1,509 chemistry terms and definitions in one place, written for students, teachers, and the endlessly curious. Build your chemistry vocabulary the clear way: answer first, then the detail, an example, key facts, and the questions people actually ask.
Every term is filed under the branch of chemistry it belongs to, so you can wander a subject or jump straight to a definition.
The core ideas the rest of chemistry builds on. Start here for atoms, elements, compounds, the mole, and how chemical formulas work.
Explore topic →571 termsThe why behind chemical change. How energy, heat, reaction speed, and equilibrium decide what reactions do.
Explore topic →188 termsHow chemists find out what a sample is made of, and how much. Titration, spectroscopy, chromatography, and the tools that measure it.
Explore topic →143 termsThe chemistry of metals, minerals, and everything not built on carbon chains. Acids and bases, salts, and periodic-table trends.
Explore topic →147 termsThe chemistry of carbon. Hydrocarbons, functional groups, and the reactions that make fuels, plastics, and living things.
Explore topic →74 termsThe chemistry inside living things. Proteins, enzymes, carbohydrates, fats, and DNA, and the reactions that keep cells running.
Explore topic →The chemistry terms students, teachers, and professionals look up most, each one clearly and accurately defined.
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