Infrared spectrometry

Question 1

infrared radiation is where on the electromagnetic spectrum

Answer 1

before radio waves and after visible light, below red light (infra means below)

Question 2

the two possible effects of a molecule absorbing infrared radiation are

Answer 2

stretching and bending

Question 3

stretching occurs when

Answer 3

a bond absorbs infrared radiation and uses it to alter the length of the bond

Question 4

the transmittance value in an infrared spectrum represents

Answer 4

the amount of radiation absorbed at a particular wavenumber

Question 5

the wavenumber of an infrared absorption represents

Answer 5

the frequency of infrared radiation absorbed by a particular bond in a molecule

Question 6

the intensity of an infrared absorption describes

Answer 6

the amount of infrared radiation absorbed

Question 7

when a molecule absorbs infrared radiation, the amount of energy absorbed depends on: (3 items)

Answer 7

• the length of the bond
• the strength of the bond
• the mass of each atom involved in the bond

Question 8

the absorption of infrared radiation is linked to

Answer 8

the polarity of the molecule

Question 9

non-polar molecules can absorb infrared radiation: true of false?

Answer 9

false, they cannot

Question 10

when a compound s irradiated by infrared radiation, the bonds in the molecule absorbs radiation from

Answer 10

some parts of the spectrum but not from others

Question 11

the spectrum is normally shown with the vertical axis labelled

Answer 11

transmittance