Electrolysis

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The process of electrolysis
The process of electrolysis
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What is electrolysis?
Splitting up using electricity
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What happens when an ionic compound is melted or dissolved in water?
The ions are free to move- these are then able to conduct electricity and are called electrolytes
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What does passing an electric current though electrolytes cause?
Ions to move to the electrodes
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What are the two types of electrodes?
Anode, Cathode
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What is an anode?
Postive electrode
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What is a cathode?
Negative electrode
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Where do the positively charged ions go?
To the negative electrode
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Where do the negatively charged ions go?
To the positive electrode (anode)
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Electrolysis of molten ionic compounds
Electrolysis of molten ionic compounds
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What happens when when a simple ionic compound (lead bromide) is electrolyzed in the molten state using inert electrodes?
The metal (lead) is produced at the cathode and the non- metal (bromine) is produced at the anode
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Extracting metals using electrolysis
Extracting metals using electrolysis
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How can metals be extracted from molten compounds?
Using electrolysis
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When is electrolysis used?
used when the metal is too reactive to be extracted by reduction with carbon
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Why is the process (electrolysis) expensive?
Due to large amounts of energy needed to produce the electrical current
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Give an example of electrolysis?
Aluminium
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Electrolysis of aqueous solutions
Electrolysis of aqueous solutions
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What will be produced at the negative electrode?
Metal will be produced on the electrode if it is less reactive than hydrogen or Hydrogen will be produced if the metal is more reactive than hydrogen
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What is formed at the positive electrode?
Oxygen is produced at positive electrode unless the solution contains halide ions
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When do the ions discharge ?
When an aqueous solution is electrolyzed using inert electrodes
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Representations or reactions at electrodes as half equations
Representations or reactions at electrodes as half equations
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What doing using inert electrodes depends on?
Using inert electrodes depend on the relative reactivity of the elements involved
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What happens at the cathode (negative electrode)?
Positively charged ions gain electrons and so the reaction are REDUCTIONS
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What happens at the anode (positive electrode)?
Negatively charged ions lose electron so the reaction are OXIDATIONS
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How can reactions at electrodes be represented by?
Half equations
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Other cards in this set

Card 2

Front

What is electrolysis?

Back

Splitting up using electricity

Card 3

Front

What happens when an ionic compound is melted or dissolved in water?

Back

Preview of the front of card 3

Card 4

Front

What does passing an electric current though electrolytes cause?

Back

Preview of the front of card 4

Card 5

Front

What are the two types of electrodes?

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