EL1b - Mass Spectrometry and Nuclear Fusion

Question 1

1 mass unit is defined as….

Answer 1

1/12 the mass of one Carbon 12 atom

Question 2

What is the formula for relative atomic mass?

Answer 2

(% abundance x mass number) + (% abundance x mass number) / 100

Question 3

What are the 5 stages of mass spectrometry?

Answer 3

Vaporisation, Ionisation, Acceleration, Deflection, Detection.

Question 4

Equation for ionisation in a mass spectrometer?

Answer 4

X –> X+ + e-

Question 5

If all the ions are travelling at the same velocity and carry the same charge, the amount of deflection in a magnetic field depends upon…

Answer 5

the mass of the ion

Question 6

For a given magnetic field, only ions with a particular _________ are deflected enough to reach the detector.

Answer 6

Mass to Charge ratio

m/z value

Question 7

Ions that reach the detector cause electrons to be released in an ….

Answer 7

Ion-current detector

Question 8

What do you substitute % abundance as in an equation to find their value?

Answer 8

x

100-x

Question 9

Nuclear fusion reactions involve ….

Answer 9

Smaller nuclei joining together to make larger ones

Question 10

Why is extremely high energy needed for nuclear fusion?

Answer 10

To overcome the massive repulsion between two positive nuclei

Question 11

Why can fusion happen naturally inside stars?

Answer 11

Nuclei have such high speed and kinetic energy that they can overcome the repulsion and fuse together