C4 - Calculations

Question 1

What is a mole?

Answer 1

mass of substance that contains 6.02 x10^23

Question 2

Avogrado’s constant

Answer 2

6.02 x10^23

Question 3

What is a limiting reactant?

Answer 3

the reactant that is completely used up in a chemical reaction

Question 4

How do you convert cm3 to dm3

Answer 4

divide by 1000

Question 5

What is the yield of a reaction?

Answer 5

mass of product obtained from reaction

Question 6

What is theoretical yield of reaction?

Answer 6

maximum mass of a product that could have been produced

Question 7

Why is actual yield always less than theoretical yield?

Answer 7

• reaction may be reversible
• some of the product can be lost in separation
• unexpected side reactions can occur between reactants

Question 8

What is atom economy?

Answer 8

measure of how many atoms of the reactants end up as useful products

Question 9

Why do you want high atom economy?

Answer 9

results in less waste/ is more sustainable

Question 10

What is a titration?

Answer 10

method is used to calculate the concentration of an unknown solution

Question 11

What is the end point?

Answer 11

the point at which the reaction is complete - when the indicator colour changes - and no substances are in excess

Question 12

What is a titre?

Answer 12

volume of solution added from burette