Precentage Yield And Am Economy

Question 1

What does 100% yield mean?

Answer 1

Means that no product has been lost

Question 2

What does 0% yield mean?

Answer 2

Means that no product has been made

Question 3

Recognise possible reasons why the percentage yield of a product is less than 100%

Answer 3

Loss in filtration
Loss in evaporation
Loss in transferring liquids
Not all reactants react to make product

Question 4

What is atom economy?

Answer 4

A way of measuring the amount of atoms that are wasted when manufacturing a chemical

Question 5

What does 100% atom economy mean?

Answer 5

Means that all atoms in the reactant have been converted to the desired product

Question 6

What does it mean if you have a high atom economy?

Answer 6

It means that the more ‘greener’ the process is

Question 7

Equation for percentage yield

Answer 7

Percentage yield = actual yield / percentage yield X100

Question 8

Explain why an individual process wants as high as percentage yield as possible?

Answer 8

• reducing the reactants wasted

- reducing cost

Question 9

Explain why an industrial process wants as high an atom economy as possible

Answer 9

To reduce the production of unwanted products

To make the process more sustainable

Question 10

Equation for atom economy

Answer 10

Atom economy = Mr of desired products / sum of Mr of all products X100

Question 11

What is percentage yield?

Answer 11

A way of comparing amount of product made (actual yield) to amount expected (predicted yield)