Chem topic 6

• what are the units of wavelength

  meters, ^
• what is the unit of energy

  jules
• what is the unit of frequency

  1/s, Hz, 1/cm, V
• what is planks constant?

  6.63 x 10^-34 jxs
• what is the speed of light?

  3.0 x 10^8 m/s
• in the equation for energy, what two variables never change values?

  h and c
• in the equation for energy

  h and c go over ^
• remember that

  units must always be the same to cancel out
• which equation would you use to calculate for energy or frequency?

  c = ^ V
• energy goes up

  wavelength gets shorter
• energy goes down

  wavelength gets longer
• ionizing EMR has enough energy to

  remove electrons from atoms by breaking chemical bonds
• why is it called ionizing radiation?


  it creates an ion
• why do electrons come in pairs

  more stable
• what is a radical

  an electron not paired up
• why do radicals not exist for long

  want to fix as soon as possible
• how can dimers be undone

  enzymes
• how does ozone stop UVC

  ozone is constantly broken and remade by UVC, which absorbs it
• UVB can remove what from an ozone molecule

  oxygen
• which has more energy: uvc or uvb?

  uvc
• why can't UVB break ozone?

  does not have enough energy
• is it more difficult to make 2 radicals or 1?

  2
• what does infrared radiation do?

  excites molecules, makes them vibrate
• what do microwaves do

  orients molecules
• why can't microwaves make molecules vibrate?

  not enough energy
• how do microwaves make molecules line up?

  negative and positive charges attract
• what kind of radiation causes the greenhouse effect?

  infrared radiation
• why does IR cause global warming?

  frequency allows it to get trapped in certain gas molecules
• what do greenhouse gasses act as?

  sinks
• what are factors of molecules that are GHG's?

  shape, electron distribution, frequency it absorbs
• what is constructive interference?

  when an EMR and molecule have same frequency and interact
• what does constructive interference do?

  makes waves bigger (2 wavelengths added together)
• what is destructive frequency?

  when EMR and molecule do not have the same frequency and interact
• what does destructive frequency do?

  kills waves
• what are GHGs?

  gasses that can absorb IR
• why do atomic charges contribute to a gas being a GHG

  determines molecule's frequency