This experiment allows for a
study of the electrolysis of water without the use of the
traditional Hoffman apparatus. An experimental study of the
electrolysis of water can be used to demonstrate
oxidation-reduction reactions or to illustrate the use of an
external source of energy to drive a non-spontaneous chemical
reaction.
The relative volumes of the
gases produced and the reactions of the gases to the glowing
and burning splints can be compared with the theory of the
production of oxygen at the anode and hydrogen at the
cathode. The colors produced at each electrode can be used to
identify the production of hydrogen ion at the anode and
hydroxide ion at the cathode.
Educational Value
Statement
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Describes electrolysis, in
particular water electrolysis.
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Describes an experiment of
the electrolysis of water without the use of the
traditional Hoffman apparatus.
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Can be used as a
demonstration experiment.
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Describes further
experimenting options for be investigated.
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Explains the half reactions
that occur at the anodes and cathodes for each type of
electrolyser.
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Can be downloaded as a PDF
File.
Key Learning Objectives
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students explain chemical
processes in terms of atoms and energy
transfers
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students identify the ratio
of hydrogen and oxygen gas production.
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Students explain how
chemical reactions are used to predict the relative
quantities of chemicals produced.
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Students explain how
different factors influence the rate of
reactions.
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Students explain the
concept of energy conservation and represent energy
transfer and transformation within systems.
Strands
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Science Understanding:
Chemical sciences
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Science Inquiry
Skills