1.
Copy and complete the following ion-electron equations. Decide if each shows
oxidation or reduction reaction and complete.
EXAMPLE:
Mg
Mg2+
+
2e-
(a) Cu2+
+
2e-
Cu
(b) Br2
+
2e-
2 Br-
(c) Al
Al3+
+
3e-
(d) Fe2+
Fe3+
+
e-
(e) Cu2+
+
e-
Cu+
(f)
+
O2 + 4e-
4OH-
+
H2O
SO42-
2 H2O
(g) SO32-
2.
oxidation
+ 2H+
+ 2 e-
Copy the following redox reactions. Name the reactant that is
oxidised and reduced.
EXAMPLE:
Zn(s)
Cu2+(aq) +
SO42-(aq)
+
Zn2+(aq) +
SO42-(aq)
+
Cu(s)
Zn is oxidised and Cu2+ is reduced.
(a)
Ca(s)
+
Ni2+(aq) +
2 Cl-(aq)
Ca2+(aq) +
2 Cl-(aq)
+
Ni(s)
(b)
Cl2(g)
+
2 K+(aq) +
2 Br-(aq)
2 K+(aq) +
2 Cl-(aq)
+
Br2(l)
(c)
Zn(s)
+
2 H+(aq) +
SO42-(aq)
Zn2+(aq) +
SO42-(aq)
+
H2(g)
(d)
4 Al(s)
+
3 O2(g)
2 (Al3+)2(O2-)3(s)
(e)
3 Mg(s)
+
(Fe3+)2(O2-)3(s)
3 Mg2+O2-(s)
+
2 Fe(l)
(f)
Identify any spectator ions in the reactions (a) – (e) and circle
them.
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