Flashcards in Chem Test 2 Deck (39):
one billion of a meter (1E10^-9)
Electromagnetic Spectrum (from shortest wavelength to longest)
gamma, X-rays, UV, visible, IR, microwave, radio
Electromagnetic spectrum (from longest to shortest wavelength)
radio, microwave, IR, Visible, UV, X-Rays, Gamma rays
Wavelength (in nanometers) of visible
Purple -- short or long?
short, 400 nm
Red -- short or long?
long, 700 nm
UV, X-Rays, Gamma Rays
frequency (v) formula
speed of light (c) / wavelength (lambda) in meters
relationship between frequency and wavelength
Energy (E) formula
(h*c) / wavelength (lambda) or h*v
speed of light
3 X 10^8 m*s^-1
Planck's Constant (h)
6.626 X 10^-34 Js
Energy's relationship to wavelength?
inversely proportional, as wavelength decreases energy increases
Green, Red, Violet, Yellow. In order of increasing energy per photon
violet > green > yellow > red
What happens to UV-C?
absorbed in the upper atmosphere, both oxygen and ozone absorb light of these wavelengths
O2 --> UV photon
2 O, O2 + O--> O3
Easier to break: O2 or O3
the first set of natural steady-state reactions proposed for stratospheric ozone, it includes chemical reactions for both ozone formation and decomposition
<2 (low) to 11+ (high)
How is ozone formed? (Basic formula)
Energy + 3 O2
Formula for number of shared electrons?
Shared Electrons = Needed - Actual
Formula for formal Charge
FC = Valence - (# of electrons + 3 of bonds)
280-320 nm, most UV-B is absorbed by O3 in the stratosphere
320-400least damaging, reaches Earth's surface in greatest amount
B - needs 6, Be - 4, H - 2
amount of UV radiation reaching a detector at ground level is correlated to the amount of ozone in column
c = ... (in terms of v and lambda)
v * lambda
when will molecular geometries be different?
When there are lone pairs on the central atom
3 electron regions
4 electron regions
5 electron regions
6 electron regions
unit for molar mass?
1 mol =
6.02E23 atoms = 1 mol