Summary AQA A level chemistry redox full revision notes

Redox Reacticns
7.|OxIDAtiON AN) REDVCTION, 7. 2 oxpATION STATCs

Redox reaction - oxIdation and reduction at the same tme

Oxidation Reduction!
- Gan ot o - Loss of
xygen
-Loss of ejetrons Oxygen
Gon of electrons
Loss ot hydrogen
lnceae in oxidaton state
Gain of hydrogen
Derease n oxidaton state

Oxid1s1ng ogent- electron occepter
Reduc1ng agent-electron donor
0xidation state- number of electrons to lose or qoain to become
neutral assigned to each element n asubstance
electrically
Oxdation state rulesi
Oxidation state of atoms in pure elements are 0
- ln an
uncharged campound, sum of oxydation stotes is O
for ions of one element, oxidation stote is the same as the charqe
for ions ot more than one element, oxidutiom state of all elements sums
ko cherye on the on.
In compounds and ions, somê elements oxidaton states rarely change
Fluorine 1s aluwos
Group lmetals always
Lztoup 2 metals always 2
0is -2 fexept Oz' 0,, 0f andO,fa)
LOmnnon example H,O2 whee Ohas oaidat1on state -)
4is t lexcept when combiaed with metals)

ldent1fying redon react1ons
OxIdation state incresses trom 0- t2 so oxidatiGn
+2 (-1)
Mg is) 2HCl (aq)
oxIdaton stote deueoses trorm +l to 0 so reduction