Excessive exposure to sunlight increases the risk of skin cancer because some of the photons have enough energy to break chemical bonds in biological molecules. These bonds require approximately 250−800 kj/mol of energy to break. The energy of a single photon is given by E = h c / λ where E is the energy of the photon in j, h is Planck’s constant ( 6.626 × 10 − 31 J .s ) , and c is the speed of light ( 3.00 × 10 8 m / s ) . Determine which kinds of light contain enough energy to break chemical bonds in biological molecules by calculating the total energy in 1 mol of photons for light of each wavelength a. infrared light (1500nm) b. visible light (500 nm) c. ultraviolet light (150 nm)
Excessive exposure to sunlight increases the risk of skin cancer because some of the photons have enough energy to break chemical bonds in biological molecules. These bonds require approximately 250−800 kj/mol of energy to break. The energy of a single photon is given by E = h c / λ where E is the energy of the photon in j, h is Planck’s constant ( 6.626 × 10 − 31 J .s ) , and c is the speed of light ( 3.00 × 10 8 m / s ) . Determine which kinds of light contain enough energy to break chemical bonds in biological molecules by calculating the total energy in 1 mol of photons for light of each wavelength a. infrared light (1500nm) b. visible light (500 nm) c. ultraviolet light (150 nm)
Solution Summary: The author explains that the wavelength of electromagnetic radiation is used to determine the amount of energy carried by one of its photons.
Excessive exposure to sunlight increases the risk of skin cancer because some of the photons have enough energy to break chemical bonds in biological molecules. These bonds require approximately 250−800 kj/mol of energy to break. The energy of a single photon is given by
E
=
h
c
/
λ
where E is the energy of the photon in j, h is Planck’s constant
(
6.626
×
10
−
31
J
.s
)
, and c is the speed of light
(
3.00
×
10
8
m
/
s
)
.
Determine which kinds of light contain enough energy to break chemical bonds in biological molecules by calculating the total energy in 1 mol of photons for light of each wavelength
Consider the following gas chromatographs of Compound A, Compound B, and a mixture of Compounds A and B.
Inject
A
B
mixture
Area= 9
Area = 5
Area = 3
Area
Inject
.
མི།
Inject
J2
What is the percentage of Compound B in the the mixture?
Rank these according to stability.
CH3
H3C
CH3
1
CH3
H3C
1 most stable, 3 least stable
O 1 most stable, 2 least stable
2 most stable, 1 least stable
O2 most stable, 3 least stable
O3 most stable, 2 least stable
O3 most stable, 1 least stable
CH3
2
CH3
CH3
H₂C
CH3
3
CH3
CH
Consider this IR and NMR:
INFRARED SPECTRUM
TRANSMITTANCE
0.8-
0.6
0.4
0.2
3000
10
9
8
00
HSP-00-541
7
CO
6
2000
Wavenumber (cm-1)
сл
5
ppm
4
M
Which compound gave rise to these spectra?
N
1000
1
0
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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