Small-world network - Revision history

en>Wavelength: correcting 1 dangling modifier: "That said" —> "However"—http://grammar.ccc.commnet.edu/grammar/modifiers.htm

2014-12-15T03:06:39Z

correcting 1 dangling modifier: "That said" —> "However"—http://grammar.ccc.commnet.edu/grammar/modifiers.htm

en>Schulllz at 13:06, 24 February 2014

2014-02-24T13:06:08Z

← Older revision		Revision as of 15:06, 24 February 2014
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	~~In [[chemistry]], '''yield''', also referred to~~ as ~~a '''reaction yield''', is the [[amount of substance\|amount]] of [[Product (chemistry)\|product]] obtained in a [[chemical reaction]]~~.~~<ref name=vogel>Vogel, A.I., Tatchell, A.R., Furnis, B.S., Hannaford, A.J. and P.W.G. Smith. ''Vogel's Textbook~~ of ~~Practical Organic Chemistry, 5th Edition''~~. ~~Prentice Hall, 1996. ISBN 0582462363.</ref> The ''~~'~~absolute yield''' can be given as the weight in [[gram]]~~s or in ~~[[Mole (unit)\|moles]] ('''molar yield''')~~. ~~The '''fractional yield''', '''relative yield''', or '''percentage yield''', which serve to measure the effectiveness of~~ a ~~[[Chemical synthesis\|synthetic procedure]], are calculated by dividing the amount of the obtained product by the~~ '~~''theoretical yield''' (the unit of measure for both must be the same):~~		The writer is known as Irwin. One of the issues he enjoys most is ice skating but he is struggling to find time for it. For years he's been residing in North Dakota and his family loves it. In her professional lifestyle she is a payroll clerk but she's always wanted her personal business.<br><br>Look at my weblog [http://limmuseum.com/?document_srl=312447 over the counter std test]

	<~~center~~><~~math~~>~~\mbox{fractional yield} = \frac{\mbox{actual yield}}{\mbox{theoretical yield}}<~~/~~math><~~/~~center>~~

	~~One or more reactants in a chemical reaction are often used in excess~~. The theoretical yield is something used in chemistry. Stochiometry is a branch of chemistry that deals with relative quantities of reactants and products in a chemical reaction. The theoretical yield is therefore calculated based on the molar amount of the [[limiting reactant]], taking into account the [[stoichiometry]] of the reaction. For the calculation it is usually assumed that there is only one reaction involved.

	The ideal or ''theoretical yield'' of a chemical reaction would be 100%, a value that is impossible to achieve due to limitations in measurement accuracy. According to Vogel's Textbook of Practical Organic Chemistry, yields around 100% are called ''quantitative'', yields above 90% are called ''excellent'', yields above 80% are ''very good'', yields above 70% are ''good'', yields above 50% are ''fair'', and yields below 40% are called ''poor''.<ref name=vogel /> It should however be noted that these names are arbitrary and not universally accepted, and for many reactions these expectations may be unrealistically high. Yields may appear to be above 100% when products are impure, as the measured weight of the product will include the weight of any impurities. Purification steps always lower the yield and the reported yields usually refer to the yield of the ~~final purified product.~~

	~~==See also==~~
	*[[Quantum yield]]

	~~==References==~~
	~~{{reflist}}~~

	~~[[Category:Stoichiometry]~~]

	~~{{chem-stub}}~~

en>Monkbot: Fix CS1 deprecated date parameter errors

2014-01-30T03:52:01Z

Fix CS1 deprecated date parameter errors

← Older revision		Revision as of 05:52, 30 January 2014
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	~~I would like~~ to ~~introduce myself to you~~, ~~I am Jayson Simcox but I don't like when individuals use my full~~ name. ~~To play domino is something~~ I ~~truly enjoy doing~~. ~~Since he was eighteen he~~'s ~~been operating~~ as ~~an info officer but he plans on altering it. Mississippi is where his home is~~.<br><br>~~my site; [http:~~//~~juego~~.~~red~~/~~groups/apply-~~the~~-following-tips-when-gardening-~~and-~~grow/ real psychic]~~		In [[chemistry]], '''yield''', also referred to as a '''reaction yield''', is the [[amount of substance\|amount]] of [[Product (chemistry)\|product]] obtained in a [[chemical reaction]].<ref name=vogel>Vogel, A.I., Tatchell, A.R., Furnis, B.S., Hannaford, A.J. and P.W.G. Smith. ''Vogel's Textbook of Practical Organic Chemistry, 5th Edition''. Prentice Hall, 1996. ISBN 0582462363.</ref> The '''absolute yield''' can be given as the weight in [[gram]]s or in [[Mole (unit)\|moles]] ('''molar yield'''). The '''fractional yield''', '''relative yield''', or '''percentage yield''', which serve to measure the effectiveness of a [[Chemical synthesis\|synthetic procedure]], are calculated by dividing the amount of the obtained product by the '''theoretical yield''' (the unit of measure for both must be the same):

			<center><math>\mbox{fractional yield} = \frac{\mbox{actual yield}}{\mbox{theoretical yield}}</math></center>

			One or more reactants in a chemical reaction are often used in excess. The theoretical yield is something used in chemistry. Stochiometry is a branch of chemistry that deals with relative quantities of reactants and products in a chemical reaction. The theoretical yield is therefore calculated based on the molar amount of the [[limiting reactant]], taking into account the [[stoichiometry]] of the reaction. For the calculation it is usually assumed that there is only one reaction involved.

			The ideal or ''theoretical yield'' of a chemical reaction would be 100%, a value that is impossible to achieve due to limitations in measurement accuracy. According to Vogel's Textbook of Practical Organic Chemistry, yields around 100% are called ''quantitative'', yields above 90% are called ''excellent'', yields above 80% are ''very good'', yields above 70% are ''good'', yields above 50% are ''fair'', and yields below 40% are called ''poor''.<ref name=vogel /> It should however be noted that these names are arbitrary and not universally accepted, and for many reactions these expectations may be unrealistically high. Yields may appear to be above 100% when products are impure, as the measured weight of the product will include the weight of any impurities. Purification steps always lower the yield and the reported yields usually refer to the yield of the final purified product.

			==See also==
			*[[Quantum yield]]

			==References==
			{{reflist}}

			[[Category:Stoichiometry]]

			{{chem-stub}}

134.76.222.216: improved layout of math formula

2012-08-13T08:42:01Z

improved layout of math formula

New page

I would like to introduce myself to you, I am Jayson Simcox but I don't like when individuals use my full name. To play domino is something I truly enjoy doing. Since he was eighteen he's been operating as an info officer but he plans on altering it. Mississippi is where his home is.<br><br>my site; [http://juego.red/groups/apply-the-following-tips-when-gardening-and-grow/ real psychic]