1. Diagram 1 shows an apparatus used for the preparation and collection of ethyne gas (C₂H₂) - Leaving Cert Chemistry - Question 1 - 2009
Question 1
1. Diagram 1 shows an apparatus used for the preparation and collection of ethyne gas (C₂H₂).
(a) Name the homologous series to which ethyne belongs.
(b) Identify ... show full transcript
Worked Solution & Example Answer:1. Diagram 1 shows an apparatus used for the preparation and collection of ethyne gas (C₂H₂) - Leaving Cert Chemistry - Question 1 - 2009
Step 1
Name the homologous series to which ethyne belongs.
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Answer
Ethyne belongs to the homologous series known as alkyne or acetylenes.
Step 2
Identify the liquid X and the solid Y. Describe the appearance of the solid Y.
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Answer
The liquid X is water (H₂O). The solid Y is calcium carbide (CaC₂), which appears greyish, brownish, or blackish and is a dirty solid.
Step 3
What change would you expect to observe in the appearance of the bromine water? What explanation would you give for this observation?
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Answer
The bromine water would decolorize and become colorless. This occurs because ethyne is an unsaturated compound containing multiple bonds, allowing it to undergo bromine addition.
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 lot of soot or dark smoke is produced, and it creates a highly luminous flame.
Step 5
Identify the gas that is mixed with ethyne. What use is made of the very hot flame?
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Answer
The gas that is commonly mixed with ethyne is oxygen. This mixture is used in cutting equipment, particularly in oxyacetylene torches.
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