6. Compounds A, B, C and D in the table are found in fuels:
(a) Name compounds A and B - Leaving Cert Chemistry - Question 6 - 2014
Question 6
6. Compounds A, B, C and D in the table are found in fuels:
(a) Name compounds A and B.
(b) Compound A is a greenhouse gas.
Name a source that releases A into the ... show full transcript
Worked Solution & Example Answer:6. Compounds A, B, C and D in the table are found in fuels:
(a) Name compounds A and B - Leaving Cert Chemistry - Question 6 - 2014
Step 1
Name compounds A and B.
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Answer
Compound A is methane and compound B is butane.
Step 2
Name a source that releases A into the atmosphere.
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Answer
A source that releases methane into the atmosphere is decomposition of animal waste or decomposition of plants.
Step 3
Copy the equation into your answer book and balance it.
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Answer
The balanced equation is:
ightarrow CO_2 + 2H_2O $$
Step 4
What do the letters LPG stand for?
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LPG stands for liquefied petroleum gas.
Step 5
Name another substance found in LPG.
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Answer
Another substance found in LPG is propane or 2-methylpropane (isobutane).
Step 6
What is meant by the octane number of a fuel?
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Answer
The octane number of a fuel is a measure of the fuel's ability to resist auto-ignition (knocking or pinging) during combustion.
Step 7
Would you expect compound C or compound D to have the higher octane number? Give a reason for your answer.
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Answer
I would expect compound D to have the higher octane number because it has a shorter chain and is branched, which helps to prevent knocking.
Step 8
Why were lead compounds added to motor fuel in the past?
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Answer
Lead compounds were added to motor fuel in the past to improve the octane rating of the fuel and to prevent engine knocking.
Step 9
Why was the addition of lead compounds to motor fuel discontinued?
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The addition of lead compounds was discontinued because they were found to be toxic and damaging to catalytic converters and the environment.
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