4. Redox



L16: Displacement of metals from solution

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L16


L17: Relative activity of metals

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L18: Redox Reactions

  • Oxidation state: A measure of a chemical species’ degree of oxidation.
  • Uncombined elements have an oxidation state of zero.
  • Simple ions have an oxidation state equal to the charge on the ion.
  • During displacement reactions, the oxidation states of the two metal species involved change:
    • Metal elements increase their oxidation state, as they lose electrons.
    • Metal ions decrease their oxidation state, as they gain electrons.
  • The sum of the oxidation states for the elements in a molecule is zero.
  • In most compounds:
    • Hydrogen has an oxidation state of one.
    • Oxygen has an oxidation state of negative two.
  • Oxidation states can be used to describe electron transfer in oxidation-reduction reactions:
    • Oxidation involves an increase in oxidation state.
    • Reduction involves a decrease in oxidation state.

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L16



L19: Galvanic Cells

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Or this one - your choice. 

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L20: Calculating Cell Potential

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L21: Components of a Galvanic Cell and the Standard Hydrogen Electrode

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L21: Components of the Galvanic Cell



L22: Comparing Batteries

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Sources of Error in Galvanic Cells

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