Chapter 7, Problem 90E

Classify each chemical reaction as a synthesis, decomposition, single-displacement, or double-displacement reaction.

a. ${\text{Ca SO}}_{\text{4}}\left(g\right)\underset{\text{heat}}{\to }\text{CaO}\left(s\right)+\text{SO}\left(g\right)$

b. $2\text{ Na}\left(s\right)+{\text{O}}_{\text{2}}\left(g\right)\to {\text{Na}}_{\text{2}}{\text{O}}_{\text{2}}\left(s\right)$

c. $\text{Pb}\left(s\right)+2{\text{ AgNO}}_{\text{3}}\left(ag\right)\to \text{Pb}{\left({\text{NO}}_{\text{3}}\right)}_2\left(aq\right)+2\text{ Ag}\left(s\right)$

d. $\text{HI}\left(aq\right)+\text{NaOH}\left(aq\right)\to {\text{H}}_{\text{2}}\text{O}\left(l\right)+\text{NaI}\left(aq\right)$