About 599,000 results
Open links in new tab
  1. Chemistry | Definition, Topics, Types, History, & Facts | Britannica

    Nov 8, 2025 · The identification of pure substances and the analysis of chemical mixtures enable all other chemical disciplines to flourish. The importance of analytical chemistry has never …

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

    Oct 10, 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 …

  3. Who Was Ed Gein’s Girlfriend, Adeline Watkins?

    Nov 10, 2025 · Although Adeline Watkins gave an interview claiming to be Ed Gein’s girlfriend for 20 years, she later said that their relationship had lasted only about seven months, during …

  4. Phosgene | Toxic Gas, Chloroformyl, Industrial Uses | Britannica

    Phosgene, a colourless, chemically reactive, highly toxic gas having an odour like that of musty hay, used in making organic chemicals, dyestuffs, polycarbonate resins, and isocyanates for …

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

    Sep 26, 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.

  6. The Horrifying History of Gas Warfare | Britannica

    But Haber was willing to pervert this chemical genius to help Germany win the war. And he set out to craft deadlier chemical weapons, leading a group of scientists the German military …

  7. How Does Metal Rust? | Science, Process, & Facts | Britannica

    Rust is the result of a chemical reaction between metal, typically iron, and oxygen in the presence of moisture. This process, known as oxidation, transforms the metal into a new compound, …

  8. Salt | Chemistry, History, Occurrence, Manufacture, Uses, & Facts ...

    Nov 14, 2025 · Salt, also called sodium chloride, mineral substance of great importance to human and animal health, as well as to industry. The mineral form halite, or rock salt, is sometimes …

  9. Chemical Definition & Meaning | Britannica Dictionary

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

  10. History, Products, Acquisition, & Facts - Britannica Money

    The company was incorporated as the Monsanto Chemical Company in 1933. Its production of styrene, a component of synthetic rubber, was vital to the U.S. war effort during World War II.