Reacting quantities.

Question 1

Percentage yield formula.

Answer 1

actual yield/theoretical yield x 100.

Question 2

Reasons for lower percentage yield.

Answer 2

-Reaction may not have gone to completion
-other/side reactions may have taken place alongside the main reaction
-Purification of product may result in loss of product(on containers/open container).

Question 3

Limiting reagent definition.

Answer 3

The reactant that is not in excess and will be completely used up first-stopping the reaction.
Calculations are always based on the limiting reagent.

Question 4

Atom economy calculation.

Answer 4

sum of molar masses of desired products/sum of molar masses of all products x 100.

Question 5

Benefits of processes w/ high atom economies.

Answer 5

Make best use of natural resources
Reduce harmful waste
More efficient processes
Preserves finite raw materials

Question 6

How to improve atom economy.

Answer 6

Finding a use for the other product made in the reaction.

Question 7

Percentage uncertainty calculation.

Answer 7

Uncertainty/measured value x 100.