A large proportion of healthy African Americans have been observed to have a white blood cell count (WBC) that is persistently lower than the normal range defined for individuals of European ancestry [1]â[5].
Energy is only released when chemical bonds are formed. In general, a chemical reaction involves two steps: 1) the original chemical bonds between the atoms are broken, and 2) new bonds are formed. These two steps are sometimes lumped into one event for simplicity, but they are really two separate events.
This potential energy is converted into kinetic energy as it falls. Chemical energy is produced or absorbed in the process of a chemical reaction. When chemicals mix they can release heat (exothermic reaction) or require heat (endothermic reaction). Source(s): Google.