Hydrogen peroxide ( H2O2 ) is used on cuts and scrapes to kill bacteria that could enter the body and cause an infection. When hydrogen peroxide is poured on a cut, it comes into contact with an enzyme called catalase. In a chemical reaction, the hydrogen peroxide breaks down into water and oxygen gas. Select the correct number from each menu below to construct a balanced chemical equation that represents the chemical reaction.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.