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chemical change


  • WordNet 3.6
    • n chemical change (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved
    • ***


In literature:

Another advantage of exposure is, to bring the peat into a state of more active chemical change.
"Peat and its Uses as Fertilizer and Fuel" by Samuel William Johnson
The plant changes the chemicals which the animal cannot use in their crude form, into plant substances which animals can use.
"The Renewal of Life; How and When to Tell the Story to the Young" by Margaret Warner Morley
Various chemical changes are by no means uncommon.
"Intestinal Ills" by Alcinous Burton Jamison
Chemical changes also occur in the wood in drying, especially so at higher temperatures, rendering it less hygroscopic, but more brittle.
"Seasoning of Wood" by Joseph B. Wagner
When leather is subjected to heat, a chemical change takes place, although no change in appearance may be noted at the time.
"Manual of Military Training" by James A. Moss
A very great change is also effected in its chemical composition; it loses nearly all its base.
"Manures and the principles of manuring" by Charles Morton Aikman
Chemical changes in cheese-ripening, 166.
"Outlines of Dairy Bacteriology, 8th edition" by H. L. Russell
Primarily this is a chemical change consequent on a rise of temperature.
"Essays: Scientific, Political, & Speculative, Vol. I" by Herbert Spencer
The human body is a laboratory in which chemical changes are constantly going on.
"Sex=The Unknown Quantity" by Ali Nomad
In the plant, this food undergoes such chemical changes as are necessary to growth.
"The Elements of Agriculture" by George E. Waring
This view, as applied to chemical changes, was first advanced by A.W.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1" by Various
Neither can I admire the correspondent's sudden and peculiar change of method in dealing with the chemical manure trade.
"Are we Ruined by the Germans?" by Harold Cox
The bite of an angry person is sometimes poisonous, because of this chemical change.
"The Colored Girl Beautiful" by E. Azalia Hackley
The chemical changes undergone by the milk during the preparation of keffir are confined almost exclusively to the milk sugar.
"The Bacillus of Long Life" by Loudon Douglas
It is the energy that enables the leaf-green to produce a wonderful chemical change.
"Earth and Sky Every Child Should Know" by Julia Ellen Rogers
To produce the colouration of the leaf just before it falls certain subtle chemical changes in its composition take place.
"Trees and Shrubs for English Gardens" by Ernest Thomas Cook
The exact course of the chemical change which occurs during the passage of wood into coal is at present involved in obscurity.
"Coal" by Raphael Meldola
They constitute the active material of protoplasm, in which all of the chemical changes which go to make up the vital phenomena take place.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
In a mixture there is no chemical change in the molecules of the substances mixed.
"Nature's Miracles, Volume 1" by Elisha Gray
A plasmic substance causes definite chemical and physical changes only when it is present in a certain condition of motion.
"A Mechanico-Physiological Theory of Organic Evolution" by Carl Von Nägeli

In news:

The voluntary change comes in response to a California law that sets limits on chemicals known to cause cancer or reproductive toxicity.
Chapter six of 'Boom, gloom and the new normal - how Western baby boomers are changing global chemical demand patterns, again' is now available for download.
Their water consumption did not change, but they drank far more alcohol after being injected with the appetite-increasing chemical .
If you just got done filling the sprayer 's tank with chemicals, and it now has difficulty to get the machine to spray the right "gallons per acre," ask yourself, "What changed".
The following changes will be made to D6875 Standard Test Method for Solidification Point of Industrial Organic Chemicals by Thermistor : Add D6809 to referenced documents in Section 2.
A chemical found in many common products, including plastic bottles and canned food linings, is linked in a new study to thyroid hormone changes in pregnant women and baby boys.
We introduce the ICIS Top 40 Power Players for 2012 - the leaders that are changing the face of the global chemical sector through investments, acquisitions, restructuring and innovative ways to do business.
Changing the chemical properties of some mind-altering drugs has allowed pushers to market them under innocent-sounding names such as " bath salts" for years.
The chemical society released the report on Monday at news conference here at which speakers discussed ways that doctoral training needed to change to.
Responsible Distribution has changed chemical logistics for the better .
Exposure to water or chemicals can cause the composition of fireworks to change, making them hazardous materials.
Scientists are surprised by chemical changes at such freezing-cold temperatures.
Doctoral training must change to help meet society's needs and produce new jobs, says the American Chemical Society in a report that calls for broad reforms.
Maintenance Ludeca's Rotalign Ultra Live Monitors Machine Position Changes Chemical Processing.
When we experience a traumatic event our brain goes through a chemical change and the military is studying these changes in the brain with PET scans.

In science:

The interface moves, and the fractions of particles in the different states change till chemical potential of the two states become equal.
Epigenetic Chromatin Silencing: Bistability and Front Propagation
For a potential V (r) with spherical symmetry, the local chemical potential is changed to µ − V (r), with µ the global chemical potential.
Recent developments in Quantum Monte-Carlo simulations with applications for cold gases
After the chemical freeze-out momentum spectra of the different particle species still change.
A Quick Tour of Ultra-Relativistic Heavy-Ion Physics at the LHC
This leads to “chemical freeze-out”: While maintaining some degree of local kinetic equilibrium through quasi-elastic resonance scattering, the final stable hadron yields hardly change any more.
Collective flow and viscosity in relativistic heavy-ion collisions
In the SM, the Universe was hot and dense enough to drive thermonuclear reactions that changed the chemical composition of the matter.
These are important when changes (due to mixing and chemical reactions) occur.
The Physics and Mathematics of the Second Law of Thermodynamics
It can consist of a mixture of several chemical species, even reactive ones, in which case the amount of the different components might change as the external parameters (e.g., the volume) change. A simple system need not be spatially homogeneous.
The Physics and Mathematics of the Second Law of Thermodynamics
Once CH has been established for arbitrary products of simple systems the entropy principle for all adiabatic state changes, except for mixing of different substances and chemical reactions, follows from the considerations of Sects.
The Physics and Mathematics of the Second Law of Thermodynamics
However, it is known that because the neutrino opacity changes with neutrino energy, the spectrum of neutrinos deviates from the pure FD distribution with zero chemical potential.
Future Detection of Supernova Neutrino Burst and Explosion Mechanism
The specific relation (9) between the spatial changes of density and temperature is due to the fact that in a general relativistic Boltzmann gas in collision–dominated equilibrium the chemical potential µ divided by T is spatially constant.
Galaxy Formation -- a Condensation Process just after Recombination
Noting the change in scale on the G(t) axis and comparing with Fig. 1 we see that in the chirally symmetric phase a strong signal develops for the spectral scalar which increases with chemical potential.
Lattice Simulation of Diquark Condensation in Dense Matter
The χc is obtained from the change of the free energy due to a small shift of chemical potential µ, δF = χcµ2/2.
One Dimensional Kondo Lattice Model Studied by the Density Matrix Renormalization Group Method
The data tentatively suggest that double winds occur when the star undergoes a change (pulsational mode, chemical composition) and that the narrow components represent the onset of a new phase of mass loss.
Princeton University Observatory Annual Report, 1997-98
In that way one obtains a snap-shot of the dense matter fireball, taken when strange hadrons stop changing in number, i.e., at the chemical freeze-out.
Quo Vadis Strangeness? Strangeness - Open Questions
To the extent the emission spectra of quasars reflect the abundances of elements like C, N, and O, one might expect to see changes as a result of the chemical evolution expected in the host galaxies of quasars over cosmological time scales.
A Review of Line and Continuum Correlations in AGNs