13.5 - Ozone depletion

Question 1

Why are HFCs used instead of CFCs?

Answer 1

As these compounds don’t contain any chlorine atoms, they will not have adverse effects on theozone layer

Question 2

Effects of CFCs on the ozone layer

Answer 2

Thoughchlorofluorocarbons(CFCs) have many beneficial uses, they also have devastating effects on the ozone layer:

• CFCs absorb a lot of UV radiation in the upper atmosphere
• The CFCs are then broken down by the UV light causing the formation of chlorine radicals
• These radicals react with ozone and break down the ozone layer

Question 3

Why is the ozone layer important?

Answer 3

The ozone layer is beneficial for life on Earth because it absorbs most of the sun’s harmful ultraviolet radiation

• Ultraviolet radiation is linked to skin cancer, damaging DNA and harming marine life

Question 4

Why are CFCs good?

Answer 4

• inert
• non flammable
• non-toxic

Question 5

Uses of CFCs

Answer 5

solvents for dry cleaning
refrigerants
aerosol propellants