Chemistry C6 - depletion of the ozone layer

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Name the light that comes from the sun and is dangerous to living things but absorbed by the ozone layer
Ultravoilet light
1 of 15
What could happen if we didn't have an atmosphere that could absorb this radiation?
It woul expose the earth to damaging rays and radiation
2 of 15
Describe how oxygen came to be present in our atmosphere
Primitive organisms evolved and produced oxygen when they photosynthesised
3 of 15
Give two words that describe the properties of CFC's that means they will not easily decompose
Chemicaly inert, insolulable in water
4 of 15
Give two words that describe the properties of CFC's that means they will not get washed out in rain water
Insolulable in water, easily liquified by water
5 of 15
About how high above the earth is the stratoshpere? (In KM)
Between 17-50 KM
6 of 15
What chemical in the stratosphere is destroyed because it begins to react with CFC's?
Ultravoilet light
7 of 15
What can happen to the covalent bond between th carbo atom and the chlorine atom if the CFC molecule is exposed to ultravoilet light in the stratosphere?
The molecule can split
8 of 15
What two types of particle are formed if the bond splits unevenly?
Positive and negative ions
9 of 15
What particles are formed if the bond splits evenly?
Free radicals with an unpaired electron
10 of 15
Explain why only a small number of chlorine radicals can set up lots of chain reactions
Because they combie to create new radicals
11 of 15
What is the effect caused by the formation of chlorine atoms in the stratosphere?
The depletion of the ozone layer
12 of 15
For a chain reaction to end, what are the two types of particle that must bump into eachother?
Two free radicals
13 of 15
When the discovery of the damaging effects CFC's caused to the ozone layer, how did the attitude of scienctists change?
They thought that CFC's should be banned, and an alternative be found.
14 of 15
Why will the damage to the ozone layer be repaired very slowly?
Because the CFC'S remain in the atmosphere for a long time
15 of 15

Other cards in this set

Card 2

Front

What could happen if we didn't have an atmosphere that could absorb this radiation?

Back

It woul expose the earth to damaging rays and radiation

Card 3

Front

Describe how oxygen came to be present in our atmosphere

Back

Preview of the front of card 3

Card 4

Front

Give two words that describe the properties of CFC's that means they will not easily decompose

Back

Preview of the front of card 4

Card 5

Front

Give two words that describe the properties of CFC's that means they will not get washed out in rain water

Back

Preview of the front of card 5
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