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  1. Chemical Definition & Meaning | Britannica Dictionary

    CHEMICAL meaning: 1 : of or relating to chemistry; 2 : working by means of chemicals

  2. Chemistry | Definition, Topics, Types, History, & Facts | Britannica

    5 days ago · Chemistry is the science of the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is …

  3. Chemical compound | Definition, Examples, & Types | Britannica

    Dec 16, 2025 · All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.

  4. Chemical element | Definition, Origins, Distribution, & Facts | Britannica

    Jan 9, 2026 · A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is …

  5. Solution | Definition & Examples | Britannica

    Jan 19, 2026 · Solution, in chemistry, a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility.

  6. Metal | Definition, Characteristics, Types, & Facts | Britannica

    Jan 21, 2026 · Metal, any of a class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light. Approximately three …

  7. Mole | Definition, Number, & Facts | Britannica

    Jan 19, 2026 · A mole is defined as 6.02214076 × 10 23 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, …

  8. Corrosion | Oxidation, Electrochemical, & Rusting | Britannica

    Jan 5, 2026 · What is oxidation in chemistry? Oxidation is a chemical process where an atom, ion, or molecule loses electrons as it interacts with another chemical species, altering its composition and …

  9. Base | Definition, Examples, & Facts | Britannica

    Dec 12, 2025 · Base, in chemistry, any substance that in water solution is slippery to the touch, tastes bitter, changes the color of indicators (e.g., turns red litmus paper blue), reacts with acids to form …

  10. Carbohydrate | Definition, Classification, & Examples | Britannica

    Jan 23, 2026 · A carbohydrate is a naturally occurring compound, or a derivative of such a compound, with the general chemical formula C x (H 2 O) y, made up of molecules of carbon (C), hydrogen (H), …