Write balanced chemical equations showing
(i) the formation of ozone in the stratosphere,
(ii) the photodissociation of ozone - Leaving Cert Chemistry - Question B - 2009
Question B
Write balanced chemical equations showing
(i) the formation of ozone in the stratosphere,
(ii) the photodissociation of ozone.
CFCs are a group of substances known ... show full transcript
Worked Solution & Example Answer:Write balanced chemical equations showing
(i) the formation of ozone in the stratosphere,
(ii) the photodissociation of ozone - Leaving Cert Chemistry - Question B - 2009
Step 1
the formation of ozone in the stratosphere
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Answer
The formation of ozone (O₃) in the stratosphere can be represented by the following balanced chemical equation:
3extO2+extUVlightightarrow2extO3
This shows that diatomic oxygen (O₂) molecules can absorb ultraviolet (UV) light, leading to the formation of ozone (O₃).
Step 2
the photodissociation of ozone
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Answer
The photodissociation of ozone can be expressed through the following balanced equation:
extO3+extUVlightightarrowextO2+extO∗
In this process, ozone absorbs UV radiation, resulting in its breakdown into molecular oxygen (O₂) and a highly reactive oxygen atom (O).
Step 3
State two effects of damage to the ozone layer
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Increased exposure to ultra-violet (UV) radiation leading to higher rates of skin cancer and other health issues in humans.
Damage to ecosystems, particularly affecting plant growth and aquatic life due to the harmful effects of UV radiation.
Step 4
Give one former major use of CFCs
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Answer
One major former use of chlorofluorocarbons (CFCs) was in refrigeration systems and air conditioning, where they acted as refrigerants.
Step 5
Give an example of a CFC
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An example of a CFC is dichlorofluoromethane, commonly known as CFC-12.
Step 6
Identify the group of compounds now used as ozone friendly CFC replacements
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Answer
Hydrochlorofluorocarbons (HCFCs) are now used as replacements for CFCs. They contain hydrogen, which makes them less harmful to the ozone layer compared to traditional CFCs.
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