Homologous series

• What are the elements present in the alkanes?

  Carbon and Hydrogen
• Name the first 8 alkanes and thier molecular formula

  Methane CH4, Ethane C2H6, Propane C3H8, Butane C4H10, Pentane C5H12, Hexane C6H14, Heptane C7H16, Octane C8H18
• What is the general formula for the Alkanes?

  CnH2n+2
• What happen as the carbon chain increases?

  The boiling point increases
• As the size of the molecule increases what happens to th intermolecular forces?

  They increase
• What happens when an alkane is fully burnt in oxygen?

  CO2 and water is produced
• What is an isomer?

  An isomer is a molecule that has the same molecular formula but different structural formula
• What are the 3 things different for isomers?

  Structure, name and properties
• What are the first 6 members if the cyclocalkanes?

  Cyclopropane, Cyclobutane, Cyclopentane, Cyclohexane, Cycloheptane, Cycloctane
• What is the general formula for the cycloalkanes?

  CnH2n
• What are compounds with at least one carbon to carbon double bond called?

  Unsaturated
• What do we use to see if a compound has a carbon to carbon double bond?


  We use bromine water
• If a compound does have a carbon to carbon double bond, what happens to the bromine water?


  It goes from orange to colourless
• What is the homologous series?

  It is a family of molecules/compounds that can be represented by a general formula, have similar chemical properties and a gradual change in physical properties