Ozone Depletion

What are the most common halogenoalkanes

Chloroflurorcarbons

What is their uses

• refrigerators

• propellants for aerosols

• solvents for dry cleaning

Why do they have many uses

They have chemical inertness since they are non-flammable and non-toxic

What is ozone

A substance present in the ozone layer

What is the chemical formulae of ozone

O₃

What are the uses of ozone

Absorbs UV radiation, stopping it from reaching us

What are the negative effects of UV

can cause sunburn or skin cancer

How is ozone naturally formed

O₂ is broken down into two free radical by UV radiation, which attacks other oxygen molecules, forming ozone

What do CFCs form that harm the ozone layer

They create chlorine free radicals when the C-Cl bonds is broken down by UV radiation

What can this product do to harm ozone

They react with ozone to form intermediate chlorine oxide free radical and an oxygen molecule

What are hydrofluorocarbons

Compounds that contain carbon attached to hydrogen and fluroine atoms only

Why are HFCs a safer alternative to CFCs

HFCs don’t contain chlorine