The infrared spectrum for methanol. CH 3 OH, is illustrated below. It shows the amount of light in the infrared region that methanol transmits as a function of wavelength. The vertical axis is the amount of light transmitted. At points near the top of the graph, most of the incident light is being transmitted by the sample (or, conversely, little light is absorbed). Therefore, the ″peaks″ or ″bands″ that descend from the top indicate light absorbed; the longer the band, the more light is being absorbed. The horizontal scale is in units of ″wavenumbers,″ abbreviated cm −1 . The energy of light is given by Planck′s law as E = hc /λ; that is, E is proportional to 1/λ. Therefore, the horizontal scale is in units of 1/λ and reflects the energy of the light incident on the sample. (a) One point on the horizontal axis is marked as 2000 cm −1 . What is the wavelength of light at this point? (b) Which is the low energy end of this spectrum (left or right), and which is the high energy end? (c) The broad absorption at about 3300-3400 cm −1 indicates that infrared radiation is interacting with the OH group of the methanol molecule. The narrower absorptions around 2800-3000 cm −1 are for interactions with C—H bonds. Which interaction requires more energy, with O—H or with C—H?
The infrared spectrum for methanol. CH 3 OH, is illustrated below. It shows the amount of light in the infrared region that methanol transmits as a function of wavelength. The vertical axis is the amount of light transmitted. At points near the top of the graph, most of the incident light is being transmitted by the sample (or, conversely, little light is absorbed). Therefore, the ″peaks″ or ″bands″ that descend from the top indicate light absorbed; the longer the band, the more light is being absorbed. The horizontal scale is in units of ″wavenumbers,″ abbreviated cm −1 . The energy of light is given by Planck′s law as E = hc /λ; that is, E is proportional to 1/λ. Therefore, the horizontal scale is in units of 1/λ and reflects the energy of the light incident on the sample. (a) One point on the horizontal axis is marked as 2000 cm −1 . What is the wavelength of light at this point? (b) Which is the low energy end of this spectrum (left or right), and which is the high energy end? (c) The broad absorption at about 3300-3400 cm −1 indicates that infrared radiation is interacting with the OH group of the methanol molecule. The narrower absorptions around 2800-3000 cm −1 are for interactions with C—H bonds. Which interaction requires more energy, with O—H or with C—H?
The infrared spectrum for methanol. CH3OH, is illustrated below. It shows the amount of light in the infrared region that methanol transmits as a function of wavelength. The vertical axis is the amount of light transmitted. At points near the top of the graph, most of the incident light is being transmitted by the sample (or, conversely, little light is absorbed). Therefore, the ″peaks″ or ″bands″ that descend from the top indicate light absorbed; the longer the band, the more light is being absorbed. The horizontal scale is in units of ″wavenumbers,″ abbreviated cm−1. The energy of light is given by Planck′s law as E = hc/λ; that is, E is proportional to 1/λ. Therefore, the horizontal scale is in units of 1/λ and reflects the energy of the light incident on the sample.
(a) One point on the horizontal axis is marked as 2000 cm−1. What is the wavelength of light at this point?
(b) Which is the low energy end of this spectrum (left or right), and which is the high energy end?
(c) The broad absorption at about 3300-3400 cm−1 indicates that infrared radiation is interacting with the OH group of the methanol molecule. The narrower absorptions around 2800-3000 cm−1 are for interactions with C—H bonds. Which interaction requires more energy, with O—H or with C—H?
At an electrified interface according to the Gouy-Chapman model, what types of interactions do NOT occur between the ions and the solvent according to this theory?
Please predict the products for each of the
following reactions.
Clearly show the regiochemistry (Markovnikov
vs anti-Markovnikov) and stereochemistry
(syn- vs anti- or both).
If a mixture of enantiomers is formed, please
draw all the enantiomers.
Hint: In this case you must choose the best
answer to demonstrate the stereochemistry of
H2 addition.
1.03
2. (CH3)2S
BIZ
CH₂OH
2. DMS
KMnO4, NaOH
ΖΗ
Pd or Pt (catalyst)
HBr
20 1
HBr
ROOR (peroxide)
HO
H-SO
HC
12 11 10
BH, THE
2. H2O2, NaOH
Brz
cold
HI
19
18
17
16
MCPBA
15
14
13
A
Br
H₂O
BH3⚫THF
Brz
EtOH
Pd or Ni (catalyst)
D₂ (deuterium)
1. Os04
2. H2O2
CH3CO3H
(peroxyacid)
1. MCPBA
2. H₂O*
H
B
+
H
H
H
"H
C
H
H
D
Explain how Beer’s Law can be used to determine the concentration in a selected food sample. Provide examples.
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell