1.
Copy and complete the following ion-electron equations. ​Decide if each shows
oxidation or reduction reaction and complete.
EXAMPLE:
Mg
Mg​2+
+
2e​-
(a) Cu​2+
+
2e​-
Cu
(b) Br​2
+
2e​-
2 Br​-
(c) Al
Al​3+
+
3e​-
(d) Fe​2+
Fe​3+
+
e​-
(e) Cu​2+
+
e​-
Cu​+
(f)
+
O​2​ + 4e​-
4OH​-
+
H​2​O
SO​4​2-
2 H​2​O
(g) SO​3​2-
2.
oxidation
+ 2H​+
+ 2 e​-
Copy the following redox reactions​. Name the reactant that is
oxidised and reduced.
EXAMPLE:
Zn(s)
Cu​2+​(aq) +
SO​4​2-​(aq)
+
Zn​2+​(aq) +
SO​4​2-​(aq)
+
Cu(s)
Zn​ is oxidised and ​Cu​2​+​ is reduced​.
(a)
Ca(s)
+
Ni​2+​(aq) +
2 Cl​-​(aq)
Ca​2+​(aq) +
2 Cl​-​(aq)
+
Ni(s)
(b)
Cl​2​(g)
+
2 K​+​(aq) +
2 Br​-​(aq)
2 K​+​(aq) +
2 Cl​-​(aq)
+
Br​2​(​l​)
(c)
Zn(s)
+
2 H​+​(aq) +
SO​4​2-​(aq)
Zn​2+​(aq) +
SO​4​2-​(aq)
+
H​2​(g)
(d)
4 Al(s)
+
3 O​2​(g)
2 (Al​3+​)​2​(O​2-​)​3​(s)
(e)
3 Mg(s)
+
(Fe​3+​)​2​(O​2-​)​3​(s)
3 Mg​2+​O​2-​(s)
+
2 Fe(​l​)
(f)
Identify any spectator ions in the reactions ​(a) – (e)​ and circle
them.