- Exithermic Reaction - Reactions that give off quantities of heat such as the explosion of dynamite.
- In fossil fuels, the chemical bonds between atomic structures are broken down. The energy released by this process is used to produce heat. This type of chemical energy is generally not renewable.
- Other types of chemical energy are renewable including such things as the heat put out by our own bodies.
An example of chemical energy is energy gained by eating food, which is then converted to heat and kinetic energy during respiration.
An example of chemical energy with an exithermic reaction is when a stick of dynamite explodes. The TNT molecule is converted to water, carbon dioxide and carbon monoxide. Many bonds are broken and the energy supplied by the bonds breaking provides the energy to form the new bonds. The excess energy creates the visible explosion.
An example of chemical energy with an endothermic reaction is a chemical ice pack. When the pack is broken and the chemicals inside mix, the reaction draws heat from the environment, thus you feel cold.