Methane, CH₄, is a hydrocarbon - Edexcel - GCSE Chemistry - Question 3 - 2017 - Paper 1
Question 3
Methane, CH₄, is a hydrocarbon.
Chlorodifluoromethane can be formed from methane. A diagram of one molecule of this compound is
Cl
|
F—C—F
|
H
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Worked Solution & Example Answer:Methane, CH₄, is a hydrocarbon - Edexcel - GCSE Chemistry - Question 3 - 2017 - Paper 1
Step 1
Explain whether or not this molecule is a hydrocarbon.
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Answer
This molecule is not a hydrocarbon because a hydrocarbon consists of only carbon and hydrogen atoms. Since chlorodifluoromethane contains chlorine atoms in addition to carbon and hydrogen, it cannot be classified as a hydrocarbon.
Step 2
State what this shows about the structure of this compound.
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Answer
The fact that the orange color remains when chlorodifluoromethane is bubbled through bromine water suggests that it does not contain any double bonds. Bromine water is decolorized in the presence of alkenes, indicating that chlorodifluoromethane is likely saturated.
Step 3
Complete the balanced equation for this reaction.
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Answer
The balanced equation for the decomposition of chlorodifluoromethane is:
2CHClF2→C2F4+2HCl
Step 4
State the type of reaction that occurred when tetrafluoroethene gas formed the solid.
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Answer
The type of reaction that occurred is a polymerization reaction, where tetrafluoroethene gas undergoes polymerization to form a solid polymer.
Step 5
Deduce the name of the solid formed.
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Answer
The name of the solid formed is polytetrafluoroethylene (PTFE), commonly known as Teflon.
