Think about this'

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Think about this.

• What are two characteristic properties of
  hydrocarbons ???

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Today

• More on organic molecules
• Hydrocarbons. Isomers.
• Getting energy

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Structures of Organic Molecules

• Organic molecules are made up of only a few
  elements
• C (4 bonds)
• H (1 bond)
• O (2 bond)
• N (3 bonds)

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Hydrocarbons (have C, H only)
H
H
C
H
H
CH4 methane Natural gas Cooking gas In swamps
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Hydrocarbons
Molecular formulas
H
C2H6 ethane C3H8 propane C4H10 butane C7H16
heptane C8H18 octane C10H22 decane
H
C
Gases at RT!
H
H
CH4 methane
Liquids at RT!
More than about 16 Cs Solid at RT
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Question What is the structural
formula of butane (C4H10)? (Butane gas)
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Isomers Same molecular formula, different
structures
Draw isomers for C5H12 (pentane), a liquid in
paint thinner
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Fragrance of Magnolias contains Decane C10H22
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Resin of Jeffrey Pines contains Heptane C7H16
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Ethylene (Ethene), a ripening hormone
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Gas chromatogram of a petroleum sample
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A picture to think about .
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Complete combustion of an organic compound, i.e.
with plenty of oxygen, forms the products CO2 and
H2OExample Combustion of C6H14 (hexane found
in gasoline) C6H14 O2 CO2 H2O
E!Balanced equation 2 C6H14 19 O2
12 CO2 14 H2O
Combustion Burning
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HydrocarbonsExperiment!
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Next time
A sweet chapterSugars and sweet nectar

• Glucose and other organic molecules
• Molecules that can be left-handed or right-handed