Identify the type of reaction which will occur based on the information provided about the reactants:

${\mathrm{CH}}_{4\left(\mathrm{g}\right)}+{\mathrm{O}}_{2\left(\mathrm{g}\right)}\to$

The two products that are typically produced when a reactant reacts with ambient oxygen are carbon dioxide and water. Any substance will be heated using oxygen present in the atmosphere.

The term "combustion" is typically used to refer to heating, as we well know. The only major reactant in the combustion reaction is oxygen, which is taken from the atmosphere and results in the production of two main products: water vapour and carbon dioxide. The full response is displayed below.
${\mathrm{CH}}_{4\left(\mathrm{g}\right)}+2{\mathrm{O}}_{2\left(\mathrm{g}\right)}\to {\mathrm{CO}}_{2\left(\mathrm{g}\right)}+2{\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{g}\right)}$
One mole of gaseous methane combines with two moles of atmospheric oxygen to produce one mole of carbon dioxide and two moles of water vapour in the reaction described above. The combustion reaction is typically represented by the heating process, which also transfers energy from the environment.