Extra

Question 1

Organic synthesis

Answer 1

Process of making organic compounds from simpler starting materials

Question 2

Recrystallisation

Answer 2

Repeat crystallization in order to purify a solid

Question 3

Eutrophication

Answer 3

Enrichment of water with nutrients which leads to excessive growth of plants and algae. When algae die a heavy oxygen demand is placed on the water causing the dissolved oxygen level to drop and many animal life is killed

Question 4

How are heavy metals removed from water

Answer 4

Precipitation

Question 5

Formula of

Substance that causes temp hardness in water

Permanently in water

Answer 5

Calcium hydrogencarbonate
Ca(HCO3)2

Calcium Sulfate
CaSO4

Question 6

3rd treatment in sewage

Answer 6

Removal of phosphates and nitrates

Question 7

What is added to remove microbs from water

Answer 7

Chlorine

Question 8

Two methods of removing hardness in water

Answer 8

Distillation

Ion exchange resin

Question 9

What is BOD in water

Answer 9

Amount of oxygen dissolved

Consumed by biological action

When water is kept at 20c

In the dark

For 5days

Question 10

How is hardness removed

Answer 10

Through a mixed bed ion exchange resin