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Electrolysis
C2 5.4 Electroylsis GCSE AQA Chemistry
22
Chemistry
10th Grade
11/07/2013

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Term
Define: Dissolving
Definition
A solid, liquid or gas forming a solution in a solvent
Term
Define:Solute
Definition
The solid that dissolves in a solvent into a solution
Term
Define:Solvent
Definition
The liquid that the solute dissolves into
Term
Define:Solution
Definition
A mixture with a solute dissolved in a solution
Term
Define: Soluble
Definition
Something that will dissolve
Term
Define: Insoluble
Definition
Something that won't dissolve
Term
Is sodium Chloride soluble?
Definition
Yes, but ionic bonds aren't normally
Term
Define: Electrolysis
Definition
The decomposition of compounds using electricity
Term
What is an electrode?
Definition
An unreactive rod
Term
What is an Anode?
Definition
An anode is the positive electrode
Term
What is a cathode?
Definition
The negative electrode
Term
What is an electrolyte?
Definition
The solution which contains the dissolved compound which is decomposed.
Term
What is a cation?
Definition
The positive ions which migrate to the cathode
Term
What is an anion?
Definition
The negative ions which migrate to the positive electrode (anode)
Term
Which electrode do metals go to and why?
Definition
They go to the cathode as they are positive ions
Term
What is the flow of electricity?
Definition
The flow of electrons
Term
What is reduction?
Definition
Reduction is the gain of electrons
Term
What is oxidation?
Definition
The loss of electrons
Term
What type of equations do you use to show the movement of electrons?
Definition
Half equations
Term
What happens at the cathode in electrolysis?
Definition
Electrons arrive at the cathode (negative electrode) from the power suppluy, this gives it a negative charge and so attracts the cations (positive ions), the cations then take up the electrons to form atoms (not ions) This is a form of a reduction reaction
Term
What happens at the anode in electrolysis?
Definition
Electrons need to be given back to the circuit in order to make it complete. The positive charge attracts the anions (negative ions) which give their electrons to the circuit and become atoms. This is an oxidation reaction
Term
Why doesn't solid copper chloride conduct electricity?
Definition
The ions cannot move around when solid so needs to be aqueous
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