chemistry

Question 1

Explain how potable water is produced from fresh water?

Answer 1

Chose appropriate water source such as lakes or rivers or streams
Pass through filter beds to remove undissolved solids
Sterilize using chlorine or ozone or UV light which destroys harmful microbes

Question 2

Suggest a way that countries can get water if they have very little rainfall?

Answer 2

Desalination
Reverse osmosis
Distillation

Question 3

Name two naturally occurring polymers produced from glucose

Answer 3

Starch, cellulose

Question 4

Name structure of DNA?

Answer 4

Two polymer chains, four different nucleotides, double helix structure

Question 5

What is the Haber process?

Answer 5

Used to manufacture nitrogen which is used to produce nitrogen based fertilizers

Question 6

Where is the Nitrogen and hydrogen obtained from?

Answer 6

Nitrogen is obtained from the air and hydrogen is obtained from natural sources

Question 7

What are the conditions for the Haber process?

Answer 7

450 degrees
pressure : 200 atmosphere
passed over catalyst of iron