Using Resources

Question 1

What is the purpose of a life cycle assessment (LCA)?

Answer 1

To assess the environmental impact of products

Question 2

What the correct order for the stages of a life cycle assessment?

Answer 2

1) Extracting and processing the raw materials

2) Manufacturing and packaging the product

3) Using the product

4) Disposing of the product

Question 3

What are the disadvantages of Extracting and processing the raw materials

Answer 3

Cutting down trees

Digging of mines

Carbon dioxide production from energy use

Release of pollutants into the environment

Question 4

What 3 things make water potable

Answer 4

Levels of dissolved substances like salt must be low

The pH must be between 6.5 and 8.5

There must be no microorganisms

Question 5

What are the 3 stages of treating fresh water

Answer 5

1) pass the water through a wire mesh. This will filter out any large objects like plastic bottles or leaves.

2) pass the water through a bed of sand and gravel. This will filter out smaller things like bits of rock.

3) sterilise the water to kill any microorganisms.
Bubbling chlorine gas through it, Exposing it to ozone, or by exposing it to ultraviolet radiation.