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1.6 ALKANES
· Alkanes are saturated hydrocarbons = only contains single C-C bonds.
· General formula: C
n

H
2n+2

· Cycloalkanes ­ when carbon atoms from a ring other than benzene, formula: C
N

H
2n

(same as alkenes because end hydrogens not required)

Fractional distillation ­
the process…

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· decrease with brancing, less closely packed, vdWs less effective

4. Condense to liquid. Mixture that condenses is piped off
3. Vapour moves up tower via series of trays containing bubble caps until it reaches tray that
has a lower itself
T
b

than

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· Different components are drawn off at different levels in fractionating
column because of temperature gradient
· Fractional distillation is a physical process so no covalent bonds within the
molecules are broken. It's the van der Waals forces between molecules
that are broken during vaporisation and reform on condensing.

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Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
1.6 ALKANES
· Alkanes are saturated hydrocarbons = only contains single C-C bonds.
· General formula: C
n

H
2n+2

· Cycloalkanes ­ when carbon atoms from a ring other than benzene, formula: C
N

H
2n

(same as alkenes because end hydrogens not required)

Fractional distillation ­
the process…

Page 3

Preview of page 3
· decrease with brancing, less closely packed, vdWs less effective

4. Condense to liquid. Mixture that condenses is piped off
3. Vapour moves up tower via series of trays containing bubble caps until it reaches tray that
has a lower itself
T
b

than

Page 4

Preview of page 4

Page 5

Preview of page 5
· Different components are drawn off at different levels in fractionating
column because of temperature gradient
· Fractional distillation is a physical process so no covalent bonds within the
molecules are broken. It's the van der Waals forces between molecules
that are broken during vaporisation and reform on condensing.

Comments

No comments have yet been made