Transcript Class 5 011806 - Westmont homepage server

Q: Does smell weigh anything?
Yes, smells have weight, or mass. When you smell something, your nose
is detecting a few, a very few, molecules floating around in the air. Think
about that next time you wake up and smell the coffee, or walk into the hall
and smell dinner in the kitchen, or walk into a bathroom and smell something
else. These molecules have mass and thereby weight, albeit a tiny amount.
The key to your sense of smell is that your olfactory faculties--your nose,
taste buds, and brain--are so very sensitive. Just a few micrograms
(millionths of the weight of, say, a mosquito) of gasoline or french-fry oil in
the air, and we're in business detecting chemicals.
We humans can distinguish about 10,000 different smells.
And we do it in just a few milliseconds.
Detecting Functional Groups:
Smell
O
H
O
H
OCH3
OH
cinnamaldehyde
vanillin
Detecting Enantiomers
R-(-)-carvone
Smells like spearmint
S-(+)-carvone
Smells like caraway
Naming Alcohols
• The parent hydrocarbon is the longest continuous chain
containing the functional group.
• The parent hydrocarbon is numbered in the direction that
gives the functional group suffix the lowest possible
number.
• If there is a functional group suffix and a substituent, the
functional group suffix gets the lowest possible number.
• If the same number for the functional group suffix is
obtained in both directions, the chain is numbered in the
direction that gives the substituent the lowest possible
number.
• If there is more than one substituent, the substituents are
cited in alphabetical order.