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Enantiomeric excess
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- Enantiomeric excess is defined as the absolute difference between the mole fraction of each enantiomer: where In practice, it is most often expressed as a percent enantiomeric excess.
en.wikipedia.org/wiki/Enantiomeric_excess
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In stereochemistry, enantiomeric excess ( ee) is a measurement of purity used for chiral substances. It reflects the degree to which a sample contains one enantiomer in greater amounts than the other. A racemic mixture has an ee of 0%, while a single completely pure enantiomer has an ee of 100%.
Aug 30, 2014 · Left gloves and right gloves are mirror images of each other, but they can’t be superimposed. In chemistry, there’s a word we have to describe a pair of non-superimposable mirror images – they’re called enantiomers. Tying it back to the drawings, we can have three types of situations.
Chemistry ER abbreviation meaning defined here. What does ER stand for in Chemistry? Get the most popular ER abbreviation related to Chemistry.
Jul 3, 2017 · Look up definitions of chemistry words in this comprehensive A to Z chemistry dictionary. The glossary is organized alphabetically.
Activation Energy. Activation energy is the minimum energy required for a reaction to take place between two colliding reactant particles. Enthalpy changes are shown on an enthalpy profile diagram. Activation energy is the difference between the reactants and the top of the hump on an enthalpy profile diagram and is represented by the symbol Ea.
Atoms are held together by a certain amount of energy called bond energy. Energy is required to break bonds. Energy is released when chemical bonds are formed because atoms become more stable. Chemical processes are labeled as exothermic or endothermic based on whether they give off or absorb energy, respectively.
Erbium, chemical element, a rare-earth metal of the lanthanide series of the periodic table. Pure erbium is a silvery white metal. The major use of erbium is in fiber-optic telecommunications as a component of signal amplifiers in long-distance telephone and data cables.
