Percentage Yield

Question 1

what are the four factors that make sure the percentage yield is always below 100%

Answer 1

1) Incomplete reactions
2) extraction
3) side reactions
4) waste

Question 2

when can an incomplete reaction occur

Answer 2

1) the reaction is very slow and hasn’t been given enough time to happen
2) the reaction is reversible and some of the products have turned back into reactants

Question 3

what is the issue with extraction

Answer 3

with extraction it might be difficult to fully separate the product from the reaction mixture

Question 4

what is a side reaction

Answer 4

unexpected reactions may occur, this may mean that the intended product is not created

Question 5

what is the issue with waste

Answer 5

some of the products may stick to the apparatus

Question 6

what is the formula for percentage yield

Answer 6

percentage yield = real yield / theoretical ( x 100 )

Question 7

what is the real yield

Answer 7

the real yield is the mass of a desired product obtained from a reaction

Question 8

what is the theoretical yield

Answer 8

maximum mass of a product that could possibly be made from a reaction

Question 9

what is the percentage yield

Answer 9

a comparison of the real and theoretical yield of a reaction