Alkenes and Alkanes

  • Created by: Sunset
  • Created on: 13-05-13 19:04
What is an alkene?
A hydrocarbon with one or more C-C double bonds
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What is the general formula for alkenes?
CnH2n
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Which are unsaturated: alkenes or alkanes?
Alkenes
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What are the properties of short chain alkanes?
They are gases at room temperature because they have low boiling points. They ignite easily so they are volatile. They are not viscous.
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Why are long chain alkanes viscous?
The long chains get tangled reducing their runniness.
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How do you test whether a hydrocarbon is an alkane or an alkene?
Add bromine water. If it turns colourless it is an alkene.
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Why does bromine water turn colourless in alkenes?
The alkene reacts with the bromine because alkenes are unsaturated.
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What kind of reaction is cracking?
Thermal decomposition
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What are the products of the cracking of long chain alkanes?
An alkane and alkene
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Why are short chain alkanes in higher demand than long chain alkanes?
Long chain alkanes don't burn well so they aren't good fueld whereas short chain alkanes are good fuels because they burn well
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What is the name of the process in which many mononmers are turned into polymers
Polymerisation
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Plastic (polymers) are made from which kind of hydrocarbon?
Alkenes
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Other cards in this set

Card 2

Front

What is the general formula for alkenes?

Back

CnH2n

Card 3

Front

Which are unsaturated: alkenes or alkanes?

Back

Preview of the front of card 3

Card 4

Front

What are the properties of short chain alkanes?

Back

Preview of the front of card 4

Card 5

Front

Why are long chain alkanes viscous?

Back

Preview of the front of card 5
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