E4 Ozone Depletion

this image shows the rays being sent onto the ozone layer and shows the depletion of the ozone layer.

this image shows the cycle of the ozone depletion and how its shown to be depleted.

this shows the rays being sent off to different sides and how the ozone depletion is transferred off.

review questions;

(c) discuss the advantages and disadvantages of using hydrocarbon in place of CFC’s. [2]

The advantage is that the bond between C-Cl is not weak, it does not release Cl atoms.

The disadvantage is that, it has the ability to absorb infrared radiation, increased greenhouse effect, and causes global warming.

(a) write equations for the natural formation of ozone. [2]

O+O2 – O3

Chlorofluorocarbons, CFC’s, deplete the ozone layer.

(a) State the equations that represent the depletion of ozone in the stratosphere which is catalysed by chlorine free radicals. [2]

O + O3 → 2 O2

(b) Chlorine atoms and nitrogen oxides react at the surface of ice particles in the arctic winter.

(i) Deduce the type of catalysis that occurs. [1]

ice 

(ii) Outline why the depletion of ozone is greatest during the arctic spring. [2]

The arctic spring has the greatest ozone depletion during this time of the year because the arctic ozone has a hole in an area of the stratosphere and that has brought its level to as low as 33%. 

Chlorofluorocarbons, CFC’s, deplete the ozone layer.

Freon 

(a) State the name of one source of CFC’s. [1]

Air conditioner

(b) In terms of their properties, suggest two reasons why CFC’s continue to be used widely. [2]

Because it can be made into room temperature, there is less toxicity and flammability.

(c) State one advantage and one disadvantage of using tetrafluoromethane as an alternative to CFC’s. [2]

The advantage is that it is stable, and there is no ozone depletion.

The disadvantage is that it still has an effect on the greenhouse gas causing global warming.

Advertisements
This entry was posted in E4 Ozone Depletion. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s