Redox Half Reactions and Reactions WS
1. State the Oxidation Number of each of the elements that is underlined.
a) NH3
b) H2SO4
c) ZnSO3
d) Al(OH)3
e) Na
f) Cl2
g) AgNO3
h) ClO4-
j) K2Cr2O4
k) Ca(ClO3)2
l) K2Cr2O7
n) HClO
o) MnO2
p) KClO3
q) PbO2
r) PbSO4
s) K2SO4
t) NH4+
u) Na2O2
v) FeO
w) Fe2O3
x) SiO44-
y) NaIO3
z) ClO3-
aa) NO3-
i) SO2
m) HPO3
2-
cc) CaH2
dd) Pt(H20)5(0H)
2+
bb) Cr(OH)4
ee) Fe(H2O)6
3+
ff) CH3COOH
2. What is the oxidation number of carbon in each of the following substances?
a) CO
d) CO3
2-
3. Define each
b) C
c) CO2
e) C2H6
f) CH3OH
Oxidation
Oxidizing agent
Reduction
Reducing agent
4. For each of the following reactions, identify: the oxidizing agent, the reducing agent, the substance oxidized and the substance
reduced.
a) Cu2+ (aq)
Zn (s)
-------->
Cu (s) +
Substance reduced
Oxidizing agent
Reducing agent
+
2 Na (s) -------->
2 Na+ (aq)
+
Substance reduced
Oxidizing agent
Reducing agent
Determine the oxidation number for the element underlined.
PbSO4
ClO3-
HPO32-
Na2O2
CaH2
Al2(SO4)3
NaIO3
C4H12
Al3+
+
Zn
→
Substance oxidized
7.
Cr2O72-
2 Cl- (aq)
Substance oxidized
What is Oxidized & what is the oxidizing agent
6.
Zn2+ (aq)
Substance oxidized
b) Cl2 (g)
5.
+
+
Substance reduced
Al
+
Zn2+
Oxidizing agent
ClO2- →
Cr3+
+
ClO4-
Oxidizing agent
8.
Cr3+
+
ClO4-
→
Cr2O72- +
ClO2-
Substance reduced
9.
3As2O3
+
Oxidizing agent
4NO3- + 7H2O + 4 H+ → 6H3AsO4
Substance reduced
+ 4NO
Reducing agent
Write half reactions for each of the following atoms or ions. Label each as oxidation or reduction.
10.
Al
--------->
Al3+
11.
S
--------->
S2-
12.
O2-
--------->
O2
13.
Ba2+
--------->
Ba
14.
N3-
--------->
N2
15.
Br2
--------->
Br-
16.
P
--------->
P3-
17.
Ca
--------->
Ca2+
18
Ga3+
--------->
Ga
19.
S
--------->
S2-
20.
H2
--------->
H+
21.
H+
--------->
H2
22.
F-
---------->
F2
23.
P3-
---------->
P
Balance each spontaneous redox equation. Identify the entities reduced and oxidized. State the reducing agent and the oxidizing agent.
24.
Al
+
Zn2+
→
Al3+ +
Zn
25.
F2
+
O2-
→
F-
+
O2
26.
Ca
→
Ca2+ +
O2-
27.
Al3+
→
Al
3Li+
+
+
O2
Li
+