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 of alkynes (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).
The appearance of the solid Y is greyish, brownish, or blackish, indicating it is a dirty solid.
Step 3
What change would you expect to observe in the appearance of the bromine water?
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I would expect the bromine water to decolourise and become colourless (palter).
Step 4
What explanation would you give for this observation?
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Answer
The explanation for this observation is that ethyne is unsaturated and has multiple bonds present, which allows for bromine addition to occur.
Step 5
What is observed when a sample of ethyne gas is burned in air?
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When ethyne gas is burned in air, it produces lots of soot or dark smoke and exhibits a highly luminous flame.
Step 6
Identify the gas that is mixed with ethyne. What use is made of the very hot flame?
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The gas that is commonly mixed with ethyne is oxygen.
The very hot flame produced is used for cutting equipment, often referred to as an oxyacetylene torch.
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