4. The table shows information about two alkenes - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Question 4
4. The table shows information about two alkenes.
Complete the table to show the names and structures of these alkenes.
(a)
name structure of a molecule
ethene
(... show full transcript
Worked Solution & Example Answer:4. The table shows information about two alkenes - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Step 1
Complete the table to show the names and structures of these alkenes.
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Answer
The name of the alkene is Propene. The structure of the molecule is represented as follows:
H H
\ /
C=C
/ \
H H
Step 2
State what is meant by unsaturated.
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Answer
An unsaturated compound contains a double bond between carbon atoms. This means that it has the capacity to add additional atoms or groups into its structure, distinguishing it from saturated compounds, which only have single bonds.
Step 3
Describe what is seen when ethene is passed into bromine water.
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Answer
When ethene is passed into bromine water, a color change occurs. Initially, the bromine water is orange; however, after the ethene is introduced, it becomes colorless, indicating that a reaction has taken place.
Step 4
Explain what is meant by cracking.
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Answer
Cracking refers to the process of breaking down larger hydrocarbons from crude oil into smaller molecules or chains. This can involve the decomposition of larger alkane molecules to produce more useful products, such as alkenes and lighter hydrocarbons.
Step 5
Complete the sentence by putting a cross ✗ in the box next to your answer.
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Answer
The reaction taking place when molecules of ethene are reacted to form poly(ethene) is D) polymerisation.
Step 6
Explain why the presence of waste plastic in landfill sites causes problems.
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Answer
The presence of waste plastic in landfill sites poses significant environmental concerns. Plastics do not decompose easily, leading to long-term pollution. They can also release harmful chemicals into the soil and waterways, negatively impacting ecosystems. Furthermore, the accumulation of plastics can hinder land use and contribute to visual pollution.
