Organic Chemistry MCAT Practice Exam

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Sharpen your skills for the Organic Chemistry MCAT Exam. Use flashcards and multiple choice questions with detailed explanations to enhance your proficiency and confidence. Ace your exam!

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In a gas chromatogram, what does a peak represent?

  1. The time of elution only.

  2. The number of compounds present.

  3. The concentration of the entire mixture.

  4. The temperature of the sample.

The correct answer is: The number of compounds present.

In a gas chromatogram, a peak represents a specific component of the mixture that has been separated during the chromatographic process. The area under each peak is directly proportional to the amount of that particular compound present in the sample. Therefore, when analyzing a gas chromatogram, the number of distinct peaks corresponds to the number of different compounds that have been effectively separated and detected in the mixture. This distinction allows chemists to identify and quantify the components present in complex mixtures, making the peak a crucial aspect of analysis in gas chromatography. Each peak corresponds to a unique compound, and its size reflects the concentration of that compound in the sample.

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