Difference between revisions of "Percentage Yield"

Latest revision as of 15:57, 17 December 2019

Key Stage 4

Meaning

The percentage yield is the mass of a product in an chemical reaction compared to the mass that could theoretically be produced in a perfect reaction as a percentage.

About Percentage Yield

The percentage yield is useful to work out the efficiency of a chemical reaction and considering the cost of forming the desired product.

Equation

Percentage Yield = (Actual mass of product / Theoretical maximum mass of product)x100%

Percentage Yield = \(\frac{M_A}{M_T}\times 100%\)

Where:

M_A = Actual mass of product

M_T = Theoretical maximum mass of product

Factors Affecting Percentage Yield

Reversible Reactions - Some reactions are reversible which means the products may react to form the original reactants resulting in less than 100% of the theoretical maximum mass of product.
Purity of Reactants - If the reactants are not pure then there is not as much of the original chemicals as was believed, resulting in less product being formed.
Collection of Product - Collecting and separating out the products may not be an easy process and some of the product may be lost in the process.
Unwanted Reactions - Sometimes there may be other chemical reactions which take place in the reaction mixture, this may reduce the amount of desired product.

References

@@ Line 1: / Line 1: @@
-==Key Stage 3==
+==Key Stage 4==
 ===Meaning===
-The '''percentage yield''' is the percentage of a [[product]] formed in a real [[Chemical Reaction|chemical reaction]] compared to the amount that would theoretically be produced in a perfect [[Chemical Reaction|reaction]].
+The '''percentage yield''' is the [[mass]] of a [[product]] in an [[Chemical Reaction|chemical reaction]] compared to the [[mass]] that could theoretically be produced in a perfect [[Chemical Reaction|reaction]] as a [[percentage]].
+===About Percentage Yield===
+: The '''percentage yield''' is useful to work out the efficiency of a [[Chemical Reaction|chemical reaction]] and considering the cost of forming the desired [[product]].
+===Equation===
+Percentage Yield = (Actual [[mass]] of [[product]] / Theoretical maximum [[mass]] of [[product]])x100%
+'' '''Percentage Yield''' '' = <math>\frac{M_A}{M_T}\times 100%</math>
+Where:
+: M<sub>A</sub> = Actual [[mass]] of [[product]]
+: M<sub>T</sub> = Theoretical maximum [[mass]] of [[product]]
+===Factors Affecting Percentage Yield===
+*[[Reversible Reaction]]s - Some [[Chemical Reaction|reaction]]s are [[Reversible Reaction|reversible]] which means the [[product]]s may [[Chemical Reaction|react]] to form the original [[reactant]]s resulting in less than 100% of the theoretical maximum [[mass]] of [[product]].
+*[[Pure|Purity]] of [[Reactant]]s - If the [[reactant]]s are not [[pure]] then there is not as much of the original [[chemical]]s as was believed, resulting in less [[product]] being formed.
+*Collection of [[Product]] - Collecting and separating out the [[product]]s may not be an easy process and some of the [[product]] may be lost in the process.
+*Unwanted [[Chemical Reaction|Reactions]] - Sometimes there may be other [[Chemical Reaction|chemical reaction]]s which take place in the [[Reaction Mixture|reaction mixture]], this may reduce the amount of desired [[product]].
+===References===
+====AQA====
+:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Percentage yield, page 78, GCSE Chemistry, Hodder, AQA '']
+:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Percentage yield, pages 68-69, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']
+:[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d203 ''Percentage yields, page 49, GCSE Chemistry; The Revision Guide, CGP, AQA '']
+:[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''Percentage yields, pages 141, 142, GCSE Chemistry, CGP, AQA '']
+====Edexcel====
+:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Percentage yield, page 108, GCSE Chemistry, Pearson, Edexcel '']
+:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Percentage yields, page 66, GCSE Chemistry; The Revision Guide, CGP, Edexcel '']
+:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Percentage yields, pages 189-191, GCSE Chemistry, CGP, Edexcel '']
+====OCR====
+:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Percentage yield, page 66, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR '']
+:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Percentage yield, pages 160-161, Gateway GCSE Chemistry, Oxford, OCR '']