Exam 3

• Elastic interactions do not exchange energy.
• Elastic interactions result in waves
• Inelastic interactions exchange energy from light to matter.
• Inelastic interactions are particles/photons.
• Wavelength does not change if there is no change in medium

  True
• Increasing wavelength decreases frequency
• Velocity and wavelength are medium-dependent
• Frequency is medium independent.
• Reflection is elastic, and it is a change in direction
• n is the index of refraction
• Higher n = slower
• Refraction is an elastic interaction.
• Transmission is an elastic interaction.
• Transmission is light passing through something
• Dispersion is an elastic interaction.
• Scatter is an elastic interaction.
• Absorption is in inelastic interaction.
• High absorbance means a low transmission
• As energy of a photon increases, wavelength decreases
• Atom enters excited electronic state after absorbing a photon
• Ionization results in a charge
• Excited maintains neutrality
• Is energy medium independent?

  Yes
• Low absorbance means a high transmission
• Concentration and absorbance are linear
• Path length and absorbance are linear
• When choosing a wavelength to create a calibration curve with, choose the one that corresponds to the largest absorption.
• Corrected absorbances are used when the blank does not have an absorbance of 0.
• Deprotonated curves are mirrored protonated curves.
• The point at which the protonated and deprotonated curves cross is the isobestic point.
• Emission can measure smaller samples than transmission.
• The ground electronic state is when all electrons are in their lowest possible configuration.
• For all atoms, the wavelength absorbed is equal to the wavelength emitted.
• Atoms have line spectra.
• Molecules have broad spectra.
• Bonds vibrate in molecules.
• Emission spectrums are mirrored absorbance spectrum that are red shifted.
• Molecules in the ground electronic state cannot emit photons.
• Heat/infrared light can cause vibration.
• Vibrational relaxation is the giving up of heat to the environment and it can occur in the electronic ground and electronic excited state of molecules.