SPECTROSCOPY EXAM WITH CORRECT SOLUTION #3
Spectroscopy - correct answer the study of the interaction of electromagnetic radiation
with matter
Mass spectrometry - correct answer provides insight into the mass of a molecule and
the fragment that compose molecular weight
Mass spectrometry does not involve what? - correct answer electromagnetic radiation
In a ______________, a sample in the gas phase is ionized, and the mass to charge
ratio m/z and relative abundance of the resulting ions are measured - correct answer
Mass spectrometry
Any species with an unpair e- is called: - correct answer radical
The process of producing molecular ion, M+(g) is called - correct answer electron
impact ionization
Mass spectrometry is used to - correct answer Determine a compound's mass/MW
A mass spectrum plots the _______________(y-axis) of gaseous ions against the
_____________ , m/z (x-axis) - correct answer relative abundance;
Mass-to-charge ratio
Electron impact ion knocks off an electron from a molecule of the sample to produce the
_________ - correct answer molecular ion, M+
Nitrogen Rule (MS) - correct answer Odd # of MW = Odd # of N
Even # of MW = Even # of N or none
_______________ gives rise to the peaks with smaller m/z values - correct answer
Fragmentation
The most intense (tallest) peak in a mass spectrum is called the - correct answer base
peak
The value of m/z is __________ to the ion's mass - correct answer equal
The presence of 13C gives rise to an __________ that is typically much smaller than
the M+ peak - correct answer M+1 peak
The presence of bromine and chlorine can be identified by the intensity of an
_____________ - correct answer M+2 peak
For chlorine, the M+ and M+2 ratio is:
