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Question 1

for the vibrational spectrum, how many peaks do we get per vibrational mode?

Answer 1

1

Question 2

what are the degrees of freedom

Answer 2

different ways for a molecule to move around

Question 3

what are the three different ways a molecule can move around in space

Answer 3

translational, rotational, vibration

Question 4

how many degrees of freedom does translational motion have?

Answer 4

3 (x,y,z)

Question 5

what are the forms of rotational motion and what are the degrees of freedom for each

Answer 5

linear rotation has 2 DF and nonlinear rotation has 3 DF

Question 6

what are the forms of vibrational degrees of freedom?

Answer 6

linear: 3N-5 and nonlinear: 3N-6

Question 7

according to rotational spectroscopy, which molecules will give a peak?

Answer 7

molecules that are rotational active and go up/down one transition state

Question 8

why is N2 IR inactive

Answer 8

it has no dipole moment that changes

Question 9

why is C≡O IR active

Answer 9

it has a dipole moment that gets larger when it stretches