chemical - ορισμός. Τι είναι το chemical
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Τι (ποιος) είναι chemical - ορισμός

MATTER OF CONSTANT COMPOSITION BEST CHARACTERIZED BY THE ENTITIES (MOLECULES, FORMULA UNITS, ATOMS) IT IS COMPOSED OF AND CHARACTERIZED BY PHYSICAL PROPERTIES LIKE DENSITY
Chemicals; Chemical; Chemical sources; Pure substance; Chemical substances; Artificial material
  • Chemicals in graduated cylinders and beaker.
  • center
  • Colors of a single chemical ([[Nile red]]) in different solvents, under visible and UV light, showing how the chemical interacts dynamically with its solvent environment.
  • [[Potassium ferricyanide]] is a compound of potassium, iron, carbon and nitrogen; although it contains cyanide anions, it does not release them and is nontoxic.
  • Native sulfur crystals. Sulfur occurs naturally as elemental sulfur, in [[sulfide]] and [[sulfate]] minerals and in [[hydrogen sulfide]].
  • Cranberry glass, while appearing homogeneous, is a ''mixture'' consisting of glass and [[gold]] colloidal particles of about 40{{nbsp}}nm in diameter, giving it a red color.

Chemical         
·noun A substance used for producing a chemical effect; a reagent.
II. Chemical ·adj Pertaining to chemistry; characterized or produced by the forces and operations of chemistry; employed in the processes of chemistry; as, chemical changes; chemical combinations.
chemical         
(chemicals)
Frequency: The word is one of the 1500 most common words in English.
1.
Chemical means involving or resulting from a reaction between two or more substances, or relating to the substances that something consists of.
...chemical reactions that cause ozone destruction.
...the chemical composition of the ocean.
...chemical weapons.
ADJ: ADJ n
chemically
...chemically treated foods...
The medicine chemically affects your physiology.
ADV: ADV with v, ADV adj
2.
Chemicals are substances that are used in a chemical process or made by a chemical process.
The whole food chain is affected by the over-use of chemicals in agriculture.
...the chemical industry.
N-COUNT: usu pl
chemical         
¦ adjective relating to chemistry or chemicals.
?relating to or denoting the use of poison gas or other chemicals as weapons of war.
¦ noun a distinct compound or substance, especially one which has been artificially prepared or purified.
?an addictive drug.
Derivatives
chemically adverb
Origin
C16: from Fr. chimique or mod. L. chimicus, chymicus, from med. L. alchymicus, from alchimia (see alchemy).

Βικιπαίδεια

Chemical substance

A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be simple substances (substances consisting of a single chemical element), chemical compounds, or alloys.

Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, in practice, no substance is entirely pure, and chemical purity is specified according to the intended use of the chemical.

Chemical substances exist as solids, liquids, gases, or plasma, and may change between these phases of matter with changes in temperature or pressure and time. Chemical substances may be combined or converted to others by means of chemical reactions.

Παραδείγματα από το σώμα κειμένου για chemical
1. Army Chemical Materials Agency: http://www.cma.army.mil/ Chemical Weapons Working Group: http://www.cwwg.org
2. Police in chemical protection suits were at the station, but no chemical agents were found.
3. The two Indian firms identified are Sabero Organics Chemical and the Sandhya Organics Chemical.
4. Chemical companies have announced price increases to their plastics and chemical products.
5. A chemical weapons attack has an analogy in a chemical spill –– remember that at least 15,000 people were killed by a chemical leak in Bhopal, India in 1'84.