The diagram shows an apparatus that can be used for the preparation of ethyne gas, C2H2 - Leaving Cert Chemistry - Question 2 - 2003
Question 2
The diagram shows an apparatus that can be used for the preparation of ethyne gas, C2H2.
A liquid X is dropped onto the solid Y and the gas collected in test tubes a... show full transcript
Worked Solution & Example Answer:The diagram shows an apparatus that can be used for the preparation of ethyne gas, C2H2 - Leaving Cert Chemistry - Question 2 - 2003
Step 1
Identify the liquid X and the solid Y.
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Answer
Liquid X is water (H2O) and solid Y is calcium carbide (CaC2).
Step 2
Describe the appearance of the solid Y.
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Answer
The solid Y, calcium carbide, appears black or dark grey in color.
Step 3
Write a balanced equation for the reaction between X and Y producing ethyne.
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Answer
The balanced equation for the reaction is:
CaC2+2H2O→C2H2+Ca(OH)2
Step 4
What is observed when a sample of ethyne gas is burned in air?
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When ethyne gas is burned in air, a luminous (bright) flame is produced, indicating incomplete combustion, and sooty residues can form.
Step 5
Write a balanced equation for the combustion of ethyne in oxygen.
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The balanced equation for the combustion of ethyne in oxygen is:
2C2H2+5O2→4CO2+2H2O
Step 6
Describe a test you could carry out to show that ethyne is unsaturated.
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A test that could be carried out is by reacting ethyne with bromine in a solution. The decolorization of the bromine solution indicates that ethyne is unsaturated.
Step 7
Write an equation for the reaction taking place. Name the organic product.
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The equation for the reaction is:
C2H2+Br2→C2H2Br2
The organic product formed is dibromoethane.
Step 8
Give one major use of the gas.
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One major use of ethyne gas (acetylene) is in welding and cutting processes, specifically oxyacetylene welding.
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