn 41. The process of applying an electric current through a cell to produce a chemical

    change is called A. corrosion B. ionization C. hydrolysis D. electrolysis

  • R. Janssen, MSEC Chemistry 12 Provincial Workbook (Unit 05), P. 15 / 75

    42. Consider the following electrolytic cell

    The cathode reaction is

    A. 22I I 2e

    B. 2 22H O 2e H 2OH

    C. 2 2H O 0.5O 2H 2e

    D. 2 22H O 2e H 2OH

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