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Learning objectives. Hydrocarbons. Bonds. Alkanes. Alkanes. Name. Formula. Methane Ethane Propane Butane Pentane Hexane Heptane Octane Nonane Decane And so on. CH 4 C 2 H 6 C 3 H 8 C 4 H 10 Work out the empirical formula . Bigger Alkanes. No. of carbons. name. 11 12 13

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alkanes1
Alkanes

Name

Formula

  • Methane
  • Ethane
  • Propane
  • Butane
  • Pentane
  • Hexane
  • Heptane
  • Octane
  • Nonane
  • Decane
  • And so on
  • CH4
  • C2H6
  • C3H8
  • C4H10
  • Work out the empirical formula
bigger alkanes
Bigger Alkanes

No. of carbons

name

  • 11
  • 12
  • 13
  • 14
  • 15
  • 20
  • 21
  • 22
  • 30
  • 31
  • 40
  • 50
  • 100
  • Undecane
  • Dodecane
  • Tridecane
  • Tetradecane
  • Pentadecane
  • Icosane
  • Henicosane
  • Docosane
  • Triacontane
  • Hentriacontane
  • Tetracontane
  • Pentacontane
  • Hectane

What would be the names of straight chain alkanes containing 33 and 47 carbons?

the number of possible isomers increases with chain length
The number of possible isomers increases with chain length

Name and (no. of carbons)

Number of possible isomers

  • Butane (4)
  • Pentane (5)
  • Hexane (6)
  • Heptane (7)
  • Octane (8)
  • Nonane (9)
  • Decane (10)
  • Pentadecane (15)
  • Icosane (20)
  • Tetracontane (40)
  • 2
  • 3
  • 5
  • 9
  • 18
  • 35
  • 75
  • 4347
  • 366 319
  • 62 491 178 805 831
types of formulae
Types of formulae
  • There are four ways of showing formulae of organic compounds
  • Look at these examples for decane
  • 1. Molecular formulae: C10H22
  • 2. Condensed structural formulae:
  • CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3
  • 3. Structural formulae
  • 4. Line structure:
other side groups
Other side groups

Other options include aromatics – see later lessons and metals such as Iron, copper etc.

product of investigation
Product of investigation-
  • 1. Each of youwillform a new group to share whatyouhavelearnt and thisyouwill show on a poster.
  • 2. Eachgroupwilldevelopanactivity to helpreinforcelearningwiththewholeclass.
  • 3. Eachgroupwillprovide a presentation to give to thewholeclass
  • 4. Theclasswill complete 5 exercisesbasedonthesefivethemes.
  • 5. Members of eachgroupwill be responibleforhelpingstudents to clarifyanyfurtherdoubts once themarkedworkisreturned to them.