Question

what reaction would the chemical equation ch₄ + 2o₂ → 2h₂o + co₂ represent?
○ formation of methane
○ combustion of methane
○ replacement of methane
○ decomposition of methane

Explanation:

Combustion reactions involve a substance reacting with oxygen to produce carbon dioxide and water (in case of hydrocarbons). Here, methane (\(CH_4\)) reacts with oxygen (\(O_2\)) to form \(CO_2\) and \(H_2O\), which is characteristic of a combustion reaction. Formation would involve making methane (not the case here as methane is a reactant). Replacement reactions involve substitution of atoms. Decomposition would break down methane (but here it reacts with another substance).

Answer:

combustion of methane