chemistry

In the scope of its subject, chemistry occupies an intermediate position between physics and biology.[4] It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level.[5] For example, chemistry explains aspects of plant chemistry (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (), and how to collect DNA evidence at a crime scene.

Chemistry addresses topics such as how atoms and molecules interact via chemical bounds to form new chemical compounds.There are four types of chemical bonds: covalent bonds, in which compounds share one or more electron(s); ionic bonds, in which a compound donates one or more electrons to another compound to produce ions (cations and anions); hydrogen bonds; and van daar bonds.