C2 - Electrolysis

  • Oxidation
  • Reduction
  • Half equations
  • Aluminium
  • Electroplating
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What is electrolysis?
Splitting up with electricity. An electric current is passed through an ionic substance that's molten or in solution and breaks down into the elecments it's made of.
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What is oxidation and reduction?
Oxidation is the loss of electrons and reduction is the gain of electrons.
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How does electrolysis work?
When a salt is molten, it conducts electricity. Two electrodes are put in a heated molten salt. The negative electrons are attracted to the positive electrode and the positive electrons are attracted to the negative electrode.
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How does the reactivity series affect products of electrolysis?
Sometimes there are more than two free ions in the electrolyte. This can cause an element to stay in the solution e.g. hydrogen in NaCl solution because the element is less reactive than the metal ion.
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What are half-equations?
Half-equations show the reactons for the two electrodes e.g. NaCl solution negative electrode = 2H^+ + 2e^- -> Cl2 positive electrode = 2Cl^- - 2e^- -> Cl2
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How is electrolysis used to remove aluminium?
Aluminium oxide is dissolved in molten cryolite (a less common aluminium ore). This brings the melting point from 2000C to 900C which is cheaper and easier.Electrodes are made of carbon graphite. Al forms around the negative, O around the positive.
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What is electroplating?
Electroplating uses electrolysis to coat the surface of one metal with another metal
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What are the components of electroplating?
The positive electrode is pure metal you're going to cover the object with. The negative electrode is the object you're going to cover and the electrolyte needs to contain ions of the plating metal.
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When is electroplating used?
Decoration; trophies and jewelry are plated with gold and silver. Conduction; metals like copper conduct electricity well so plate metals for electric circuits and computers.
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Other cards in this set

Card 2

Front

What is oxidation and reduction?

Back

Oxidation is the loss of electrons and reduction is the gain of electrons.

Card 3

Front

How does electrolysis work?

Back

Preview of the front of card 3

Card 4

Front

How does the reactivity series affect products of electrolysis?

Back

Preview of the front of card 4

Card 5

Front

What are half-equations?

Back

Preview of the front of card 5
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