http://www.ck12.org Chapter 22. Oxidation-Reduction Reactions
Problems
- Determine the oxidation numbers of each of the atoms in the following.
a. KMnO 4
b. OF 2
c. H 2 C 2 O 4
d. Li 3 PO 4
e. NaClO
f. Br 2
g. ClF 3
h. CaH 2
i. K 2 O 2 - Determine the oxidation number of each of the atoms in the following ions.
a. NO 2 −
b. Cr 2 O 72 −
c. IO 3 −
d. BO 33 −
e. HCOO− - In light of the fact that oxygen (O 2 ) acts as an oxidizing agent in most reactions, which of the following
compounds would not undergo a reaction with oxygen? Explain.
a. NO 2
b. N 2 O 5
c. NO
d. N 2 O
e. N 2 - Use changes in oxidation number to determine which atoms are oxidized and which atoms are reduced in the
following reactions. State the change in oxidation number in each case.
a. 2KClO 3 (s)→2KCl(s) + 3O 2 (g)
b. 2Al(s) + 3Sn(NO 3 ) 2 (aq)→2Al(NO 3 ) 3 (aq) + 3Sn(s)
c. 2HNO 3 (aq) + 6HI(aq)→2NO(g) + 3I 2 (s) + 4H 2 O(l)
d. 2FeCl 3 (aq) + H 2 S(g)→2FeCl 2 (aq) + 2HCl(aq) + S(s) - State whether each reaction below is a redox reaction or a nonredox reaction.
a. H 2 (g) + CuO(s)→Cu(s) + H 2 O(l)
b. 2Al(s) + 3Sn(NO 3 ) 2 (aq)→2Al(NO 3 ) 3 (aq) + 3Sn(s)
c. 2HNO 3 (aq) + 6HI(aq)→2NO(g) + 3I 2 (s) + 4H 2 O(l)
d. 2FeCl 3 (aq) + H 2 S(g)→2FeCl 2 (aq) + 2HCl(aq) + S(s) - It was stated that decomposition reactions are generally redox reactions. The decomposition of calcium
carbonate shown below is not a redox reaction. Explain why it is not. How is this reaction different from
the decomposition reactions specified in the chapter?
Further Reading / Supplemental Links
- Determining Oxidation Numbers, http://www.kentchemistry.com/links/Redox/oxnumbers.htm
- Identifying Redox Reactions, http://www.kentchemistry.com/links/Redox/redoxrxns.htm
- Oxidation States (Oxidation Numbers), http://www.chemguide.co.uk/inorganic/redox/oxidnstates.html