6. Hydrogen gas and the hydrocarbons ethyne and butane are all used as fuels - Leaving Cert Chemistry - Question 6 - 2008
Question 6
6. Hydrogen gas and the hydrocarbons ethyne and butane are all used as fuels.
(a) What are (i) hydrocarbons, (ii) fuels? (8)
(b) (i) Which of the three fuels, name... show full transcript
Worked Solution & Example Answer:6. Hydrogen gas and the hydrocarbons ethyne and butane are all used as fuels - Leaving Cert Chemistry - Question 6 - 2008
Step 1
What are (i) hydrocarbons?
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Answer
Hydrocarbons are organic compounds consisting only of hydrogen and carbon atoms. They are the fundamental building blocks of many fuels.
Step 2
What are (ii) fuels?
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Fuels are substances that release heat (energy) when burned. They can be in solid, liquid, or gaseous forms.
Step 3
(i) Which of the three fuels, named above, is a major component of liquid petroleum gas (LPG) used as a fuel in patio heaters?
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Answer
The major component of liquid petroleum gas (LPG) used as a fuel in patio heaters is butane.
Step 4
(ii) Which of the three fuels is used as a fuel for space rockets?
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Answer
The fuel used for space rockets is hydrogen.
Step 5
Write structural formulas for the hydrocarbons ethyne and butane.
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The structural formula for ethyne is:
extH−CextC−H
The structural formula for butane is:
extCH3extCH2extCH2extCH3
Step 6
Name one of the fractions obtained by the fractionating process.
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One of the fractions obtained is naphtha.
State where this fraction is collected from, from high, from the middle or from low down the fractioning column:
This fraction is collected from the middle of the fractionating column.
One major use of this fraction:
Naphtha is mainly used for producing petrol and plastics.
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