Final answer:
Chemiluminescence refers to the emission of light ('A') as a result of a chemical reaction ('C'), without the need for high temperatures.
Step-by-step explanation:
Chemiluminescence refers to both A. Light emitted and C. A chemical reaction. This phenomenon occurs when a chemical reaction results in the release of energy in the form of light. Unlike processes such as incandescence, where light is produced by heating an object until it glows, chemiluminescence does not rely on high temperatures, and therefore, very little heat is emitted in this process.
For example, in glow sticks, the chemiluminescent process occurs when suitable substances are mixed, and the energy released by the chemical reaction is directly converted into light energy, which is visible as the glow. This is one of the diverse manners in which light can be generated, contrasting with methods such as the heating of an object or passing electrical currents through gases, as seen in incandescent and fluorescent lights respectively.