A level Edexcel Chemistry Topic 7 -
Modern Analytical Techniques I Exam
Questions and Answers
What does the number of peaks on a mass spectrum tell us? -
Answer>>How many different isotopes are present
What does the peaks at each m/z value indicate to us on a mass
spectrum? - Answer>>Indicates the relative isotopic mass of an
isotope
What does the height of each peak on a mass spectrum tell us? -
Answer>>Relative abundance of each isotope
What is the peak with the highest height called? -
Answer>>Base Peak
What is the peak which corresponds to the Mr of a compound
called? - Answer>>Molecular Ion Peak
What is the name given to the splitting of organic molecules in
mass spectrometry? - Answer>>Fragmentation
Which HC ions could give rise to peaks at: 15m/z, 29m/z, 43 m/z
and 58m/z? - Answer>>CH₃⁺, C₂H₅⁺, C₃H₇⁺, C₄H₉⁺
Which ions containing an O atom would give rise to peaks at:
17m/z, 28m/z, 31m/z, 43m/z and 45 m/z - Answer>>OH⁺, CO⁺,
CH₂OH⁺, CH₃CO⁺ and COOH⁺/CH₃CHOH⁺
Two compounds, A and B, have the molecular formula C₃H₆O. A's
mass spectrum has a base peak at 29m/z, B at 43m/z. Identify
the names of each compound - Answer>>A = Propanal and B =
Propanone
Modern Analytical Techniques I Exam
Questions and Answers
What does the number of peaks on a mass spectrum tell us? -
Answer>>How many different isotopes are present
What does the peaks at each m/z value indicate to us on a mass
spectrum? - Answer>>Indicates the relative isotopic mass of an
isotope
What does the height of each peak on a mass spectrum tell us? -
Answer>>Relative abundance of each isotope
What is the peak with the highest height called? -
Answer>>Base Peak
What is the peak which corresponds to the Mr of a compound
called? - Answer>>Molecular Ion Peak
What is the name given to the splitting of organic molecules in
mass spectrometry? - Answer>>Fragmentation
Which HC ions could give rise to peaks at: 15m/z, 29m/z, 43 m/z
and 58m/z? - Answer>>CH₃⁺, C₂H₅⁺, C₃H₇⁺, C₄H₉⁺
Which ions containing an O atom would give rise to peaks at:
17m/z, 28m/z, 31m/z, 43m/z and 45 m/z - Answer>>OH⁺, CO⁺,
CH₂OH⁺, CH₃CO⁺ and COOH⁺/CH₃CHOH⁺
Two compounds, A and B, have the molecular formula C₃H₆O. A's
mass spectrum has a base peak at 29m/z, B at 43m/z. Identify
the names of each compound - Answer>>A = Propanal and B =
Propanone
