topic 7: modern analytical techniques

Question 1

where is the molecular ion found on a mass spectrum

Answer 1

tall peak at the right of the spectrum

Question 2

what ion typically has a mass of 15

Answer 2

CH3+

Question 3

what ion typically has a mass of 29

Answer 3

C2H5+

Question 4

what ion typically has a mass of 17

Answer 4

OH+

Question 5

how can you determine between two different compounds with the same atoms

Answer 5

they produce different fragments in a mass spectrometer

Question 6

what causes the presence of the M+ peak

Answer 6

the presence of a carbon 13 isotope

Question 7

explain how infrared spectroscopy works

Answer 7

beam of IR radiation passes through chemical. different covalent bonds absorb different frequences which can be recorded

Question 8

explain how infrared spectroscopy can be used to observe reaction progress in organic chemistry

Answer 8

product will have different functional group to reactant so different group will be present in spectra