C6.2 - Changes at the electrodes (needs finishing) Flashcards
1
Q
At electrodes negatively charged ions _____ electrons and positive _____ them to become neutral
A
Loose, gain
2
Q
What is gaining electrons called? (Happens at cathode)
A
Reduction
3
Q
What is loosing electrons called? (Happens at the anode)
A
Oxidation
4
Q
How can you represent what is happening at each electrode?
A
With half equations
5
Q
What is the half equation for the electrolysis of lead bromide PbBr2 at the cathode?
A
Pb^2+ + 2e^- -> Pb
6
Q
What is the half equation for the electrolysis of lead bromide PbBr2 at the anode?
A
2Br^- -> Br2 + 2e^-
7
Q
If two elements can be produced at an electrode, which one will usually be formed?
A
The less reactive one
8
Q
What is the order of discharge at the anode?
A
Halide ion > hydroxide > all other negatively charged ions
