GENERIC NAME: enalapril. DRUG CLASS AND MECHANISM: Enalapril is a drug that is used for treating high blood pressure. It is in a class of drugs called angiotensin converting enzyme (ACE) inhibitors. ACE is an enzyme in the body that causes the formation of angiotensin II.
RECOMMENDED LESSONS: Chemical energy. Chemical Energy is energy stored in the bonds of chemical compounds (atoms and molecules). It is released in a chemical reaction, often producing heat as a by product (exothermic reaction) . Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy.
As you said, it's true that breaking bonds always absorbs energy. But breaking bonds is just halfway through for a chemical reaction. Forming new ones releases energy. The difference within determines a chemical reaction endothermic or exothermic. For ATP hydrolysis, the bonds within an ATP and a water molecule break, which absorbs energy, as you might think. Then the new bonds formation to form an ADP and a phosphate releases a lot of energy.