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  2. Amphoterism - Wikipedia

    en.wikipedia.org/wiki/Amphoterism

    In organic chemistry and biochemistry, important examples include amino acids and derivatives of citric acid. Although an amphiprotic species must be amphoteric, the converse is not true. For example, a metal oxide such as zinc oxide, ZnO, contains no hydrogen and so cannot donate a proton. Nevertheless, it can act as an acid by reacting with ...

  3. Hydrogen compounds - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_compounds

    By some definitions, "organic" compounds are only required to contain carbon. However, most of them also contain hydrogen, and because it is the carbon-hydrogen bond that gives this class of compounds most of its particular chemical characteristics, carbon-hydrogen bonds are required in some definitions of the word "organic" in chemistry. [12]

  4. Hydrogen - Wikipedia

    en.wikipedia.org/wiki/Hydrogen

    By some definitions, "organic" compounds are only required to contain carbon. However, most of them also contain hydrogen, and because it is the carbon-hydrogen bond that gives this class of compounds most of its particular chemical characteristics, carbon-hydrogen bonds are required in some definitions of the word "organic" in chemistry. [ 92 ]

  5. Category:Amphoteric compounds - Wikipedia

    en.wikipedia.org/wiki/Category:Amphoteric_compounds

    Pages in category "Amphoteric compounds" The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes. ...

  6. List of biomolecules - Wikipedia

    en.wikipedia.org/wiki/List_of_biomolecules

    List of compounds; List of organic compounds; List of proteins This page was last edited on 20 February 2025, at 00:05 (UTC). Text is available under the ...

  7. Properties of water - Wikipedia

    en.wikipedia.org/wiki/Properties_of_water

    Water is amphoteric, meaning that it can exhibit properties of an acid or a base, depending on the pH of the solution that it is in; it readily produces both H + and OH − ions. [c] Related to its amphoteric character, it undergoes self-ionization. The product of the activities, or approximately, the concentrations of H + and OH −

  8. Amphiphile - Wikipedia

    en.wikipedia.org/wiki/Amphiphile

    Many biological compounds are amphiphilic: phospholipids, cholesterol, glycolipids, fatty acids, bile acids, saponins, local anaesthetics, etc. [citation needed] Soap is a common household amphiphilic surfactant compound. Soap mixed with water (polar, hydrophilic) is useful for cleaning oils and fats (non-polar, lipophilic) from kitchenware ...

  9. Hydrogen cycle - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_cycle

    Many organic compounds also contain H atoms, such as hydrocarbons and organic matter. Given the ubiquity of hydrogen atoms in inorganic and organic chemical compounds, the hydrogen cycle is focused on molecular hydrogen, H 2. As a consequence of microbial metabolisms or naturally occurring rock-water interactions, hydrogen gas can be created.