O3 Flashcards
What is the function of the O3 layer?
The absorption of UV rays.
What have been the consequences of pollution?
A large hole over Antarctica, appearing over it every spring, largest in 2006.
What is the stratosphere?
Region lying between altitudes where temperature trends reverse, the bottom where it stops decreasing with height and begins to increase.
What are the two concentration measurements used to discuss gases within the atmosphere?
Absoloute and relative.
What is absolute concentration?
Number of molecules per cubic centimeter of air, or expressed as partial pressure.
What is the Ideal Gas Law?
This states that partial pressure id proportional to molar concentration, and thus molecular concentration per unit volume.
What is relative concentration?
This measures parts per x value, like amount of CO2 per 1 million molecules of air.
Why is relative concentration used?
Where concentrations are so small.
What is the absorption spectrum?
This graphically represents relative fraction of light absorbed by a molecule, as a function of wavelength.
What roles does O2 play in the atmosphere?
Filters UV light between 120-220nm above the stratosphere, and shorter than 120nm.
What filters UV from 220-290nm?
O3.
What UV does O3 not absorb?
290-320nm, thus 10-30%(depending on latitude), hits earth surface, this being UV-B.
What does E= hv describe?
Energy is related to frequency and the wavelength.
What does this imply?
That the lower the energy, the greater the wavelength.
How does photon energy relate to enthalpy change?
Proportional