6. (a) Which of the following statements about alkanes is correct?
Put a cross (✗) in the box next to your answer - Edexcel - GCSE Chemistry - Question 6 - 2013 - Paper 1
Question 6
6. (a) Which of the following statements about alkanes is correct?
Put a cross (✗) in the box next to your answer.
☐ A alkanes turn bromine water orange
☐ B alkanes... show full transcript
Worked Solution & Example Answer:6. (a) Which of the following statements about alkanes is correct?
Put a cross (✗) in the box next to your answer - Edexcel - GCSE Chemistry - Question 6 - 2013 - Paper 1
Step 1
Which of the following statements about alkanes is correct?
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Answer
The correct statement is C: alkenes are unsaturated hydrocarbons. Alkenes contain a carbon-carbon double bond, making them unsaturated compared to alkanes, which are saturated hydrocarbons.
Step 2
The table shows two monomers and the polymers they form.
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Answer
monomer structure
name of polymer formed
polymer structure
[ \text{H}_2C=CH-} ]
poly(ethene)
[ -[ \text{CH}_2 - \text{CH}_2 ]_n -]
[ \text{H}_2C=CH-CH_3 ]
poly(propene)
[ -[ \text{CH}_2 - \text{CH}- ]_n -]
Step 3
Explain a problem caused by the disposal of polymers.
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Answer
One significant problem caused by the disposal of polymers is that many are non-biodegradable. This means they do not decompose easily and can persist in landfill sites for a very long time, leading to increased waste and environmental pollution.
Step 4
Explain the properties required of a good fuel.
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Answer
A good fuel should possess the following properties:
Burning considerations: It should ignite easily and burn efficiently, releasing a substantial amount of energy when combusted.
Usage considerations: It should be safe to transport, easy to store, and reasonably cheap to obtain. Additionally, it should produce minimal harmful emissions when burned.
