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[ppm) 3.0820 3.06892 41207 41119 2.0377 ESE Dra

[ppm) 3.0820 3.06892 41207 41119 2.0377 ESE Dra

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Using mass spectrum and H+NMR, propose a compound containg C doubled bonded to O and C bonded to H (sp3)

 

### Nuclear Magnetic Resonance (NMR) Spectroscopy of Sample A #### Overview: The image presents an NMR spectrum for a chemical analysis of a sample labeled "Sample A." This type of analysis is utilized to determine the structure of organic compounds by observing hydrogen atoms' behavior in a magnetic field. #### Graph Explanation: - **X-Axis (ppm)**: Represents the chemical shift in parts per million (ppm), a scale that indicates the environment of hydrogen atoms in the molecule. The scale ranges from approximately 0 to 4 ppm. - **Y-Axis (Intensity in arbitrary units)**: Reflects the signal intensity, indicating the number of hydrogen atoms contributing to each signal. #### Peaks and Chemical Shifts: The spectrum highlights several distinct peaks indicative of different hydrogen environments: 1. **Peak at ~4.0777 ppm**: - This peak suggests the presence of hydrogen atoms in a unique chemical environment, possibly related to electronegative groups or other structural features. 2. **Peak at ~2.0093 ppm**: - Represents hydrogen atoms in a less shielded environment. This shift might be associated with hydrogen atoms adjacent to functional groups such as carbonyls or double bonds. 3. **Peak at ~1.3896 ppm**: - Generally indicates aliphatic hydrogen atoms, possibly in a typical alkane environment. #### Notes: This NMR analysis is a critical tool in organic chemistry, enabling researchers to deduce structural information about Sample A by interpreting the chemical shift and intensity of each peak.
Transcribed Image Text:### Nuclear Magnetic Resonance (NMR) Spectroscopy of Sample A #### Overview: The image presents an NMR spectrum for a chemical analysis of a sample labeled "Sample A." This type of analysis is utilized to determine the structure of organic compounds by observing hydrogen atoms' behavior in a magnetic field. #### Graph Explanation: - **X-Axis (ppm)**: Represents the chemical shift in parts per million (ppm), a scale that indicates the environment of hydrogen atoms in the molecule. The scale ranges from approximately 0 to 4 ppm. - **Y-Axis (Intensity in arbitrary units)**: Reflects the signal intensity, indicating the number of hydrogen atoms contributing to each signal. #### Peaks and Chemical Shifts: The spectrum highlights several distinct peaks indicative of different hydrogen environments: 1. **Peak at ~4.0777 ppm**: - This peak suggests the presence of hydrogen atoms in a unique chemical environment, possibly related to electronegative groups or other structural features. 2. **Peak at ~2.0093 ppm**: - Represents hydrogen atoms in a less shielded environment. This shift might be associated with hydrogen atoms adjacent to functional groups such as carbonyls or double bonds. 3. **Peak at ~1.3896 ppm**: - Generally indicates aliphatic hydrogen atoms, possibly in a typical alkane environment. #### Notes: This NMR analysis is a critical tool in organic chemistry, enabling researchers to deduce structural information about Sample A by interpreting the chemical shift and intensity of each peak.
**Mass Spectrum Analysis of Sample A** The image presents a mass spectrum for Sample A, which is a graphical representation of the distribution of ions by mass in a chemical sample. The spectrum is used to identify compounds through their mass-to-charge (m/z) ratios. **Graph Details:** - **Y-Axis (Relative Intensity):** Represents the abundance of ions detected, expressed as a percentage relative to the most intense peak (which is set to 100%). - **X-Axis (m/z):** Stands for mass-to-charge ratio of the ions. Ranges from 0 to 100 on this graph. - **Peaks:** Each line or peak on the graph corresponds to ions of a specific m/z value. The height of each peak indicates the relative intensity or abundance of these ions in the sample. **Key Observations:** - A significant peak with 100% intensity appears at approximately m/z 40, suggesting that this m/z value is the most abundant ion in the sample. - Several smaller peaks are present, indicating the presence of other ions with lower relative intensities across the m/z range. This mass spectrum provides valuable information for identifying the specific composition of Sample A and is a critical tool in analytical chemistry for substance identification. For additional chemical data, you can visit the NIST Chemistry WebBook: [https://webbook.nist.gov/chemistry/](https://webbook.nist.gov/chemistry/).
Transcribed Image Text:**Mass Spectrum Analysis of Sample A** The image presents a mass spectrum for Sample A, which is a graphical representation of the distribution of ions by mass in a chemical sample. The spectrum is used to identify compounds through their mass-to-charge (m/z) ratios. **Graph Details:** - **Y-Axis (Relative Intensity):** Represents the abundance of ions detected, expressed as a percentage relative to the most intense peak (which is set to 100%). - **X-Axis (m/z):** Stands for mass-to-charge ratio of the ions. Ranges from 0 to 100 on this graph. - **Peaks:** Each line or peak on the graph corresponds to ions of a specific m/z value. The height of each peak indicates the relative intensity or abundance of these ions in the sample. **Key Observations:** - A significant peak with 100% intensity appears at approximately m/z 40, suggesting that this m/z value is the most abundant ion in the sample. - Several smaller peaks are present, indicating the presence of other ions with lower relative intensities across the m/z range. This mass spectrum provides valuable information for identifying the specific composition of Sample A and is a critical tool in analytical chemistry for substance identification. For additional chemical data, you can visit the NIST Chemistry WebBook: [https://webbook.nist.gov/chemistry/](https://webbook.nist.gov/chemistry/).
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