3.3 Haloalkanes

Question 1

How is the ozone formed?

Answer 1

O2 –UV–> 2O⚫️

O2 + O⚫️ -> O3 Ozone

Question 2

How do CFCs break this down?

Answer 2

When used and released in the atmosphere CFCs catalyse the break down of O3

CCl3F –UV–> ⚫️CCl2F + Cl⚫️
Cl⚫️ + O3 -> ClO⚫️ + O2
ClO⚫️ + O3 -> 2O2 + Cl⚫️

So in total, it catalyses:
2O3 -> 3O2

Question 3

What are CFCs?

Answer 3

ChloroFluroCarbons were useful as non toxic non flammable chemicals used in fire extinguishers, propellants and coolants.

Question 4

What was the issue with CFCs?

Answer 4

In 1970 they were banned as they were breaking down the ozone after investigations and scientific research. They are now replaced with HCFCs and HFCs as temporary less damaging replacements.

Question 5

What is a nucleophile?

Answer 5

An electron pair donator

Question 6

What is the ozone layer?

Answer 6

A chemical layer which can absorb UV Rays.