Examine the unbalanced equation.

ch4 + o2 → co2 + h2o

what is the best classification for the unbalanced equation's reaction, and why?

it is a combustion reaction, because carbon dioxide (co2) is emitted as a product.
it is a combustion reaction, because oxygen (o2) reacts with a substance.
it is a synthesis reaction, because o2 combines with ch4 to create a new substance.
it is a synthesis reaction, because o2 displaces carbon (c) and hydrogen (h).

The correct answer is: It is a combustion reaction, because oxygen reacts with a substance.

Explanation:

Combustion reaction defined as chemical reaction which hydrocarbon reacts with oxygen molecule to give water, carbon dioxide and heat as a product.

Here in the give reaction methane is undergoing combustion reaction in presence of oxygen to give water and carbon dioxide.The balanced chemical reaction is given as:

Whereas in synthesis reaction is type of chemical reaction in which two more reactant reacts together to form a single product.

A + D +C → D

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.