C3

Question 0

What is the Relative Formula Mass Mr?

Answer 0

• The relative formula mass is (Mr) of a compound is the sum of the relative atomic masses of all the atoms present in the formula.
• For example, calculate the relative formula mass of H2SO4
H = 1 2 x 1 = 2
S = 32 1 x 32 = 32
O = 16 4 x 16 = 64
Mr = 98

Question 1

What is the Relative Atomic Mass Ar?

Answer 1

• Each element has two numbers, the larger of the two is Ar.

* For example, the relative atomic mass if carbon is 12

Question 2

Name three ways materials can be extracted from plant materials to make medicines?

Answer 2

1. Crushing - using a pestle and mortar
2. Boiling & Dissolving - using a suitable solvent
3. Chromatography - using chromatography to separate a concentrated solution

Question 3

What factors affect the cost of medication?

Answer 3

• Materials - synthetic or natural
• Research & Testing - which can take years
• Labour - high quality staff are needed, cannot be made on machines as only a small quantity is needed
• Energy
• Marketing

Question 4

Describe the batch process.

Answer 4

• Reactants are put in a reactor and the product is removed at the end of the reaction
• Product made on demand - small amount
• Used to make variety of products
• Labour intensive

Question 5

Describe the continuous process.

Answer 5

• Reactants are continually fed into the reactor as the products are removed
• The production of ammonia in the Haber process and sulfuric acid in the Contact process are made in this way.
• Makes product on a large scale
• Are dedicated to making just one product
• Operate all the time
• Can run automatically