AS.15 Analytical Techniques

Question 1

Infrared radiation

Answer 1

Causes bonds within molecule to vibrate more and absorb energy

Question 2

Mass spectrometer

Answer 2

Creates cations

Record their presence with m/z

Peak furthest to right is M+

Question 3

Fragmentation

Answer 3

Peaks caused by breaking of covalent bond

Question 4

Purification of organic liquids

Answer 4

1) separating funnel - least dense (usually organic) will lie on top and more dense on bottom

2) drying agents e.g. MgSO4 or CaCl4

3) re-distillation - once distilled, collect and distill again