QuestionClassify the following changes as endothermic or exothermic: burning a candle, cooking an egg, rain to snow, boiling water, and the reaction $$\mathrm{CH}_{4}+2 \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}+2 \mathrm{H}_{2} \mathrm{O} + \text{heat}$$.

Studdy Solution
The combustion reaction given involves the reaction of methane with oxygen to produce carbon dioxide, water, and heat. This process releases heat to the surroundings, so it is an exothermic process.
$$\mathrm{CH}_{4}+2 \mathrm{}_{2} \rightarrow \mathrm{CO}_{2}+2 \mathrm{H}_{2} \mathrm{} \text { + heat }: Exothermic$$