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Chemical change   /kˈɛməkəl tʃeɪndʒ/   Listen
Chemical change

noun
1.
(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved.  Synonyms: chemical action, chemical process.






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"Chemical change" Quotes from Famous Books



... the property of rising on dough or paste made of Rice flour. But as an article of sustenance Rice is not well suited for persons of fermentative tendencies during the digestion of their food, because its starch is liable to undergo this chemical change in ...
— Herbal Simples Approved for Modern Uses of Cure • William Thomas Fernie

... explaining to Elliott and me the chemical change that takes place in the leaves, that makes the beautiful autumn colours we were admiring so much," said Rose. "He is great in botany and chemistry, ...
— Janet's Love and Service • Margaret M Robertson

... can't tell," answered the young father. "Perhaps selfish people shouldn't have children; or perhaps it's the children that make us unselfish, and so keep us happy. Maybe it's one of those intricate psychical reactions, like a chemical change—I don't know! But I do know the kids are the best things in ...
— In the Heart of a Fool • William Allen White

... chemical change in a body as the effect of the action of something external to the body changed. A chemical compound once formed would persist for ever, if no alteration took place ...
— Science & Education • Thomas H. Huxley

... fluids out, but by putting something in—a great Love, a new Spirit, the Spirit of Christ. Christ, the Spirit of Christ, interpenetrating ours, sweetens, purifies, transforms all. This only can eradicate what is wrong, work a chemical change, renovate and regenerate, and rehabilitate the inner man. Will-power does not change men. Time ...
— Addresses • Henry Drummond

... and she knew she was safe. She might sleep without fear. This man would not harm her any more than Beresford or Morse would have done. Some chemical change had occurred in his thoughts that protected her. She did not know what it was, but her paean of prayer went up to heaven in a little rush ...
— Man Size • William MacLeod Raine

... slightly modified in the process of digestion and absorption that after reaching the blood and the tissues they are reconstructed into the original form in which they are eaten, that is, beef fat is deposited in the tissues as beef fat without undergoing any chemical change whatever; mutton fat is deposited as mutton fat; lard as pig fat, etc. When the body makes its own fat from starch or sugar, the natural source of this tissue element, the product formed is sui generis and must be ...
— Northern Nut Growers Association Report of the Proceedings at the Sixth Annual Meeting. Rochester, New York, September 1 and 2, 1915 • Various

... to it which, in dry soils, is all that is necessary. Whoever has examined a pile of cannon-balls must have observed that at the points where they touch each other, there is a little rust. In the soil, the same is often the case. Where the particles touch each other, there is such a chemical change produced as renders them fit for the use of plants. While these particles remain in their first position, the changed portions are out of the reach of roots; but, if, by the aid of the sub-soil plow, their position is altered, these parts are exposed ...
— The Elements of Agriculture - A Book for Young Farmers, with Questions Prepared for the Use of Schools • George E. Waring

... expressions of what holds good in a large number of chemical processes; finally, he will discover that some generalisations have been made which are exact and completely accurate descriptions applicable to every case of chemical change. ...
— The Story of Alchemy and the Beginnings of Chemistry • M. M. Pattison Muir

... not attended with so great increase of heat as in the former genus, because the fluids probably undergo less chemical change in the glands of the absorbent system; nor are the glands of the absorbent vessels so numerous or so extensive as those of the secerning ones. Yet that some heat is produced by the increased action of the absorbents appears from the greater general warmth of the ...
— Zoonomia, Vol. II - Or, the Laws of Organic Life • Erasmus Darwin

... The rays of light at the violet end of the spectrum; also the invisible rays beyond such end, or the ether waves of short periods which most strongly induce chemical change. ...
— The Standard Electrical Dictionary - A Popular Dictionary of Words and Terms Used in the Practice - of Electrical Engineering • T. O'Conor Slone

