Which process requires energy to decompose a
substance?

electrolysis

Explanation:

Electrolysis is one process that requires energy to decompose a substance into another one.

Electrolysis is a chemical process which converts electrical energy into chemical energy.

This process actually involves the decomposition of ionic compounds when electric current is passed through into an aqueous solution or molten form of the compound via the electrodes.

explanation:

detials on each model with digrams

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.