Mass spec

Question 1

ions accelerated by

Answer 1

an attraction to an electrical field

Question 2

abundance is detected by

Answer 2

size of current flowing through the detector

Question 3

detected by

Answer 3

gaining electrons

Question 4

Explain why the value you have calculated is slightly different from the relative
atomic mass given in the Periodic Table

Answer 4

The Ar in the Periodic table takes account of the other isotopes

Question 5

Sometimes the mass spectrum of Kr has a very small peak with an m/z value of 42.
Explain the occurrence of this peak

Answer 5

(Beam of electrons from) an electron gun / high speed / high energy electrons
1
Knocks out electron(s) (to form a positive ion

Question 6

when talking about how atoms are ionised

Answer 6

use electron impact

Question 7

abundance is determined by

Answer 7

detector - current related to abundance

Question 8

deflected the most

Answer 8

look at the peak with the lowest mz ( reason = lowest mass)

Question 9

Explain how this current is generated

Answer 9

Electron(s) transferred at the detector
From detector to the (+) ion

Question 10

different chemical properties

Answer 10

they don’t have same electron configuration

Question 11

calculating mass when given the masses of p,n,e

Answer 11

add neutron and electron

Question 12

second ionisation higher than first because

Answer 12

electron being removed is closer to nucleus so more energy is needed

Question 13

calculating relative abundance when give RAM

Answer 13

use x and y and simultaneous equations to find abundance

Question 14

why is a noble gas unreactive

Answer 14

full outer shell of electrons

Question 15

when describing how the molecules are ionised using electrospray ionisation

Answer 15

say Each molecule/particle gains a proton