chemical purity

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• chemical — 01. Many people worry about the effects of eating food which has been sprayed with [chemicals]. 02. Pollution in our environment is actually changing the [chemistry] of large bodies of water. 03. The fruit had been [chemically] treated to kill… …   Grammatical examples in English

• Chemical substance — Chemical redirects here. For other uses, see Chemical (disambiguation). Steam and liquid water are two different forms of the same chemical substance, water. In chemistry, a chemical substance is a form of matter that has constant chemical… …   Wikipedia

• Chemical weapon designation — Chemical, biological, and radiological warfare agents are sometimes assigned what is termed a military symbol. Military symbols evolved out of the First World War from the British in part for secrecy, and to simplify reference to chemicals by… …   Wikipedia

• Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of …   Wikipedia

• chemical industry — Introduction       complex of processes, operations, and organizations engaged in the manufacture of chemicals and their derivatives.       Although the chemical industry may be described simply as the industry that uses chemistry and… …   Universalium

• Chemical library — A chemical library or compound library is a collection of stored chemicals usually used ultimately in high throughput screening or industrial manufacture. The chemical library can consist in simple terms of a series of stored chemicals. Each… …   Wikipedia

• Chemical vapor deposition — DC plasma (violet) enhances the growth of carbon nanotubes in this laboratory scale PECVD apparatus. Chemical vapor deposition (CVD) is a chemical process used to produce high purity, high performance solid materials. The process is often used in …   Wikipedia

• Chemical tanker — The chemical tanker GINGA FALCON on the Columbia River showing a Independent one tank / one pump system …   Wikipedia

• chemical — adj. & n. adj. of, made by, or employing chemistry or chemicals. n. a substance obtained or used in chemistry. Phrases and idioms: chemical bond the force holding atoms together in a molecule or crystal. chemical engineer one engaged in chemical… …   Useful english dictionary

• purity rubric — noun : an authoritative statement (as in the United States Pharmacopoeia and the National Formulary) defining the purity of a drug or chemical for medicinal use …   Useful english dictionary

• chemical precipitation —       formation of a separable solid substance from a solution, either by converting the substance into an insoluble form or by changing the composition of the solvent to diminish the solubility of the substance in it. The distinction between… …   Universalium