The Mass Spectrometer

Question 1

Stages of Mass Spectrometer

Answer 1

1) Electrospray ionisation
2) Acceleration
3) Ion drift
4) Detection

Question 2

Electrospray ionisation

Answer 2

Sample dissolved in polar solvent
Pushed through nozzle at high pressure
High voltage applied
Particles to lose an electron and separated from solvent
Leave gas made up of positive ions

Question 3

Acceleration

Answer 3

Positive ions accelerated by electric field
Electric field gives kinetic energy
Ions will lower mass/charge ratio are faster

Question 4

Ion drift

Answer 4

Leave electric field with constant speed and kinetic energy
Enter region with no kinetic field
Ions will lower mass/charge ratios will be drifting at higher speed

Question 5

Detection

Answer 5

Ions with lower mass/charge ratio travel at higher speeds
Reach detecter sooner
Detecter finds current created when ions hit and record how long they took to pass spectrometer

Question 6

Calculating relative atomic mass

Answer 6

Percent abundance x mass/charge on all of them
Add values together
Divide by 100%

Question 7

Standard enthalpy change equation

Answer 7

Q = mc(delta)T
q = heat lost or gained (J)
M = mass (g)
C = specific heat capacity (4.18J g-1 K-1)
delta T = change in temperature