CFCs Flashcards
1
Q
What do CFCs do
A
Break down ozone in the atmosphere 03
2
Q
What are CFCs
A
Molecules that have had all their hydrogens replaced by chlorine and fluorine
3
Q
Are CFCs stable
A
Are stable molecules but broken down by UV
4
Q
What is broken by the UV lights
A
C-CL bonds
Radicals are formed which catalyse the breakdown of ozone
5
Q
Why is the C-CL bond broken by the UV light
A
Have the lowest bond enthalpy
6
Q
What are CFCs used for
A
refrigerants, aerosol propellants
7
Q
How is nitrogen oxide formed
A
vehicle emissions (aircraft) and thunderstorms
8
Q
Benefits of CFCs
A
Stable
Non-toxic
9
Q
What temporary alternatives do we use for CFCs
A
Hydrocarbons
HFCs - hydrofuoro carbon
As both don’t have chlorine
10
Q
What do we now use in propellents
A
pump sprays and unreactive gases
11
Q
What is now used for the refrigerant
A
ammonia
