6. Hydrogen (H₁), methane (C₁H₄), ethyne (C₂H₂) and butane (C₄H₁₀) are all combustible - Leaving Cert Chemistry - Question 6 - 2011
Question 6
6. Hydrogen (H₁), methane (C₁H₄), ethyne (C₂H₂) and butane (C₄H₁₀) are all combustible.
(a) Which of these gases forms the principal component of (i) natural gas, (... show full transcript
Worked Solution & Example Answer:6. Hydrogen (H₁), methane (C₁H₄), ethyne (C₂H₂) and butane (C₄H₁₀) are all combustible - Leaving Cert Chemistry - Question 6 - 2011
Step 1
Which of these gases forms the principal component of (i) natural gas
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Answer
The principal component of natural gas is methane (C₁H₄).
Step 2
Which of these gases forms the principal component of (ii) bottled gas used to fuel patio heaters
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Answer
The principal component of bottled gas used to fuel patio heaters is butane (C₄H₁₀).
Step 3
Which of these gases forms the principal component of (iii) a fuel used in high temperature cutting equipment
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Answer
The fuel used in high temperature cutting equipment is ethyne (C₂H₂).
Step 4
Why are mercaptans added to both natural gas and liquid petroleum gas?
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Answer
Mercaptans are added to natural gas and liquid petroleum gas for smell and safety reasons, allowing for easy detection of gas leaks.
Step 5
Give a major use of (i) kerosene
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Answer
Kerosene is primarily used as aviation fuel and for heating.
Step 6
Give a major use of (ii) the residue fraction (bitumen)
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Answer
The residue fraction (bitumen) is used for road surfacing, roofing, and waterproofing.
Step 7
Identify a solid X and a liquid Y suitable for this preparation.
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Answer
Solid X is calcium carbide (CaC₂) and liquid Y is water (H₂O).
Step 8
Describe what you would see if a sample of ethyne gas was burned in air
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Answer
When ethyne gas is burned in air, you would observe a sooty, smoky flame due to incomplete combustion.
Step 9
Write a balanced equation for the complete combustion of ethyne in oxygen
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Answer
The balanced equation for the complete combustion of ethyne is:
ightarrow 2CO₂ + H₂O$$
Step 10
Give one advantage of using hydrogen as a fuel
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Answer
One advantage of using hydrogen as a fuel is that it burns cleaner than petrol, producing only water vapor as a byproduct.
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