Chemical reaction
A chemical reaction is a process that always results in the interconversion of chemical substances. The substance or substances initially involved in a chemical reaction are called reactants....
to occur.
Chemical reaction is a concept related to the transformation of a chemical substance through its interaction with another, or as a result of its interaction with some form of energy.
In a chain of chemical reactions, molecules that accept electrons from an electron donor and pass these to an electron acceptor.
electron configuration - (n.)
The arrangement of an atom's electrons in space.
photochemical reaction A chemical reaction which involves either the absorption or emission of radiation.
OXIDATION - Chemical reaction in which electrons are formally transferred between atoms in the reactants and products. When iron rusts it is undergoing an oxidation reaction.
chemical energy (NASA Thesaurus / NASA SP-7, 1965) Energy produced or absorbed in the process of a chemical reaction.
a chemical reaction. Instability strip A region on the HR Diagram occupied by pulsating variable stars such as Cepheids.
However, the similar results from heated controls, how the release of indicative gas tapered off, and the lack of organic molecules in soil samples all suggest that the results were the result of an abiotic chemical reaction rather than biological ...
(c) The smallest part of an element that can take part in a chemical reaction. Atoms consist of a small dense positively charged nucleus, made up of neutrons and protons, with electrons in a cloud around this nucleus.
We know that life evolved here on Earth, a product of volcanic gases, organic chemicals brought by impacting comets and meteorites, and naturally occurring chemical reactions.
as a consequence of chemical reactions within the atmosphere. This is the case for methane.
Molecular evolution in space involves several chemical reactions, each tending to yield more complex molecules than the previous.
In chemical reactions, different atoms or combinations of atoms are said to be produced or created when a reaction takes place.
If the mixture of original parent molecules has been frozen out of thermodynamic equilibrium in the nuclear ices, many chemical reactions can still take place in the molecular collision zone.
The colors we see are the result of chemical reactions, fueled by the planet's interior heat, solar ultraviolet radiation, auroral phenomena, and lightning, at varying depths below the cloud tops, seen through "holes" in the overlying clouds.
If the Sun were burning by chemical reactions it wouldn't last more than a few thousand years. The most reasonable (incorrect) answer was that the Sun's luminosity came from gravitational contraction.
Scientists of the 19th century believed that the Sun was powered by chemical reactions. However, calculations showed that a star powered on chemical energy would only last maybe a thousand years or so.
The biological processes that occur within all living organisms are chemical reactions, and most are regulated by enzymes. Without enzymes, many of these reactions would not take place at a perceptible rate.
These ‘hot titans', says Atreya, would retain their nitrogen rich atmospheres, but temperatures would rapidly accelerate chemical reactions, with so-called ‘combustion energy' dominating, ...
These light sticks work by a chemical reaction which releases light energy instead of heat, sound, or electricity as other reactions may do. The reaction is very similar to the one that occurs in the tails of fireflies! ...
Elements may undergo chemical reactions with other elements or compounds to form new compounds.
The chemical composition of the gas changes with distance from the nucleus in a complex chain of chemical reactions. The 'parent molecules' at the beginning of this chain reflect the composition of the nucleus.
Experiments showed strong chemical reactions to nutrients used.
A test for organic compounds in the soil proved negative.
So, the question of life on Mars, very important at the beginning of the 20th century, remains open at the end of the century.
Temperature also plays an important role in determining the rate and extent to which chemical reactions occur.
The residual heat of the nuclear wastes melted part of the core and created (by chemical reaction) free hydrogen, which further complicated the situation.
The process was called Electrochemical Mechanical Polishing and combined a controlled electrochemical reaction with traditional mechanical polishing. My duties were in regards to the initial conceptual testing of this process.
The vivid colors seen in Jupiter's clouds are probably the result of subtle chemical reactions of the trace elements in Jupiter's atmosphere, perhaps involving sulfur whose compounds take on a wide variety of colors, but the details are unknown.
Atom- the smallest part of an element that can take part in a chemical reaction; most of the mass of the an atom is concentrated in its nucleus, which is about .000000000001 meters (.01 angstroms) across ...
Most scientists on the Viking mission believed the positive results were attributed to the discovery of oxides in the soil, and that a chemical reaction occured when the nutrient solution was mixed with the oxides.
The smaller white spots are also giant storms. The colors we see are the result of chemical reactions occurring in the atmosphere.
Click to read .
Overview of Site
K-3 ...
By cool stuff, I mean experiments. Chemical reactions that cause containers to swell and burst, or causes a physical temperature change, or just plain smelled really bad. You know, the stuff that makes you wonder how and why.
Gas lasers are pumped by ultraviolet light, electron beams, electric current, or chemical reactions. The helium-neon laser is known for its high frequency stability, color purity, and minimal beam spread.
Sediment: (see Regolith) Solid rock or mineral fragments transported and deposited by wind, water, gravity, or ice; precipitated by chemical reactions; or secreted by organisms; accumulated as layers in loose, unconsolidated form.
This decreases the liklihood of chemical reactions making the colorful compounds that give the surface features on Jupiter and Saturn.
Meteor dust particles left by falling meteoroids can persist in the atmosphere for up to several months. These particles might affect climate, both by scattering electromagnetic radiation and by catalyzing chemical reactions in the upper atmosphere.
There was some reaction which mimiced life, but the results may have also been caused by a chemical reaction. It appears that if there is life on Mars, it will likely be found in the form of bacteria like life, at least partly underground.
number of protons, which are positively charged particles, determines the chemical properties of the atom, e.g. whether it will bond with other atoms to form molecules. The neutron, which is neutral, does not play an active role in chemical reactions.
 See also: Time, Energy, Earth, Light, Temperature
|
