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Physical Properties of Organic Compounds

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Outlining the intermolecular forces present in different organic compounds and structures including worked examples and tips on ranking molecules based on melting and boiling points

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  • September 27, 2021
  • 1
  • 2021/2022
  • Interview
  • Unknown
  • Unknown
  • Secondary school
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physical properties
that we want to determine for
two common physical properties organic compounds
'




melting point / boiling point and
solubility e- ÷ random movement
-




LDF :




factors that Affect M.p and b. p .
DD :
fixed polar molecule
1. intermolecular forces
:
( DF , DD , HB
HB :

powerful version , 01N , -5

↳ When
stronger forces are more is required
present ,
energy
to break apart molecules
Shape / linear / less branches forces
2.
branching

stronger
:




spherical / lots of branches ⇒ weaker forces

LDFDDH-Bonding- tips on
ranking M.p / b. p
✗ 1) Compare size IIDF ) bigger molecules
Alkanes ✓ ✗ ,




✓ ✗ have stronger forces
alkenes ✗
paraffin wax


CH4lq) 9 (81-11811) { Csothoacs )
Alkynes
✓ ✗

methane octane
✓ higher m.pe/b.p
benzene ✗ ✗

✓ ✓ 2) if functional
Alkyl halides comparing
✗ same # of C 's , check


alcohol ✓ ✓ ✓ Ctlyig) < CHz0Hu)
group
:




W ✓ if shape
carboxylic ✓ 3)
comparing isomers ,
look at

acids -12°C
-1 "
extra branch
esters ✓ ✓✓ ✗ >
higher mplbp
fractional distillation
b. Of different compounds to
p
-
.




separate crude oil
rate the
following compounds from highest to lowest b'
P '



↳ crude oil : raw product from the
2-
methyl pentane hexane a- 2-
dimethyl butane oil rig , mix of hydrocarbons
fractional distillation column used to
'




I 3
- i. 2 neat crude oil ,
materials separate
based on b. p
' i .




: i
'


↳ smallest molecules
gototop
-



.




( 110W b-
p)
( 61-116 61-114 ( 61-1,4
.





largest molecules go to bottom
( high b. )
p

pentanoic acid pent 2. ene
butyl methanoate pentan -1-01
-




i no
°" °

, 3 4 got
greater IMF =


greater M.p and b. p .




polar dissolves polar polar non-polar
non-polar dissolves non-polar alcohol, halides , c. acid alkane , alkene , alkyne
liters aromatic
water

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