The combustion of methane(CH4) produces energy. Where does this energy come from?

The combustion of methane produces energy that comes from the formation of bonds in the products.

Methane is a hydrocarbon formed as a result of a carbon atom bonding with 4 hydrogen atoms.

When burned in oxygen, methane produces carbon dioxide and water as products.

The breakage of the bond in the methane consumes energy while the formation of carbon dioxide and water molecules produces energy. However, the latter is much more than the former.

Thus, there is net energy that is released when methane undergoes combustion.

More on enthalpy of reactions can be found here; link

Explanation:

Combustion produces energy. Where does all this energy come from? Energy is stored in the chemical bonds that hold the carbon and hydrogen atoms together. When the atoms are rearranged, the bonds are broken, releasing energy.

elements

explanation:

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.