Answer :
Combustion.
Combustion reactions contain a source of fuel and water as the reactant,
And water and carbon dioxide as the product.
A chemical reaction occured because (with the spectator ions eliminated) there is a product
Combustion reactions contain a source of fuel and water as the reactant,
And water and carbon dioxide as the product.
A chemical reaction occured because (with the spectator ions eliminated) there is a product