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
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F - C - F
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... show full transcript
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
The molecule chlorodifluoromethane is not a hydrocarbon because it contains chlorine and fluorine atoms in addition to carbon and hydrogen. A hydrocarbon is defined as a compound consisting only of carbon and hydrogen atoms. Therefore, since chlorodifluoromethane has other elements, it does not qualify as a hydrocarbon.
Step 2
State what this shows about the structure of this compound.
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Answer
The lack of a color change when chlorodifluoromethane is bubbled through bromine water indicates that the compound does not have any double or triple carbon-carbon bonds. Bromine water will decolorize in the presence of unsaturated hydrocarbons, but since the orange color remains, this compound must be saturated.
Step 3
Complete the balanced equation for this reaction.
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Answer
The balanced equation for the decomposition reaction 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 condensation. During this process, tetrafluoroethene gas can polymerize under certain conditions, leading to the formation of a solid.
Step 5
Deduce the name of the solid formed.
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Answer
The solid formed is polytetrafluoroethylene, commonly known as PTFE or Teflon.
