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what is the unit of purity of a chemical sustance?
If you are referring to chemical purity by grade, I suggest you research the following terms: ACS Grade (American Chemical Society) - highest level of purity Reagent grade - Almost as stringent as ACS USP Grade - Equivalent to ACS for many drugs NF Grade (National Formulary) - Equivalent to ACS for many drugs Laboratory Grade Purified Grade Technical Grade
When was Yizeng Chemical Fibre created?
Yizeng Chemical Fibre was created in 1993.
What is Bromothymol Blue Reagent Grade?
Bromothymol blue is a dye that is used primarily an acid-base indicator (see http://en.wikipedia.org/wiki/Bromothymol_blue) in laboratory and industrial chemistry.The designation "Reagent" indicates that a chemical substance conforms to a high standard of purity, which standard is set forth either by government or by a professional chemical society, such as the American Chemical Society (ACS). Without knowing which standard the "reagent" chemical adheres to, it is necessary to have what is called a "guaranteed analysis", which is usually printed on the bottle label. Otherwise the term "reagent" is unimportant, and the chemist should assume that the chemical is "reasonably pure for preparative purposes" which is the orignal meaning of "technical grade".Working chemists in the United States will prefer to use chemicals designated "ACS" or "ACS Reagent" when performing research procedures that may be, or must be, reproduced in exacting detail by others. Use of such standardized chemicals makes the task of re-creating the original reaction conditions much easier. The designation "ACS" has effectively replaced the term "Reagent" in modern chemical production in the United States. ACS does NOT necessarily mean the purest available in commerce; it simply means very pure, and adhering to a standard. Purer grades than ACS include "CP", which is the purest obtainable by commercial procedures, Chromatography Grade, and others.
When was Chemical Abstracts Service created?
Chemical Abstracts Service (CAS) was created in 1907 by the American Chemical Society. It is a division of the American Chemical Society providing chemical information and databases to researchers in various fields.
When was The Journal of Chemical Thermodynamics created?
The Journal of Chemical Thermodynamics was created in 1969.
When was ACS Chemical Biology created?
ACS Chemical Biology was created in 2006.
When was Journal of Neuroscience created?
Journal of Neuroscience was created in 1981.
When was Neuroscience Letters created?
Neuroscience Letters was created in 1975.
When was UCL Neuroscience created?
UCL Neuroscience was created in 2008.
When was Nature Neuroscience created?
Nature Neuroscience was created in 1998.
When was ACS Recaş created?
ACS Recaş was created in 1917.
When was ACS Nano created?
ACS Nano was created in 2007.
When was Journal of Integrative Neuroscience created?
Journal of Integrative Neuroscience was created in 2002.
When was Nature Reviews Neuroscience created?
Nature Reviews Neuroscience was created in 2000.
When was Gruber Prize in Neuroscience created?
Gruber Prize in Neuroscience was created in 2000.
When was Journal of Neuroscience Research created?
Journal of Neuroscience Research was created in 1975.
When was European Journal of Neuroscience created?
European Journal of Neuroscience was created in 1989.
