The table shows information about two alkenes - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Question 4
The table shows information about two alkenes.
Complete the table to show the names and structures of these alkenes.
(a) ethen
(b) (i) Ethene is an unsaturated com... show full transcript
Worked Solution & Example Answer: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 Ethene and the structure can be represented as:
H H
| |
C = C
| |
H H
This structure features a double bond between the carbon atoms.
Step 2
State what is meant by unsaturated.
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Answer
Unsaturated refers to a molecule that contains one or more double bonds or triple bonds between carbon atoms, allowing for the possibility to add more atoms.
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 is observed. The bromine water, which is originally orange, becomes colorless due to the addition reaction where bromine reacts with the ethene.
Step 4
Explain what is meant by cracking.
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Answer
Cracking is a process used to break down larger hydrocarbon molecules into smaller, more useful hydrocarbons or alkenes. This process involves the decomposition of long chains of hydrocarbons into smaller molecules.
Step 5
Complete the sentence by putting a cross ⨉ in the box next to your answer.
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Answer
The correct answer for the reaction taking place is:
D ● polymerisation
because molecules of ethene join together to form a long-chain molecule known as polyethylene.
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 causes problems because plastic is non-biodegradable; it does not decompose naturally and can persist in the environment for hundreds of years. This accumulation can lead to land contamination, harm to wildlife, and pollution of soil and water resources.
