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- Chemistry | Definition, Topics, Types, History, & Facts | Britannicachemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
- Chemistry - WikipediaIt is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances. [2][3][4][5] Chemistry also addresses the nature of chemical bonds in ...
- What Is a Chemical? Definition and Examples - Science Notes and ProjectsIn everyday usage, a “chemical” often refers to an undesirable additive or contaminant. For example, pesticides in water or artificial colorings in food are “chemicals.” But, chemistry sees chemicals somewhat differently. A chemical is a substance with a specific composition.
- What is a Chemical - NRCThe Nuclear Regulatory Commission's Science 101: What is a Chemical? A chemical is any substance that has a defined composition. In other words, a chemical is always made up of the same "stuff." Some chemicals occur in nature, such as water. Other chemicals are manufactured, such as chlorine (used for bleaching fabrics or in swimming pools).
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