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1. Sample preparation of infrared spectroscopy uses KBr as the blank because Kbr has 100% transmittance at the IR wavelength range. True False

1. Sample preparation of infrared spectroscopy uses KBr as the blank because Kbr has 100% transmittance at the IR wavelength range. True False

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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1. Sample preparation of infrared spectroscopy uses KBr as the blank because Kbr has 100% transmittance at the IR wavelength range. True False 2. The signals observed from a molecule of chloropropane will have a higher wavenumber than iodopropane. True False 3. Among all the possible vibrational modes, symmetric stretching will be IR inactive. True False 4. Infrared spectroscopic data is reported in wavenumber (cm1) against absorbance because they have a linear relationship. True False 5. A hygroscopic organic sample to be subjected to IR does not need to be kept dry because water molecules in the air will not affect the IR spectra. True False 6. The electromagnetic radiation that is emitted in infrared spectroscopy is not enough to excite electrons to an unoccupied molecular orbital. True False 7. A molecule that is "IR inactive" means that it does not produce any signal due to no vibration. True False
Transcribed Image Text:1. Sample preparation of infrared spectroscopy uses KBr as the blank because Kbr has 100% transmittance at the IR wavelength range. True False 2. The signals observed from a molecule of chloropropane will have a higher wavenumber than iodopropane. True False 3. Among all the possible vibrational modes, symmetric stretching will be IR inactive. True False 4. Infrared spectroscopic data is reported in wavenumber (cm1) against absorbance because they have a linear relationship. True False 5. A hygroscopic organic sample to be subjected to IR does not need to be kept dry because water molecules in the air will not affect the IR spectra. True False 6. The electromagnetic radiation that is emitted in infrared spectroscopy is not enough to excite electrons to an unoccupied molecular orbital. True False 7. A molecule that is "IR inactive" means that it does not produce any signal due to no vibration. True False
8. A strong signal in infrared spectroscopy indicates that a molecule matches the emitted electromagnetic radiation and reports a high transmittance. True False 9. The signals observed from the C-C bond in an alkene will report at a higher wavenumber than the C-C bond in an alkyne. True False 10. The electronegativity difference present in a dipole moment within a bond is directly proportional to the electromagnetic field produced. True False
Transcribed Image Text:8. A strong signal in infrared spectroscopy indicates that a molecule matches the emitted electromagnetic radiation and reports a high transmittance. True False 9. The signals observed from the C-C bond in an alkene will report at a higher wavenumber than the C-C bond in an alkyne. True False 10. The electronegativity difference present in a dipole moment within a bond is directly proportional to the electromagnetic field produced. True False
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