Types of Chemical Reactions Practice Test

A student heats solid calcium carbonate in a crucible and observes that a gas is released. The reaction is represented as: $\mathrm{CaCO_3(s) \rightarrow CaO(s) + CO_2(g)}$. Which reaction type best classifies this process?

Methane burns completely in oxygen to produce carbon dioxide and water: $\mathrm{CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(g)}$. Which reaction type best classifies this reaction?