infrared spectroscopy

Question 1

how do greenhouse gases absorb infrared radiation?

Answer 1

due to vibration of covalent bonds

Question 2

what is infrared radiation?

Answer 2

electromagnetic radiation which is absorbed by greenhouse gases and re emitted back to earth

Question 3

what evidence is there for infrared radiation?

Answer 3

increase in temperature and carbon dioxide

Question 4

what does infrared radiation do?

Answer 4

causes covalent bonds to vibrate more and absorb energy

Question 5

how would you use an infrared spectrum to identify an alcohol?

Answer 5

absorption peak of narrow O-H bond

Question 6

how would you use an infrared spectrum to identify an aldehyde or ketone?

Answer 6

absorption peak of C=O bond

Question 7

how would you use an infrared spectrum to identify a carboxylic acid?

Answer 7

absorption peak of C=O bond and broad O-H bond

Question 8

give two examples of uses of infrared spectroscopy

Answer 8

breathalysers - oxidise ethanol and measures the intensity of a C-H peak

monitoring air pollution gases - testing CO/NO levels

Question 9

why is carbon dioxide more of a concern than methane?

Answer 9

because C=O bonds absorb more energy

Question 10

name two factors that affect the contribution of a greenhouse gas to global warming

Answer 10

the energy absorbed
the concentration of greenhouse gases

Question 11

how would a mass spectrum show the presence of an element

Answer 11

peaks of m/z values would give the relative atomic mass when the mean is calculated