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9 Cards in this Set
- Front
- Back
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What happens when a molecule absorbs infrared radiation? |
It makes the covalent bond vibrate more in a stretching or bending motion. |
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What factors affect the amount of vibration of a bond? |
Bond strength, bond length, mass of each atom in the bond. |
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How does infrared spectroscopy work? |
Every bond has a unique vibration frequency. Bonds absorb radiation that has the same frequency as their frequency of vibration. Infrared radiation emerged from a sample is missing the frequencies that have been absorbed. |
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2 peaks that must be present to identify a substance as carboxylic acid. |
Very broad peak at 2500-3300 cm^-1 (OH group) Sharp peak at 1680-1750 cm^-1 (C=O group) |
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m/z value of CH3^+ |
15 |
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m/z value of OH^- |
17 |
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m/z value of C2H5^+ |
29 |
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m/z value of C3H7^+ |
43 |
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m/z value of C4H9^+ |
57 |
