4.7 - Analytical techniques

Question 1

What does mass spectrometry do?

Answer 1

detect mass to charge ratio of molecular ion, giving molecular mass of a compound

Question 2

How do covalent bonds change after absorbing IR? What does the amount this happens depend on?

Answer 2

bend/stretch more
depends on: mass of atoms, strength of bond (i.e. lighter and stronger = faster vibration)

Question 3

Uses of mass and IR spec

Answer 3

mass spec: drug testing
IR spec: detecting pollutants, breathalysers

Question 4

What does IR radiation causes covalent bonds to do?

Answer 4

vibrate more and absorb energy

Question 5

Describe what is linked to global warming

Answer 5

absorption of IR radiation by atmospheric gases containing C=O, O–H and C–H bonds (e.g. CO2, H2O and CH4)