(short) mass spec quiz flashcards (S3.2.8-11)

Question 1

purpose of mass spec

Answer 1

m/z of a charged particle (charge is usually +1) tells us the total mass of the molecule. Also, m/z of different fragments can tell us what the different pieces of the molecules are (what elements are contained, based on the mass)

Question 2

purpose of IR spec

Answer 2

IR spec is cheaper, easier, and safer than mass spec. It tells us the type of bonds present (because diff. bonds absorb diff. wavelengths of IR radiation)

Question 3

purpose of H1NMR spec

Answer 3

proton nuclear magnetic resonance spectrometry can tell us:
1. # diff. chem environments containing protons (# of signals, ignoring the one at 0)
2. type of protons in each chem. env. (based on chemical shift, in ppm, given in data booklet)
3. ratio of the # of protons in each chem. env. (from integration trace)
4. # hydrogens on the adjacent carbon - splitting pattern minus 1

Question 4

h1nmr x and y axis

Answer 4

x - chemical shift (ppm), y - absorbance

Question 5

infrared x and y axis

Answer 5

x - wavenumber, y - %transmittance

Question 6

mass spec x and y axis

Answer 6

x - m/z, y - relative intensity