Answer part A or part B - Leaving Cert Chemistry - Question c - 2015
Question c
Answer part A or part B.
A
(i) Oxygen gas (O₂) is produced industrially by liquefaction and fractional distillation of air. What other gas is the major product of ... show full transcript
Worked Solution & Example Answer:Answer part A or part B - Leaving Cert Chemistry - Question c - 2015
Step 1
What other gas is the major product of this process?
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Answer
The major product of the liquefaction and fractional distillation of air is nitrogen (N₂).
Step 2
What is the approximate percentage of this second gas in the atmosphere?
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Answer
Nitrogen makes up approximately 78% of the atmosphere.
Step 3
Give a widespread use for this second gas.
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Answer
Nitrogen is widely used in the packaging of food, medical uses to freeze tissue, and in flushing tanks.
Step 4
Name the other form of oxygen gas (O₃) formed in the stratosphere.
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Answer
The other form of oxygen gas formed in the stratosphere is ozone (O₃).
Step 5
What environmentally beneficial effect does O₃ have?
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Answer
Ozone (O₃) blocks harmful UV rays from the sun and helps remove chlorine atoms (radicals, Cl) from the atmosphere, which protects against skin cancer and prevents cataracts.
Step 6
Identify a group of chemicals that damages O₃.
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Answer
Chlorofluorocarbons (CFCs) are a group of chemicals that damage ozone (O₃).
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