10.1 Water & Water Pollution

Question 1

What is the test for water?

Answer 1

Anhydrous cobalt(II) chloride or
Anhydrous copper(II) sulfate

Question 2

Colour of Anhydrous cobalt(II) chloride?

Answer 2

Blue

Question 3

Colour of Anhydrous copper(II) sulfate?

Answer 3

White

Question 4

Colour of Hydrated cobalt(II) chloride?

Answer 4

Pink

Question 5

Colour of Hydrated copper(II) sulfate?

Answer 5

Blue

Question 6

Test for water purity?

Answer 6

Check melting and boiling points

Question 7

What happens to m.p when impurities are present?

Answer 7

Decrease in m.p

Question 8

What happens to b.p when impurities are present?

Answer 8

Increase in b.p

Question 9

Define an aquifer

Answer 9

A rock that stores water

Question 10

List 3 substances found in natural water

Answer 10

• Metal Ions
• Sewage
• Dissolved Oxygen

Question 11

List the 3 steps of water treatment in order

Answer 11

Sedimentation
↓
Filtration (Carbon Treatment)
↓
Chlorination

Question 12

What does NPK stand for in NPK fertilizers?

Answer 12

Nitrogen
Phosphorus
Potassium

Question 13

Which of the elements in NPK promotes healthy leaves?

Answer 13

Nitrogen

Question 14

Which of the elements in NPK promotes growth/fruit/flowers?

Answer 14

Potassium

Question 15

Which of the elements in NPK promotes healthy roots?

Answer 15

Phosphorus

Question 16

Name all 3 salts that could be in NPK fertilisers

Answer 16

Ammonium nitrate

Ammonium Phosphate

Potassium Nitrate