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REDOX REACTIONS - Coggle Diagram
REDOX REACTIONS
OILRIG
O
xidation
I
s
L
oss of electrons
R
eductions
I
s
G
ain of electrons
Reduction
removal of oxygen
reducting agent
a substance which reduces something else
gives electrons away (so loses electrons itself)
Non-metals gain electrons to form negative ions
they are reduced
This can be represented by using half-equations
O2 + 4
e-
=> 2O
2-
Oxidation
Addition of oxygen
Oxidising agent
a substance which oxidises something else
removes electrons from something else (so gains electrons itself)
Metals lose electrons and form positive ions
they are oxidised
This can be represented using half-equations
Mg => Mg
2+
+2
e-
Redox reaction
is when both oxidation and reduction happens
Reaction with sodium
2Na(s) + Cl2(g) => 2NaCl(s)
2Na => 2Na
+
+ 2
e-
Oxidation (loses electrons)
Cl2 + 2
e-
=> 2cl
-
Reduction (gains electrons)
Rusting
Metal oxidises
reacts with/ gains oxygen (loses electrons)
Copper oxidising to form copper (ii) oxide
Only iron rusts.
Needs oxygen AND water
Type of redox reaction
iron is oxidised
Fe2O3 nH2O