Ozone Story Flashcards
How do you convert ppm to % concentration?
÷ 10,000
How do you convert % concentration to ppm?
x 10,000
Speed of light=
3x10^8 m/s
wavelength x frequency
m) (s^-1
Energy of a photon=
J
Planck’s constant x frequency
6.63x10^-34 Js) (s^-1
How do you convert the energy of a photon of a molecule to a mole of that compound?
Multiply the energy of a photon by Avagadro’s constant (6.02x10^23)
What happens when radiation interacts with matter?
Change of rotational energy, change of vibrational energy, or change of electronic energy
What causes a change in rotational energy?
When microwave radiation is absorbed by a molecule.
Energy change is between 10^-22 and 10^-20 joules
What causes a change in vibrational energy?
When infrared radiation is absorbed by a molecule.
Energy change is between 10^-20 and 10^-19 joules,
What causes a change in electronic energy?
When visible light/UV radiation is absorbed by a molecule. Energy change is between 10^-19 and 10^-16 joules
Why are a range of energy values given?
The particular value of energy change depends on the substance involved
What kind of electronic changes occur when substance absorbs UV radiation?
Electrons get excited to a higher energy level, if low amount of energy is involved
If higher energy photons are involved, bonding electrons no longer hold atoms together (photodissociation)
Very high energy photons cause ionisation
Define heterolytic fission
When both of the shared pair of electrons go to one atom when a bond breaks
What is formed when a bond breaks heterolytically?
One positively charged ion and one negatively charged ion
Where is heterolytic fission most common?
In polar bonds
Define homolytic fission
When one of the shared pair of electrons go to each atom when a bond breaks
