Chapter 5, Problem 5.14E

For each of the following equations, indicate whether the blue element has been oxidized, reduced, or neither oxidized nor reduced.

a. $\text{4Al}\left(\text{s}\right)+3{\text{O}}_{\text{2}}\left(\text{g}\right)\to {\text{2Al}}_2{\text{O}}_3\left(\text{s}\right)$

b. ${\text{SO}}_2\left(\text{g}\right)+{\text{H}}_{\text{2}}\text{O}\left(l\right)\to {\text{H}}_{\text{2}}{\text{SO}}_3\left(\text{aq}\right)$

c. ${\text{2KClO}}_{\text{3}}\left(\text{s}\right)\to 2\text{KCl}\left(\text{s}\right)+3{\text{O}}_{\text{2}}\left(\text{g}\right)$

d. $\text{2CO}\left(\text{g}\right)+{\text{O}}_2\left(\text{g}\right)\to {\text{2CO}}_2\left(\text{g}\right)$

e. $\text{2Na}\left(\text{s}\right)+{\text{2H}}_2\text{O}\left(l\right)\to 2\text{NaOH}\left(\text{aq}\right)+{\text{H}}_{\text{2}}\left(\text{g}\right)$