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  • Chemical bonding | Definition, Types, Examples | Britannica
    Chemical bonding, any of the interactions that account for the association of atoms into molecules, ions, crystals, and other species When atoms approach one another, their electrons interact and tend to distribute themselves in space so that the total energy is lower than it would be in any alternative arrangement
  • Chemical reaction | Definition, Equations, Examples, Types - Britannica
    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 chemical elements or compounds A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products
  • Polarity | Definition Examples | Britannica
    Polarity, in chemical bonding, the distribution of electrical charge over the atoms joined by the bond While bonds between identical atoms such as two of hydrogen are electrically uniform in that both hydrogen atoms are electrically neutral, bonds between atoms of different elements are electrically inequivalent
  • Hydrolysis | Definition, Examples, Facts | Britannica
    Hydrolysis, in chemistry and physiology, a double decomposition reaction with water as one of the reactants The other reactants, and the products of hydrolysis, may be neutral molecules, as in most hydrolyses involving organic compounds, or ionic molecules, as in hydrolyses of salts, acids, and bases
  • Chemical energy | Definition Facts | Britannica
    What happens to chemical bonds when a chemical reaction takes place? According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds Energy is absorbed to break bonds, and energy is evolved as bonds are made
  • Covalent bond | Definition, Properties, Examples, Facts | Britannica
    Covalent bond, in chemistry, the interatomic linkage that results from the sharing of an electron pair between two atoms The binding arises from the electrostatic attraction of their nuclei for the same electrons A bond forms when the bonded atoms have a lower total energy than that of widely separated atoms
  • Hydrogen bonding | Definition, Examples, Facts | Britannica
    Hydrogen bonding, interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons; such a bond is weaker than an ionic bond or covalent bond but stronger than van der Waals forces Hydrogen bonds can exist between atoms in different molecules or in the same molecule
  • Ionic bond | Definition, Properties, Examples, Facts | Britannica
    Ionic bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom Learn more about ionic bonds in this article
  • Chemical bonding - Conservation, Mass, Law | Britannica
    Chemical bonding - Conservation, Mass, Law: The crucial transformation of chemistry from a collection of vain hopes and alchemical meddlings to a corpus of reliable quantitative knowledge hinged on the contributions of the French aristocrat Antoine-Laurent Lavoisier (and his wife, Marie-Anne), shortly before he lost his head to the guillotine
  • DNA | Definition, Discovery, Function, Bases, Facts, Structure . . .
    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 The structure of DNA was described in 1953, leading to further understanding of DNA replication and hereditary control of cellular activities





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