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.
The carbon atom shares two pairs of electrons with each of the oxygen atoms, and each of these double bonds has a bond energy of 187 kcal (or about 93 kcal for each shared pair of electrons). The larger the bond energy, the more energy is needed to break the bond. The bond energy of H-H bonds is 103 kcal. 2  The bond energy of the O=O bonds is 116 kcal. 3  The decomposition of 2 molecules of water requires breaking 4 H-O bonds and thus the input of 440 kcal. 4  The formation of 2 moles of hydrogen yields 206 kcal (2 x 103). 5  The formation of 1 mole of oxygen yields 116 kcal.