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MCAT Chemical and Physical Foundations of Biological Systems Flashcards: 4e Mass Spectrometry Atomic Identification

Study 4e Mass Spectrometry Atomic Identification in MCAT Chemical and Physical Foundations of Biological Systems with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What is the key difference between the molecular ion peak and a fragment peak?

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ANSWER

M+M^+ is intact molecule; fragments are smaller ions from cleavage. Molecular ion corresponds to the whole molecule, while fragments result from bond breakage during ionization.

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MCAT Chemical and Physical Foundations of Biological Systems: Foundational Concepts

You are hereMass Spectrometry and Atomic Identification (4E)25 cards

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What this deck covers

This deck focuses on 4e Mass Spectrometry Atomic Identification, giving you a quick way to review the definitions, rules, and examples that matter most for MCAT Chemical and Physical Foundations of Biological Systems.

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Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 50Practice questions for this set
An analytical lab uses a mass spectrometer to identify an unknown compound. The instrument detects ions, and neutral species are not observed. After a change in ion source settings, the total ion signal decreases substantially, but the m/zm/z positions of the remaining peaks are unchanged. The principle involved is that m/zm/z is determined by ion mass and charge, while signal intensity depends on the number of ions detected. Which conclusion about the ionization process is most consistent with these results? (Constants: e=1.60×10−19 Ce=1.60\times10^{-19}\ \text{C}.)
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