Topic 7 : Modern Analytical techniques

Question 1

Fragmentation

Answer 1

Molecular ion breaks into smaller pieces

Question 2

How does a mass spectrometer turn a molecule +ve?

Answer 2

• Bombard it with high energy electrons

Question 3

Base peak

Answer 3

• peak with the greatest abundance

Question 4

Molecular ion peak

Answer 4

• Species formed from the molecule by the loss of one electron

Question 5

m/z ratio

Answer 5

m/1 (normal)
m/2 (halved)
m/3 (third)

Question 6

What causes the dips in the infra-red spectra?

Answer 6

Stretching of bonds