ELECTROLYSIS ASSIGNMENT

Problems

  1. What is electrolysis?
  2. How does an electrolytic cell differ from a voltaic cell? Explain.
  3. Which requires a higher voltage for electrolysis to occur? O2 (g) or Sn (s).
  4. Where does reduction occur in a voltaic cell and an electrolytic cell?
  5. At the cathode, the half reaction(reduction) for zinc is Zn2+(aq) + 2e- –> Zn(s).
  6. What is the mass of zinc which will be deposited after an hour with a current of 1.5 A?

 

Answers

  1. Electrolysis is the use of an electric current through an electrolyte to create a non-spontaneous chemical reaction.
  2. Unlike the voltaic cell, the electrolytic cell uses electric energy for a non-spontaneous reaction instead of a spontaneous reaction. The cathodes and anodes are reversed from each other.
  3. Oxygen requires a higher voltage because it is a gas, whereas Sn is in a solid state and requires less voltage for electrolysis to occur.
  4. Reduction occurs in the cathode for the voltaic cell, while reduction occurs in the cathode for the electrolytic cell.
  5. 1 hour X (60 min/1 hour) X (60 sec/1 min) X (1.62 C/ 1sec) X (1 mol e-/ 96,485 C)= .0604 mol e-
  6. .0604 mol e- X (1 mol Zn/2 mol e-) X ( 65.38 g Zn/ 1 mol Zn)= 1.975 g Zn
Questions and Answers
  • 1.
    In electrolysis, only _____________ ions present can be discharged.
    Discuss
    • A.

      1 out of 4

    • B.

      2 out of 4

    • C.

      3 out of 4

    • D.

      4 out of 4

  • 2.
    What are the ions present in water?
    • A.

      H and OH

    • B.

      H+ and OH-

    • C.

      H2 and O

    • D.

      H2O

  • 3.
    If the anions in an aqueous solution are _________ ions,  they will be ________.
    • A.

      Not halide, discharged

    • B.

      Halide, discharged

    • C.

      Sulfate, discharged

    • D.

      Copper, discharged

  • 4.
    Which pair of electrolytes is not inert?
    • A.

      Mercury and Carbon

    • B.

      Mercury and Silver

    • C.

      Silver and Carbon

    • D.

      Copper and Silver

  • 5.
    Which metal is used in electroplating cans to store food?
    • A.

      Silver

    • B.

      Chromium

    • C.

      Tin

    • D.

      Nickel

  • 6.
    In the electrolysis of molten sodium chloride, what is the yellow green gas formed?
    • A.

      Oxygen

    • B.

      Chloride

    • C.

      Chlorine

    • D.

      Hydrogen

  • 7.
    ______ are _________ at the anode and _______ at the cathode.
    Discuss
    • A.

      Metals, oxidised, reduced

    • B.

      Atoms, reduced, oxidised

    • C.

      Ions, oxidised, reduced

    • D.

      Ions, reduced, oxidised

  • 8.
    A cathode is ____________ charged
    • A.

      Positively

    • B.

      Negatively

    • C.

      Neutrally

  • 9.
    An anode is __________ charged.
    • A.

      Positively

    • B.

      Negatively

    • C.

      Neutrally

  • 10.
    Which of these is not an application of electrolysis?
    • A.

      Rust removal

    • B.

      Electroplating

    • C.

      Making leather

    • D.

      Manufacture of bleach

Mugisa Geofrey and SOLOMON TATWEBWA

Mugisa Geofrey Zziwa is a learning facilitator with Ultimate MultiMedia Consult. With knowledge of the following topics:  Digital Pedagogy training or digital teaching skills, how to integrate ICT in teaching.  Journalism and the Internet/Computers (How internet helps journalism)  Basic web design & CMS and Multimedia Content publishing  Digital security and safety basics for journalists  Best practices for ensuring safety online  Data Mashups  Collaborative digital content development tools  Live streaming and Live reporting  Immersive Storytelling tools and practices  Among others I have conducted a number of trainings which include: • Multimedia Journalism and Digital Safety training for university Students held in Makerere University, Kampala International University and Cavendish University and sponsored by the American Embassy Uganda. • Digital Pedagogy training for Science Technology Engineering and Mathematics (STEM) Teachers held in Iganga Girls SSS in Iganga District for Eastern region Uganda, St. Maria Gorretti in MPigi District for Central region Uganda, and Teso College ALOET for the Karamoja region Uganda. Sponsored by Forum for African Women Educationalists Uganda (FAWEU) Training Teachers on integration of ICT in teaching and delivering lessons to students. • Digital Pedagogy at American Center for Teachers by Teachers In Need (TIN) Uganda. • Facilitator on Digital Pedagogy with ICT Teachers Association Uganda (ITAU) at American Center, Kyebambe Girls SSS in FortPortal for western region Uganda, Dr. Obote College Boro Boro Lira for Nothern Region Uganda.

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Mugisa Geofrey and SOLOMON TATWEBWA
6 years ago

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