C3c

Question 1

How is a high atom economy good for profits?

Answer 1

-decreasing amount of reactants wasted, so money is saved

Question 2

How is a high atom economy good for the environment?

Answer 2

-saves resources as resources are not wasted, and stops reactions from being unsustainable

Question 3

What is percentage yield?

Answer 3

• comparison of actual yield and predicted yield
• evaporation
• filtraton
• transferring liquids
• not all reactants react to make product

Question 4

What is atom economy?

Answer 4

-tells you how much mass of reactants was wasted

Question 5

Why a yields never 100%?

Answer 5

-some product or reactant always lost along the way

Question 6

How does transferring liquids cause a loss of yield?

Answer 6

• may lose some liquid when transferring from one container to the next, even if nothing spills
• some always gets left behind on inside surface of last container

Question 7

What are the benefits of a high percentage yield?

Answer 7

• reduce waste products

- reduce costs

Question 8

How does filtration reduce percentage yield?

Answer 8

• filtering liquid to remove solid particles you always lose a bit of liquid or solid
• if you want to keep liquid, you lose the bi that remains with the solid and filter paper
• if you want to keep solid, some of it always gets left behind when you scrape it off filter paper

Question 9

How does evaporation reduce percentage yield?

Answer 9

• liquids evaporate all the time

- even more when heated

Question 10

How do not all reactants reacting reduce percentage yield?

Answer 10

-reversible reactions turn products back to reactants while the reaction is going on, so yield will never be 100%