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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?

fragmentation

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