Question

whats missing from this chemical reaction that shows the combustion of propane? ( \text{c}_3\text{h}_8 + \text{o}_2
ightarrow \text{h}_2\text{o} + \text{co}_2 )
answer options:
select one of four
the release of heat with the products
an intermediary transition to butane
methane as a secondary product
the absorption of heat by the reactants

Explanation:

Combustion reactions are exothermic, meaning they release heat. The given reaction for propane combustion ($\ce{C_{3}H_{8} + O_{2} -> H_{2}O + CO_{2}}$) is missing the indication of heat release. An intermediary transition to butane is incorrect as propane combusts, not transforms to butane. Methane is not a product of propane combustion. Combustion releases, not absorbs, heat, so "absorption of heat" is wrong.

Answer:

The release of heat with the products