SC2e - drinking water

Question 1

What percentage of the earth’s water is in the ocean?

Answer 1

97%

Question 2

What is desalination?

Answer 2

Producing pure water from seawater

Question 3

Why is water used form chemical analysis pure?

Answer 3

So there are no incorrect results

Question 4

Where does drinking water usually come from in the uk?

Answer 4

Rivers, lakes or aquifers and is then usually softened in reservoirs

Question 5

What does fresh water that comes from lakes, rivers and aquifers usually contain?

Answer 5

• Objects like leaves and twigs
• small insoluble particles like grit
• soluble substances like pesticides, salts and microorganisms that could be harmful to health

Question 6

How is desalination usually achieved?

Answer 6

Simple distillation

Question 7

What is step one of water purification?

Answer 7

Coarse filtration to get out large sediments in the water

Question 8

What is step two of water purification?

Answer 8

Sedimentation where dirt particles in water clump together and sink to the bottom

Question 9

What is step three of water purification?

Answer 9

Fine filtration where any remaining dirt particles get sprayed through a filter of sand and gravel

Question 10

What is step four of water purification?

Answer 10

Chlorination which is when a small amount of chlorine gets put through the water to kill any bacteria and microbes