12 May 2012 ... Types of Reactions. Combination, decomposition, single displacement and
combustion reactions are all examples of oxidation-reduction.
Redox Worksheet Lab Section: MW or TTH
Name:
Oxidation-Reduction Exercise Assigning Oxidation Numbers Give the oxidation number of nitrogen in each of the following: NH2OH
N2
NH4+
N 2H 4
NO
Give the oxidation number of manganese in each of the following: MnO4–
Mn2O3
Mn
MnSO4
MnO22–
Types of Reactions Combination, decomposition, single displacement and combustion reactions are all examples of oxidation-reduction reactions. Note that there are reactions that do not fall into these categories that are redox reactions. Precipitation reactions that are categorized as double displacement (Also called exchange reactions in some textbooks.) are NOT oxidation-reduction reactions. All acid-base reactions, whether they are Arrhenius, Bronsted-Lowry or Lewis, are NOT oxidation-reduction reactions. Directions: For each of the following reactions classify the reaction as: (a) redox, (b) precipitation, or (c) acid-base. Reaction 1.
2Al(s) + 3Cl2(g) –> 2AlCl3(s)
2.
Ag+(aq) + Cl–(aq) –> AgCl(s)
3.
Mg(s) + 2HCl(aq) –> MgCl2(aq) + H2(g)
4.
Cu2+(aq) + H2S(aq) –> CuS(s) + 2H+(aq)
5.
Ba(s) + 2H2O(l) –> Ba2+(aq) + 2OH–(aq) + H2(g)
6.
2H+(aq) + CO32– (aq) –> CO2(g) + H2O(l)
7.
HCl(aq) + NH3(aq) –> NH4Cl(aq)
8.
2CH3CH3(g) + 7O2(g) –> 4CO2(g) + 6H2O(g)
9.
AgCl(s) + 2NH3(aq)–> Ag(NH3)2+(aq) + Cl–(aq)
Foothill College Chemistry 1C-Larson/Daley
Reaction Type
5
Last Modified 5/12/12
Redox Worksheet Lab Section: MW or TTH
Name:
Oxidizing and Reducing Agents and Equivalent Mass Complete the table below ONLY for the reactions classified as REDOX REACTIONS from above. If the reaction is not redox, leave blank. Reaction #
Reducing Agent
Electrons Lost per Formula Unit of Reducing Agent
Equivalent Mass of Reducing Agent
Oxidizing Agent
Electrons Gained per Formula Unit of Oxidizing Agent
Equivalent Mass of Oxidizing Agent
1 2 3 4 5 6 7 8 9
Foothill College Chemistry 1C-Larson/Daley
6
Last Modified 5/12/12
Redox Worksheet Lab Section: MW or TTH
Name:
Balancing Oxidation-Reduction Reactions 1.
For each of the following reactions balance the reaction using the half-reaction method. 2+ 3+ Fe (aq) + H2O2(aq) ! Fe (aq) + H2O(l)
2.
– I2(s) + S2O32– (aq) ! S4O62–(aq) + I (aq)
3.
PbO(s) + NH3(aq) ! N2(g) + Pb(s)
4.
MnO4–(aq) + C2O42–(aq) ! Mn2+(aq) + CO2(g)
Foothill College Chemistry 1C-Larson/Daley
(BASIC MEDIUM)
7
Last Modified 5/12/12
Redox Worksheet Lab Section: MW or TTH
Name:
5.
NaClO(aq) + NaCrO2(aq) ! NaCl(aq) + Na2CrO4(aq) (Try adding back the spectator ions at the end.)
6.
H2S(aq) + Cr2O72–(aq) ! S(s) + Cr3+(aq)
7.
PbO2(s) + NaCl(aq) ! NaClO(aq) + Na[Pb(OH)3](aq) (What is the medium? Try adding back the spectator ions at the end.)
8.
Br2(l) ! Br –(aq) + BrO3–(aq) Note: This reaction is a special type of redox reaction called a disproportination or self redox reaction where a single reactant (Br2 in this case) is both oxidized and reduced.
