Welcome to the Quiz!
This quiz contains 9 questions from a mix of 1 subtopics.
What is the primary purpose of bombarding vaporised sample molecules with electrons in mass spectrometry?
to detect the separated ions
to separate the ions based on their mass-to-charge ratio
to produce charged fragments
to create a mass spectrum
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What causes the M+1 peak in a mass spectrum?
molecules containing a deuterium isotope
molecules containing a carbon-12 isotope
molecules containing a carbon-13 isotope
molecules containing a carbon-14 isotope
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What does a peak at m/z 29 in a mass spectrum suggest?
the presence of a CH3CH2+ fragment
the presence of a CH3(CH2)3+ fragment
the presence of a CH3(CH2)2+ fragment
the presence of a CH3+ fragment
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How can mass spectrometry distinguish between closely related molecules with identical molecular formulas?
by measuring their precise m/z values
by examining their unique fragmentation patterns
by comparing their molecular ion peaks
by matching their spectra to a computer database
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In mass spectrometry, what happens to the molecular ions after they are produced by bombarding the gaseous molecules with an electron beam?
they are vaporised, turning into a gas
some of them break apart into smaller fragment ions
they are detected to create a mass spectrum
they are deflected through an electric field
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What does the m/z value of the M peak in a mass spectrum reveal about the compound?
its isotopic composition
its fragmentation pattern
its relative molecular mass (Mr)
its structural formula
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What causes the [M+2] peak in a mass spectrum of an organic compound containing chlorine?
molecules containing both 35Cl and 37Cl isotope atoms
molecules containing a 35Cl isotope atom
the [M+2] peak is not related to the presence of chlorine
molecules containing a 37Cl isotope atom
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How can the fragmentation pattern in a mass spectrum help in identifying a molecule's structure?
the fragmentation pattern is not related to the molecule's structure
the fragmentation pattern only provides information about the molecular formula
the m/z values of the peaks can be matched to known fragments to deduce the structural formula
the fragmentation pattern directly reveals the structural formula
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What is the term for the breaking apart of molecular ions into smaller fragment ions?
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