# Oxidation‐Reduction Reactions (Worksheet)

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Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

In each of the following redox reactions, indicate the elements that undergo changes in oxidation number and the magnitude of change. Then identify the element oxidized and reduced, as well as the oxidizing agent and reducing agent.

a. $$I_2O_5 + 5 CO \rightarrow I_2 + 5 CO_2$$

b. $$3Hg^{2+} + N2H4 \rightarrow 2 Hg + N_2 + 4 H^+$$

c. $$3H_2S + 2H+ + 2NO3‐ \rightarrow 3S + 2NO + 4H_2O$$

d. $$Ba^{2+} + 2OH‐ + H2O2 + 2ClO2‐ \rightarrow Ba(ClO_2)_2 + 2H_2O + O_2$$

e. $$PBr_3 + 3H2O \rightarrow H_3PO_3 + 3HBr$$

f. $$NaI + 3 HOCl \rightarrow NaIO_3 + 3 HCl$$

g. $$3SO_2 + 2HNO_3 + 2H_2O \rightarrow 3H_2SO_4 + 2NO$$

h. $$2H_2SO_4 + 2 NaBr \rightarrow Br_2 + SO_2 + Na_2SO_4 + 2H_2O$$