Quiz 4 - IR/HNMR

Question 1

Define Spectroscopy

Answer 1

Study of the interaction of electromagnetic radiation (light) with molecules

Question 2

Light travels in ________.

Answer 2

Waves

Question 3

Low energy = _____ frequency = ______ wavelength.

Answer 3

Low; long

Question 4

High energy = _____ frequency = _____ wavelength.

Answer 4

High; short

Question 5

Define Spectrum

Answer 5

A plot of the amount of light absorbed/transmitted vs. energy of the light

Question 6

Energy can be absorbed by molecules giving rise to excited states, which can include…

Answer 6

• Electronic excitation
• Vibration/rotation excitation
• Nuclear spin excitation

Question 7

Examples of Electronic Excitation includes?

Answer 7

• Ultraviolet

- Visible

Question 8

Examples of Vibration/Rotation Excitation includes?

Answer 8

• Infrared

- Molecular weight

Question 9

Examples of Nuclear Spin Excitation includes?

Answer 9

NMR

Question 10

The more polar the bond = the _____ intense the absorptions.

Answer 10

More

Question 11

The intensity of an absorption band also depends on…

Answer 11

The number of bonds responsible for the absorption

Question 12

Stronger bonds absorb at ________ wavenumbers; ________ “K”.

Answer 12

Higher; larger

Question 13

Stretches absorb at _______ wavenumber than bends; ________ “K”.

Answer 13

Higher; larger

Question 14

Bonds to H absorb at ________ wavenumber; ________ mass.

Answer 14

Higher; smaller

Question 15

Polar bonds have _______ intense absorptions; ________ %T.

Answer 15

More; smaller

Question 16

T/F An absorption band due to a particular functional group always appears in different general regions

Answer 16

False; always appears in the same general region