Chapter 4, Problem 12E

Use the following equations to answer the next four questions:

1. ${\text{H}}_2\text{O}\left(s\right)\to {\text{H}}_2\text{O}\left(l\right)$

${\text{Na}}^{+}\left(aq\right)+{\text{Cl}}^{-}\left(\text{aq}\right)+{\text{Ag}}^{+}\left(aq\right)+{\text{NO}}_3^{-}\left(aq\right)\to \text{AgCl}\left(s\right)+{\text{Na}}^{+}\left(aq\right)+{\text{NO}}_3^{-}\left(aq\right)$

${\text{CH}}_3\text{OH}\left(g\right)+{\text{O}}_2\left(g\right)\to {\text{CO}}_2\left(g\right)+{\text{H}}_2\text{O}\left(g\right)$

$2{\text{H}}_2\text{O}\left(l\right)\to {\text{2H}}_2\left(g\right)+{\text{O}}_2\left(g\right)$

${\text{H}}^{+}\left(aq\right)+{\text{OH}}^{-}\left(aq\right)\to {\text{H}}_2\text{O}\left(l\right)$

(a) Which equation describes a physical change?

(b) Which equation identifies the reactants and products of a combustion reaction?

(c) Which equation is not balanced?

(d) Which is a net ionic equation?