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2. Why are the 'peaks' upside-down in an IR transmittance spectrum? A. IR spectrometers are conventionally used upside-down. B. The x-axis is in reciprocal units. C. Transmittance decreases when the sample absorbs more light. D. IR radiation has longer wavelengths than visible light. 3. Which of the following does NOT affect which IR frequencies a bond can absorb? A. Bond properties, such as length and strength. B. The vibrational modes available to the bond. C. Relative location of the bond to the IR source. D. The atoms connected by the bond. 4. What could a wide peak near 3300 cm-1 indicate? A. C-O stretching B. O-H or N-H stretching C. C=C stretching D. C=O stretching

          2. Why are the 'peaks' upside-down in an IR transmittance spectrum?
   A. IR spectrometers are conventionally used upside-down.
   B. The x-axis is in reciprocal units.
   C. Transmittance decreases when the sample absorbs more light.
   D. IR radiation has longer wavelengths than visible light.

3. Which of the following does NOT affect which IR frequencies a bond can absorb?
   A. Bond properties, such as length and strength.
   B. The vibrational modes available to the bond.
   C. Relative location of the bond to the IR source.
   D. The atoms connected by the bond.

4. What could a wide peak near 3300 cm-1 indicate?
   A. C-O stretching
   B. O-H or N-H stretching
   C. C=C stretching
   D. C=O stretching

Added by Douglas S.

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