What Is a Chemical? Definition and Examples - Science Notes and …
Oct 15, 2023 · A chemical is any substance with a definite composition and distinct properties. All matter is made of chemicals, …
PubChem
Search and explore chemical information in the world's largest free chemistry database. Search chemicals by name, molecular …
Chemistry - Wikipedia
Chemical reactions usually involve the making or breaking of chemical bonds. Oxidation, reduction, dissociation, acid–base …
Periodic Table of Elements - PubChem
Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element …
Element List – Element Names, Symbols, and Atomic Numbers
May 17, 2014 · This element list includes the names, symbols, and atomic numbers of all 118 chemical elements, arranged in order …
Substance (chemistry) - Wikipedia
In chemistry, a substance is a unique form of matter with constant chemical composition and characteristic properties. [1][2] …
Chemistry | Definition, Topics, Types, History, & Facts | Britannica
May 22, 2026 · Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of …
Chemical reaction | Definition, Equations, Examples, & Types - Britannica
May 25, 2026 · Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the …
12 Types of Chemicals Explained | Uses, Examples & Safety Tips
Aug 28, 2025 · Learn about 12 types of chemicals with examples, uses, and safety tips. Explore acids, bases, polymers, …
Zperiod: Interactive Periodic Table (118 Elements, 3D Atom Models)
All 118 elements with category color-coding, phase data at STP, and instant access to comprehensive chemical information. …