chemical change

If you are waiting for some bananas to ripen, you are waiting for a chemical change. A chemical change occurs when a new substance is formed through a chemical reaction like when fruit ripens or rots.

When something undergoes a "chemical reaction" and a new substance is formed as a result, we call this chemical change. In some instances, simply applying heat can cause a chemical change. Cooking pancakes, for instance, is an example of a chemical change; the pancake batter "changes" from a liquid to a solid. Rust forming on metal is another example of a chemical change. The iron reacts with water and oxygen to create a new substance — rust.

DEFINITIONS OF: chemical change

1

n (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

Synonyms:
chemical action, chemical process
Types:
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acylation
the process of introducing an acyl group into a compound
agglutinating activity, agglutination
the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated
amylolysis
conversion of starch to sugar
association
(chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding
blueing, bluing
a process that makes something blue (or bluish)
calcification
a process that impregnates something with calcium (or calcium salts)
catalysis, contact action
acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction
chelation
the process of forming a ring by forming one or more hydrogen bonds
chemical reaction, reaction
(chemistry) a process in which one or more substances are changed into others
chlorination
the addition or substitution of chlorine in organic compounds
cleavage
the breaking of a chemical bond in a molecule resulting in smaller molecules
corroding, corrosion, erosion
erosion by chemical action
cracking
the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process)
deamination, deaminization
removal of the amino radical from an amino acid or other amino compound
decalcification
loss of calcium from bones or teeth
decarboxylation
the process of removing a carboxyl group from a chemical compound (usually replacing it with hydrogen)
de-iodination
the removal of iodine atoms from organic compounds
demineralisation, demineralization
the removal of minerals and mineral salts from a liquid (especially from water)
desalination, desalinisation, desalinization
the removal of salt (especially from sea water)
digestion
the process of decomposing organic matter (as in sewage) by bacteria or by chemical action or heat
dissociation
(chemistry) the temporary or reversible process in which a molecule or ion is broken down into smaller molecules or ions
gasification
the process of changing into gas
gassing
the process of interacting with gas
hydrogenation
a chemical process that adds hydrogen atoms to an unsaturated oil
intumescence, intumescency, swelling
the increase in volume of certain substances when they are heated (often accompanied by release of water)
inversion
a chemical process in which the direction of optical rotation of a substance is reversed from dextrorotatory to levorotary or vice versa
iodination
the substitution or addition of iodine atoms in organic compounds
chemical mechanism, mechanism
the atomic process that occurs during a chemical reaction
nitrification
the chemical process in which a nitro group is added to an organic compound (or substituted for another group in an organic compound)
peptisation, peptization
the process of converting to a sol; bringing to a colloidal solution
photosynthesis
synthesis of compounds with the aid of radiant energy (especially in plants)
polymerisation, polymerization
a chemical process that combines several monomers to form a polymer or polymeric compound
precipitation
the process of forming a chemical precipitate
proteolysis
the hydrolysis of proteins into peptides and amino acids by cleavage of their peptide bonds
pyrochemical process, pyrochemistry
processes for chemical reactions at high temperatures
sequestration
the action of forming a chelate or other stable compound with an ion or atom or molecule so that it is no longer available for reactions
synaeresis, syneresis
the separation of liquid from a gel that is caused by contraction (as in cheese making)
synthesis
the process of producing a chemical compound (usually by the union of simpler chemical compounds)
transamination
the process of transfering an amino group from one compound to another
transamination
the process of transposing an amino group within a chemical compound
ferment, fermentation, fermenting, zymolysis, zymosis
a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol
acetylation
the process of introducing an acetyl group into a compound
addition reaction
a chemical reaction in which one molecule is added to another
aldol reaction
a reaction of aldehydes resulting in an aldol
autocatalysis
catalysis in which the catalyst is one of the products of the reaction
biochemical mechanism
a chemical mechanism involved in vital processes occurring in living organisms
biogenesis, biosynthesis
production of a chemical compound by a living organism
bottom fermentation
a slow kind of alcoholic fermentation at a temperature low enough that the yeast cells can sink to the bottom of the fermenting liquid; used in the production of lager
chain reaction
a series of chemical reactions in which the product of one is a reactant in the next
chemical equilibrium, equilibrium
a chemical reaction and its reverse proceed at equal rates
chemosynthesis
synthesis of carbohydrate from carbon dioxide and water; limited to certain bacteria and fungi
chemical decomposition reaction, decomposition, decomposition reaction
(chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
displacement, displacement reaction
(chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound
double decomposition, double decomposition reaction, metathesis
a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB)
elimination reaction
a chemical reaction in which a molecule decomposes to two different molecules
endothermic reaction
a chemical reaction accompanied by the absorption of heat
exothermic reaction
a chemical reaction accompanied by the evolution of heat
hydration
the process of combining with water; usually reversible
hydrocracking
the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst
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
neutralisation, neutralisation reaction, neutralization, neutralization 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
nucleosynthesis
(astronomy) the cosmic synthesis of atoms more complex than the hydrogen atom
ossification
the calcification of soft tissue into a bonelike material
oxidation, oxidisation, oxidization
the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction
oxidation-reduction, oxidoreduction, redox
a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction
photochemical reaction
a chemical reaction produced by the action of light
indentation, pitting, roughness
the formation of small pits in a surface as a consequence of corrosion
prechlorination
chlorination prior to another chemical process
reducing, reduction
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
rust, rusting
the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water
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)
solvation
a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound
top fermentation
a violent kind of alcoholic fermentation at a temperature high enough to carry the yeast cells to the top of the fermenting liquid; used in the production of ale
vinification
the process whereby fermentation changes grape juice into wine
Type of:
action, activity, natural action, natural process
a process existing in or produced by nature (rather than by the intent of human beings)
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