CH 18 Vocab

Question 1

Absorbance

Answer 1

A = P0/P were P0 is the radiant power of light ( power per unit area) striking the sample at one side and P is the radiant power emerging from the other side. Directly proportional to concentration
formally called optical density

Question 2

absorption spectrum

Answer 2

a graph of absorbance or molar absorptivity versus, wavelength, frequency, or wavenumber of light

Question 3

Beer’s Law

Answer 3

relates the absorbance of a sample to its concentration, pathlength, and molar absorptivity

A=abc

Question 4

chromophore

Answer 4

the part of a molecule responsible for absorption of light of a particular frequency

Question 5

cuvette

Answer 5

a cell with transparent walls used to hold samples for spectrophotometric measurements

Question 6

derivatization

Answer 6

chemical alteration to attach a group to a molecule so that the molecule can be detected conveniently. Alternatively, treatment can alter volatility or solubility to allow easier seperation

Question 7

electromagnetic spectrum

Answer 7

the whole range of electromagnetic radiation, including visible light, radio waves, X-rays etc

Question 8

electronic transition

Answer 8

one in which an electron goes from one energy level to another

Question 9

a graph of luminescence intensity versus luminescence wavelength (or freq or wavenumber) obtained with a fized excitation wavelength

Answer 9

emission spectrum