A Levels AS Chemistry (Unit 2 - module 1 basic concepts and hydrocarbons) Flashcards on Atom Economy and Percentage Yield, created by liblob12 on 14/04/2014.
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Created by liblob12
over 10 years ago
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Created by liblob12
over 10 years ago
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What is theoretical yield?
How do you calculate theoretical yield?
What is actual yield?
Give a couple of ways chemicals can get 'lost'..
What is percentage yield?
What is the formula for percentage yield?
Solve: Ethanol can be oxidised to form ethanal: C2H5OH +[O] --> CH3CHO + H2O 9.2g of ethanol was reacted with an oxidising agent in excess and 2.1g of ethanal was produced. Calculate the theoretical yield and the percentage yield?
What is atom economy?
What is the formula for atom economy?
What is the atom economy for addition reactions?
What is the atom economy for substitution reactions?
Solve: The reaction of bromomethane (CH3Br) with sodium hydroxide (NaOH) to make methanol (CH3OH): CH3Br + NaOH --> CH3OH +NaBr
Solve: 0.475g of CH3Br reacts with an excess of NaOH in this reaction: CH3Br + NaOH --> CH3OH + NaBr
0.153g of CH3OH is produced. What is the percentage yield?
Can reactions have high percentage yields and low atom economies?
Why do companies always choose to use reactions with high atom economies?
