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

a. they are both space stations

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under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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