Difference between revisions of "Percentage Yield"
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*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. | *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]]. | *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]]. | ||
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| + | ===References=== | ||
| + | ====AQA==== | ||
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| + | :[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 ''] | ||
Revision as of 17:12, 10 November 2019
Contents
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:
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.