#chemical_reaction__reaction  (chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water"
  supertype:  #chemical_process__chemical_change__chemical_action  any process determined by the atomic and molecular composition and structure of the substances involved
  subtype:  #addition_reaction  a chemical reaction in which one molecule is added to another
  subtype:  #aldol_reaction__aldolreaction  a reaction of aldehydes resulting in an aldol
  subtype:  #chain_reaction__chainreaction  a series of chemical reactions in which the product of one is a reactant in the next
  subtype:  #chemical_equilibrium__equilibrium  a chemical reaction and its reverse proceed at equal rates
     subtype:  #acid-base_equilibrium__acid-base_balance  (physiology) the normal equilibrium between acids and alkalis in the body; "with a normal acid-base balance in the body the blood is slightly alkaline"
  subtype:  #decomposition_reaction__decompositionreaction__decomposition  (chemistry) chemical separation of a substance into two or more substances that may differ from each other and from the original substance
  subtype:  #displacement_reaction__displacement  (chemistry) a chemical reaction in which an elementary substance displaces and sets free a constituent element from a compound
  subtype:  #double_decomposition_reaction__double_decomposition__metathesis  a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB)
     subtype:  #double_replacement_reaction__doublereplacementreaction  a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound
  subtype:  #elimination_reaction__eliminationreaction  a chemical reaction in which a molecule decomposes to two different molecules
  subtype:  #endothermic_reaction__endothermicreaction  a chemical reaction accompanied by the absorption of heat
  subtype:  #exothermic_reaction  a chemical reaction accompanied by the evolution of heat
  subtype:  #hydrolysis  a chemical reaction in which water reacts with a compound to produce other compounds; involves the splitting of a bond and the addition of the hydrogen cation and the hydroxide anion from the water
  subtype:  #neutralization_reaction__neutralization__neutralisation__neutralisation_reaction  a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water
  subtype:  #oxidation__oxidization__oxidisation  the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction
     subtype:  #calcination  the conversion of metals into their oxides as a result of heating to a high temperature
     subtype:  #combustion__burning  a process in which a substance reacts with oxygen to give heat and light
        subtype:  #flame__fire__flaming  the process of combustion of inflammable materials producing heat and light and (often) smoke; "fire was one of our ancestors' first discoveries"
           subtype:  #blazing__blaze  a strong flame that burns brightly; "the blaze spread rapidly"
           subtype:  #flare.flame  a sudden burst of flame
        subtype:  #internal_combustion  the combustion of fuel inside a cylinder (as in an internal-combustion engine)
     subtype:  #nitrification  the oxidation of ammonium compounds into nitrates by soil bacteria
     subtype:  #rusting__rust  the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water
  subtype:  #oxidation-reduction__oxidationreduction__oxidoreduction__redox  a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction
  subtype:  #photochemical_reaction__photochemicalreaction  a chemical reaction produced by the action of light
     subtype:  #light_reaction__lightreaction  the first stage of photosynthesis during which energy from light is used for the production of ATP
  subtype:  #reduction.chemical_reaction__reducing  any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent
  subtype:  #saponification  a chemical reaction in which an ester is heated with an alkali (especially the alkaline hydrolysis of a fat or oil to make soap)

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