| Within the ozone layer, this ultraviolet energy is absorbed by a delicate balance of two chemical reactions. |
| Zeolites can soak up liquid or gas molecules and also catalyze chemical reactions. |
| Chemists study these organisms because they are able to perform chemical reactions under extreme conditions. |
| In chemistry, thermodynamics refers to the transformations of energy associated with chemical reactions. |
| Ozone is produced when sunlight triggers chemical reactions involving reactive hydrocarbons and nitrogen oxides. |
| The rate of chemical reactions often depends on the concentration of the reactants involved. |
