Sep 23, 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 …

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 …

Oct 12, 2025 · Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Polymers make up many of the …

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.

Oct 18, 2025 · DNA is an organic chemical of complex molecular structure found in all prokaryotic and eukaryotic cells. It codes genetic information for the transmission of inherited traits.

Discover the story of the Radium Girls, women who worked in a factory with radioactive materials before the dangers were known, and learn how their experience led to reforms in workplace …

Sep 9, 2025 · oxalic acid chemical compound Also known as: ethanedioic acid Written and fact-checked by The Editors of Encyclopaedia Britannica

Hydroxide, any chemical compound containing one or more groups, each comprising one atom each of oxygen and hydrogen bonded together and functioning as the negatively charged ion …

Sep 16, 2025 · In its chemical behaviour, naphthalene shows the aromatic character associated with benzene and its simple derivatives. Its reactions are mainly reactions of substitution of …

Sep 11, 2025 · chemical bonding in benzene Benzene is the smallest of the organic aromatic hydrocarbons. It contains sigma bonds (represented by lines) and regions of high-pi electron …