Unit 3 - IR

Question 1

What does Imfrared Spectroscopy do?

Answer 1

Provides information on all functional groups

Question 2

How is wave number calculated?

Answer 2

1/ wavelength

Question 3

What does the wave number of the absorbed ligh reveal?

Answer 3

Which functional groups are present in the molecule

Question 4

How is vibration repeated to number of atoms?

Answer 4

Molecules with a greater number of atoms undergo more vibrations than molecules with fewer atoms

Question 5

What is the formula for the number of vibrations in a molecule?

Answer 5

3n - 6

Question 6

What leads to absorption of energy in IR?

Answer 6

Vibrations that change the dipole moment

Question 7

What are IR inactive dipoles?

Answer 7

Vibrations that do not change the dipole moment

Question 8

What is a greater intensity IR absorption associated with?

Answer 8

A greater change in the dipole

Question 9

Where is the fingerprint region?

Answer 9

The region that show unique patterns 1500 - 500