... lacking, and for it an infinitesimal something had been substituted. The change from hour to hour was not perceptible; from week to week it was. The stillness grew in portent; the forest creatures moved more furtively. Like growth, rather than chemical change; the wilderness was turning to iron. With this hardening it became more formidable and menacing. No longer aloof in nirvanic calm, awakened it drew near its enemies, alert, ...
— The Silent Places • Stewart Edward White

... the chemist. So at about the time when the microscope had taught that the cell is the really essential structure of the living organism, the chemists had come to understand that every function of the organism is really the expression of a chemical change—that each cell is, in short, a miniature chemical laboratory. And it was this combined point of view of anatomist and chemist, this union of hitherto dissociated forces, that made possible the inroads into the unexplored fields of physiology that were effected ...
— A History of Science, Volume 4(of 5) • Henry Smith Williams

... bacterium pyogenes, the bacillus subtilis, the staphylococci, the bacterium coli commune? They all play a part in the game, reducing the body in time to a charnel-house. Or are such substances as putrescein, cadaverin, skatol or indol—which are derived through chemical change in the putrescent mass—contributors to the spread of the poisonous taint throughout the system? Any single one or a group of the fifty or more bacterial poisons may be the responsible agents in the ensuing auto-infection. ...
— Intestinal Ills • Alcinous Burton Jamison

... man, I have occasionally thought of this endeavor at which you hint. We exist—you and I and all the others—in what we glibly call the universe. All that we know of it is through what we entitle our five senses, which, when provoked to action, will cause a chemical change in a few ounces of spongy matter packed in our skulls. There are no grounds for believing that this particular method of communication is adequate, or even that the agents which produce it are veracious. Meanwhile, we are in touch with what exists through our five senses only. ...
— The Certain Hour • James Branch Cabell

... position between Green tea and Black Souchongs and Congous, the leaves are first exposed to the action of the air for a considerable time, and in many cases, to the sun also. An incipient fermentation may take place, although this is denied by some. There is certainly a chemical change beyond the brief preliminary drying of Green tea. During this period the leaves (in China) are stirred and tossed by the hands. The effect, if not the object, is to expose greater surfaces to the air, and to increase oxidation. It is during this operation that the leaves first ...
— Tea Leaves • Francis Leggett & Co.

... the bottom-board, as the bees work it out very often. Another object in feeding bees, is to give inferior honey, mixed with sugar and flavored to suit the taste, to the bees, and let them store it in boxes for market. Now, I have no faith in honey undergoing any chemical change in the stomach of the bee,[14] and cannot recommend this as the honest course. Neither do I think it would be very profitable, feeding to this extent, under any circumstances. I have a few times had some boxes nearly finished and fit for ...
— Mysteries of Bee-keeping Explained • M. Quinby

... animals. Admitting that crotalus venom may be present, the introduction into the human circulation of this substance would without doubt produce death and not paralysis of the facial muscles, and if taken into the stomach it quickly undergoes chemical change when brought in contact with the gastric juice, as is well known from experiments made by several well known physiologists, and particularly by Dr. Coxe (Dispensatory, 1839), who employed the contents of the venom sack, mixed with bread, for the ...
— Seventh Annual Report • Various



Words linked to "Chemical change" :   corrosion, swelling, chemical mechanism, activity, proteolysis, cracking, chlorination, deaminization, calcification, demineralisation, peptisation, natural action, digestion, syneresis, mechanism, gasification, intumescency, de-iodination, chemical reaction, gassing, chemical action, precipitation, zymolysis, cleavage, demineralization, catalysis, intumescence, chemistry, peptization, decarboxylation, bluing, synaeresis, chelation, polymerization, desalination, fermentation, dissociation, decalcification, agglutination, photosynthesis, nitrification, ferment, blueing, corroding, iodination, pyrochemical process, inversion, zymosis, desalinization, agglutinating activity, desalinisation, natural process, reaction, erosion, fermenting, chemical science, association, transamination, action, polymerisation, deamination, contact action, pyrochemistry, synthesis, amylolysis, acylation, sequestration, hydrogenation



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