chemical change

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Noun

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

chemical action, chemical process

chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

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; "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"

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; "there was a chemical reaction of the lime with the ground water"

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; "coal gas is produced by the gasification of coal"

gassing - the process of interacting with gas

hydrogenation - a chemical process that adds hydrogen atoms to an unsaturated oil; "food producers use hydrogenation to keep fat from becoming rancid"

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; "he determined unique mechanisms for the photochemical reactions"

natural action, natural process, action, activity - a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"

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)

References in classic literature ?

"The food that one eats is supposed to undergo certain chemical changes during the process of digestion and assimilation, the result, of course, being the rebuilding of wasted tissue.

The chemical changes take place through both direct and indirect suggestion, and we live and thrive."

View in context

In each question, the teachers were asked to consider a scenario, decide whether a physical or a chemical change had occurred, and give reasons for their decision.

Straight from the professional development classroom: A practical experience

"If you can understand the landscape of a chemical change or a biological change, you might be able to alter the landscape," Zewail said after winning the Nobel Prize in chemistry.

Nobel winner Egyptian chemist Zewail, 70, dies

They looked at whether a chemical change (methylation) in the function of the SKA2 gene measured in blood predicted the thickness of brain cortex (a measure of neuronal health) and psychological symptoms, specifically PTSD and depression.

Gene may predict severity of posttraumatic stress disorder

To help teachers prepare instruction, this volume describes secondary students' ideas about science in terms of life and living processes (living things, nutrition, growth, responding to the environment, reproduction and inheritance, microbes, and ecosystems); materials and their properties (solids, liquids, gases, chemical change, particles, water, air, and rocks); and physical processes (electricity, magnetism, light, sound, heating, energy, forces, horizontal motion, gravity, and the Earth in space).

Making Sense of Secondary Science: Research Into Children's Ideas, Classic Edition

Microorganisms in cosmetics may cause spoilage or chemical change in the product and can possibly harm consumers.

DCL steps up product testing

Effectiveness of multimedia-based instruction that emphasizes molecular representations on students' understanding of chemical change. Journal of Research in Science Teachings 41(4), 317-337.

Effect of a virtual chemistry laboratory on students' achievement

Widespread in the environment, the spores of these organisms arc more resistant than vegetative cells to physical and chemical change, and to chlorination, often surviving in water for long periods.

Lab M's new Clostridia medium

However, they all need priming and activation by roasting the physical force behind the chemical change.

Essence of coffee roasting: the striking thing about coffee roasting is that so much happens in a short space of time. Attempts to describe every last detail invariably turn a functional and sequential description, into a mess mired by minutiae

The temperature "switch" is reversible because it is based on a physical rather than chemical change.