
What Is a Chemical? Definition and Examples
Oct 15, 2023 · Chemicals come in various forms depending on their composition, structure, and how they interact with other substances. Understanding the main types of chemicals helps …
Chemistry | Definition, Topics, Types, History, & Facts ...
Dec 26, 2025 · chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the …
What is a Chemical ? | Nuclear Regulatory Commission - NRC
Chemical changes are different from physical changes, which don't result in a change in substances. One example of a physical change is when water freezes into ice. While ice may …
Substance (chemistry) - Wikipedia
Chemical substances can exist in several different physical states or phases (e.g. solids, liquids, gases, or plasma) without changing their chemical composition. Substances transition …
PubChem
Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature …
Chemicals, Pesticides and Toxics Topics | US EPA
May 15, 2025 · Learn how to safely handle chemicals, the effects of certain toxins, which substances are controlled or managed, and safer alternatives.
CHEMICAL Definition & Meaning - Merriam-Webster
The meaning of CHEMICAL is of, relating to, used in, or produced by chemistry or the phenomena of chemistry. How to use chemical in a sentence.