AQA A Level Chemistry - TOF-MS (Qualitative)

What ratio does the mass spectrometer detect?

• mass of main radical

• mass of molecular ion

• charge to mass ratio

• mass to charge ratio

In Mass spectrometry molecules are bombarded with high energy

• Protons

• Neutrons

• X-ray beams

• Electrons

What do the peaks on the mass spectrum represent?

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

Which element does this mass spectrum most likely represent?

• neon
• scandium
• boron
• sodium

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
• 84
• 86
• 4

What do you expect the molar mass to be for this element?

• 91.4 g/mol
• 90.0 g/mol
• 4 g/mol
• 50. g/mol

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

• 98
• 7
• 100
• 95.9 g/mol

A sample of pure chlorine gas is analyzed in the MS. Which of the following is a correct interpretation?

• Chlorine has an isotope with a mass of 70 amu
• Chlorine has three known isotopes
• Chlorine is diatomic
• Chlorine is highly reactive

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

• ³⁵Cl
• ³⁷Cl
• ⁷⁰Cl
• ⁷²Cl