Hydrocarbons Key Words and Points

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1. Why does it make this colour change?

  • It is a substitution reaction as alkanes are saturated
  • It indicates the presence of an alkaline substance
  • It is an addition reaction as alkenes are unsaturated and react
  • It indicates the presence of acidity
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2. What is an isomer

  • The same molecular formula but different structures
  • The same structure but a different molecular formula
  • Different physical properties but the same molecular formula
  • A type of alkane which is unsaturated

3. What does an alkene do to bromine water?

  • A white smoke is given off when heat is applied
  • Turns red from orange
  • Decolourise
  • Turns green from orange

4. How many bonds can carbon atoms make?

  • 3
  • 4
  • 2
  • 1

5. What is an alkene?

  • A saturated alkane
  • An isomer of alkanes
  • When a hydrocarbon has one or more carbon-carbon covalent bonds
  • When an alkane is combusted


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