Electrolysis Y10
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Difference between atom and ion
Atom-neutral - same no of protons and electrons Ion- charged atom- lost or gained electrons
What is an ion
Charged atom
What is a half equation
An equation to represent loss/gain of electrons
What is electrolysis start with and end with
Starts with ion then loses/gains electrons to form neutral atom
In half equations can you get - electrons
No you then swap electrons to other side so it adds
In equation what is electron represented as
e-
Practice half equations
Ok
Why are half equations recognisable
Always have electrons in them
Things to remember when doing half equations
Never minus electrons Diatomic elements
What is oxidation in terms of electrons
Loss of electrons
What is reduction in terms of electrons
Gain of electrons
Way to remember oxidation and reduction
O xidation I s L oss R eduction I s G ain of electrons
If electrons on right side of equation is it reduction or oxidation
Oxidation
If electrons on left side of equation is it reduction or oxidation
Reduction
What side will electrons be on if reduction in half equations
Left
What side will electrons be on if oxidation in half equations
Right
Why do covalent substances not conduct electricity
They have no charged particles that are free to move
Would NaCl (s) conduct electricity and why
No, ions in fixed position and not free to move
Would NaCl (l) conduct electricity and why
Yes ions free to move
Would NaCl (aq) conduct electricity and why
Yes ions free to move
Definition of electrolysis
Involves passing an electric current through an ionic compound that is either molten or dissolved and causing it to break down
Why does the ionic compound have to be molten or dissolved
Ionic compounds don’t conduct electricity when solid but do when molten or dissolves because ions become free to move
What is an electrolyte
The compound that undergoes electrolysis
What does an electrolyte have to be able to do
Conduct electricity