Infrared Spectroscopy Worksheet
Grade 12 Chemistry worksheet on Infrared Spectroscopy, covering principles, interpretation of spectra, and applications.
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Infrared Spectroscopy Worksheet
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Read each question carefully and provide detailed answers. Use your knowledge of Infrared (IR) Spectroscopy to analyze the given scenarios and interpret the data.
1. Which of the following functional groups typically shows a strong, broad absorption band around 3300 cm⁻¹ in an IR spectrum?
Carbonyl (C=O)
Alkene (C=C)
Hydroxyl (O-H)
Alkyne (C≡C)
2. The 'fingerprint region' in an IR spectrum is typically found in which wavenumber range?
4000-2500 cm⁻¹
2500-1500 cm⁻¹
1500-400 cm⁻¹
None of the above
3. Infrared spectroscopy works by measuring the absorption of infrared radiation by molecules, causing their covalent bonds to .
4. The intensity of an IR absorption band is related to the change in the bond's moment during vibration.
5. A strong absorption at approximately 1700 cm⁻¹ is characteristic of a functional group.
6. Explain the fundamental principle behind how Infrared (IR) spectroscopy can be used to identify functional groups in organic molecules.
7. All molecular vibrations are IR active.
True
False
8. The wavenumber of an IR absorption is directly proportional to the energy of the vibration.
True
False
9. A compound shows a strong absorption at 1710 cm⁻¹ and another absorption at 2950 cm⁻¹. Based on this information, what functional group(s) are likely present in the compound? Justify your answer.