Chapter 17

Question 1

Infrared spectroscopy

Answer 1

Certain bonds in a molecule absorb infra-red radiation at
characteristic frequencies causing the covalent bonds to
vibrate

Question 2

The ‘Greenhouse Effect’ of a given gas is
dependent on(3)

Answer 2

-its atmospheric concentration
-ability to absorb infrared radiation
-its residence time

Question 3

residence time.

Answer 3

Time a given gas stays in
atmosphere

Question 4

Concentrations of carbon dioxide in the atmosphere have risen
significantly in recent years due

Answer 4

to increasing burning of fossil fuels.

Question 5

infrared spectroscopy: uses

Answer 5

-modern breathalysers measure ethanol in the breath by analysis
-monitor gases causing air pollution

Question 6

parent ion/molecular ion

Answer 6

The peak with the
largest m/z, is = to the Mr

Question 7

equation for molecular ion formed

Answer 7

Molecular ion formed: M → [M]+. + e–

Question 8

fragmentation

Answer 8

When organic molecules are passed through a mass
spectrometer, it detects both the whole molecule and fragments of the molecule.

Question 9

the more stable the ion,

Answer 9

the greater the peak intensity

Question 10

fragmentation produces an

Answer 10

ion and a free radical.

Question 11

what is the ion responsible for

Answer 11

The ion is
responsible for the peak

Question 12

The Molecular ion fragments due to covalent bonds breaking: (equation)

Answer 12

[M]+. → X+ + Y