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This quiz contains 8 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 produce charged fragments
to create a mass spectrum
to separate the ions based on their mass-to-charge ratio
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What causes the M+1 peak in a mass spectrum?
molecules containing a carbon-13 isotope
molecules containing a deuterium isotope
molecules containing a carbon-12 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+ fragment
the presence of a CH3(CH2)2+ fragment
the presence of a CH3(CH2)3+ 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 matching their spectra to a computer database
by comparing their molecular ion peaks
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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 deflected through an electric field
some of them break apart into smaller fragment ions
they are vaporised, turning into a gas
they are detected to create a mass spectrum
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What does the m/z value of the M peak in a mass spectrum reveal about the compound?
its fragmentation pattern
its relative molecular mass (Mr)
its isotopic composition
its structural formula
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How can the fragmentation pattern in a mass spectrum help in identifying a molecule's structure?
the fragmentation pattern directly reveals the structural formula
the fragmentation pattern is not related to the molecule's structure
the m/z values of the peaks can be matched to known fragments to deduce the structural formula
the fragmentation pattern only provides information about the molecular formula
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What is the term for the breaking apart of molecular ions into smaller fragment ions?
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