UV-VIS Spectroscopy

UV-VIS is a type of

• Molecular spectroscopy

• Atomic Spectroscopy

• Scattering Sectroscopy

• Relection spectroscopy

Based on the color wheel given, when a light hit a green object

• Absorption occur between 490-560nm

• Absorption observed from 620 to 800nm

• Absorption observed from 400 as well as near 800nm

• Absorb 580 to 560nm

UV-VIS is a selective analytical method

• True

• False

Which types of transition require a lot of energy?

• Sigma-sigma antibonding

• n to sigma antibonding

• pai to pai antibonding

• n to pai antibonding

as the transition energy become higher

• wavelength of absorption become longer

• Wavelength of absorption become shorter

• The molecule react at lower frequency

• The molecule absorb at longer wavelength

_____________________unsaturated organic functional groups that absorb in the UV-VIS

• Chromophore

• Auxochrome

• Conjugation

• Carbonyl

As the number of auxochrome increase

• The wavelength of absorbtion become shorter

• The wavelength of absorption become longer

The hydrogen bonding interaction between analytes and solvent will cause the spectrum

• Shift to a higher wavelength

• Shift to a shorter wavelenth

• Absorb at high intensity

• Absorb at lower intensity

UV cut off means

• The lowest wavelength before the subject absorb the radiation

• The highest wavelength before the subject absorb the radiation

Filter can be used for UV-VIS spectrum

• True

• False