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 produce charged fragments
to separate the ions based on their mass-to-charge ratio
to create a mass spectrum
to detect the separated ions
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What causes the M+1 peak in a mass spectrum?
molecules containing a deuterium isotope
molecules containing a carbon-14 isotope
molecules containing a carbon-13 isotope
molecules containing a carbon-12 isotope
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What does a peak at m/z 29 in a mass spectrum suggest?
the presence of a CH3(CH2)3+ fragment
the presence of a CH3CH2+ fragment
the presence of a CH3(CH2)2+ fragment
the presence of a CH3+ fragment
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Which of the following is the accurate isotopic mass of 12C?
12.0000
15.9949
14.0031
1.0078
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How can mass spectrometry distinguish between closely related molecules with identical molecular formulas?
by comparing their molecular ion peaks
by measuring their precise m/z values
by matching their spectra to a computer database
by examining their unique fragmentation patterns
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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
they are detected to create a mass spectrum
they are deflected through an electric field
some of them break apart into smaller fragment ions
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What does the m/z value of the M peak in a mass spectrum reveal about the compound?
its structural formula
its fragmentation pattern
its relative molecular mass (Mr)
its isotopic composition
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How can the fragmentation pattern in a mass spectrum help in identifying a molecule's structure?
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
the fragmentation pattern only provides information about the molecular formula
the fragmentation pattern is not related to the molecule's structure
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What is the term for the breaking apart of molecular ions into smaller fragment ions?
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