7. modern analytical techniques I (as)

Question 1

mass spec can

Answer 1

help identify compounds

Question 2

mass spectrum is made by and explain how it works

Answer 2

mass spectrometer
molecules in the sample are bombarded with electrons which remove an electron from the molecule to for a molecular ion

Question 3

to find the relative molecular mass of a compound you look at

Answer 3

the molecular ion peak

Question 4

what is the molecular ion peak

Answer 4

this is the peak with the highest mass/charge (m/z) value

Question 5

what is the mass/charge value of the molecular ion peak

Answer 5

the molecular mass

Question 6

what can cause fragments of molecular ions

Answer 6

bombarding electrons to the molecular ions and ,, break up and cause fragments

Question 7

fragmentation patterns can be used to

Answer 7

identify molecules and their structure

Question 8

mass spec is used to

Answer 8

differentiate between similar molecules

Question 9

what can infrared radiation do to bonds

Answer 9

IR radiation absorbed by covalent bond and increase vibrational energy

Question 10

bonds between diff atoms do what w diff frequencies of IR radiation

Answer 10

absorb diff different frequencies

Question 11

IR radiation can show if

Answer 11

a reaction has happened by change in functional groups