Mass Spectrometry

What are the steps of operation in the mass spectrometer?

• Accelerate, Deflect, Ionize, Detect

• Deflect, Ionize, Accelerate, Detect

• Ionize, Accelerate, Deflect, Detect

• Detect, Accelerate, Deflect, Ionize

Which species would get deflected by the greatest degree in the mass spectrometer?

• ¹²C⁺
• ¹³C⁺
• ¹³C²⁺
• ¹⁴C⁺

What do the peaks on the mass spectrum represent?

• anions
• different isotopes
• atoms with differing numbers of electrons
• numbers of electrons

Who invented the mass spectrometer?

• Mikhail Tsvet

• Kary Mullis

• Francis Aston

• Jimmy Buffet

What do the heights of the peaks represent in the mass spectrum?

• number of isotopes
• relative abundance of each isotope
• average atomic mass
• charge:mass ratio

How many isotopes are shown in this mass spectrum?

• 1

• 5

• 84

• 4

How many isotopes of this element are shown in the mass spectrum?

• 98
• 7
• 100
• 95.9 g/mol

What is the average atomic mass for this element?

• 10 amu
• 10.8 amu
• 19.9 amu
• 11 amu

What kind of particles are used in mass spectrometry?

• Anions

• Cations

• Polyatomic ions

Based on the mass spectrum, which isotope of chlorine is most abundant?

• 68 m/z

• 70 m/z

• 74 m/z

• 72 m/z