7.2 Classifying Chemical Reactions

12. Use the following equations to answer the next four questions:

i. H2 O(s) ⟶ H2 O(l)

ii. Na+(aq) + Cl−(aq) + Ag+(aq) + NO3

−(aq) ⟶ AgCl(s) + Na+(aq) + NO3

−(aq)

iii. CH3 OH(g) + O2(g) ⟶ CO2(g) + H2 O(g)

iv. 2H2 O(l) ⟶ 2H2(g) + O2(g)

v. H+(aq) + OH−(aq) ⟶ H2 O(l)

(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?