chemical reactions in living things - Search
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  2. Plastic | Composition, History, Uses, Types, & Facts | Britannica

    May 28, 2025 · For the purposes of this article, plastics are primarily defined not on the basis of their chemical composition but on the basis of their engineering behaviour. More specifically, …

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

    Jun 22, 2025 · Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization. Today, vinyl, Teflon, liquid crystals, …

  4. Chemical Definition & Meaning | Britannica Dictionary

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

  5. Chemical reaction | Definition, Equations, Examples, & Types

    May 12, 2025 · A chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either …

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

    Jun 19, 2025 · Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the …

  7. Chemical element | Definition, Origins, Distribution, & Facts

    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 …

  8. Chemical reaction - Conservation, Reactants, Products | Britannica

    May 12, 2025 · Chemical reaction - Conservation, Reactants, Products: In reactions under normal laboratory conditions, matter is neither created nor destroyed, and elements are not …

  9. Weathering | Physical, Chemical & Biological Effects | Britannica

    May 28, 2025 · Weathering involves physical, chemical, and biological processes acting separately or, more often, together to achieve the disintegration and decay of rock material. …

  10. Air | Composition, Oxygen, Nitrogen | Britannica

    Air, mixture of gases comprising the Earth’s atmosphere. The mixture contains a group of gases of nearly constant concentrations and a group with concentrations that are variable in both …

  11. Chemical Banking Corporation | Merger, Acquisition, Rebranding ...

    Jul 1, 2025 · Chemical Banking Corporation, former American bank holding company that merged with The Chase Manhattan Corporation in 1996. The holding company’s principal subsidiary …