Science, Tech, Math › Science Chemical Definition Chemistry Glossary Definition of Chemical Share Flipboard Email Print Comstock / Getty Images Science Chemistry Chemical Laws Basics Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated May 08, 2019 There are two definitions of the word "chemical" as the term is used in chemistry and common usage: Chemical Definition (adjective) As an adjective, the term "chemical" indicates a relationship to chemistry or to the interaction between substances. Used in a sentence: "She studied chemical reactions.""They determined the chemical composition of the soil." Chemical Definition (noun) Everything which has mass is a chemical. Anything consisting of matter is a chemical. Any liquid, solid, gas. A chemical includes any pure substance; any mixture. Because this definition of a chemical is so broad, most people consider a pure substance (element or compound) to be a chemical, particularly if it is prepared in a laboratory. Examples of Chemicals Examples of things which are chemicals or consist of them include water, pencil, air, carpet, light bulb, copper, bubbles, baking soda, and salt. Of these examples, water, copper, baking soda, and salt are pure substances (elements or chemical compounds. A pencil, air, carpet, a light bulb, and bubbles consist of multiple chemicals. Examples of things which are not chemicals include light, heat, and emotions.