UV-Vis spectroscopy measures absorption of light in the range, used to study .

Answer: ultraviolet to visible (200-800 nm); electronic transitions, often in conjugated systems UV-Vis: electronic transitions (π → π, n → π, etc.). IR: bond vibrations. NMR: nuclear spin transitions in magnetic field.

A strong, broad IR absorption near 3300 cm⁻¹ is characteristic of

Answer: O-H or N-H stretch (hydrogen-bonded) H-bonded O-H (alcohols, carboxylic acids) gives broad absorbance 3200-3500 cm⁻¹. C=O is sharp, near 1700 cm⁻¹.

AP Chemistry · Topic 3.11

Spectroscopy and the Electromagnetic Spectrum Practice

Part of Properties of Substances and Mixtures.(SAP-8.A)

Practice questions

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Sample questions

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Sample 1difficulty 3/5
$UV-Vis spectroscopy measures absorption of light in the _______ range, used to study _______.$
- A
  $infrared; vibrations$
- B
  $ultraviolet to visible (~200-800 nm); electronic transitions, often in conjugated systems$
  check_circle
- C
  $radio; nuclear spin$
- D
  $X-ray; atoms$
Why
$UV-Vis: electronic transitions (π \to π*, n \to π*, etc.). IR: bond vibrations. NMR: nuclear spin transitions in magnetic field.$
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Sample 2difficulty 3/5
$A strong, broad IR absorption near 3300 cm⁻¹ is characteristic of$
- A
  $C=O stretch$
- B
  $O-H or N-H stretch (hydrogen-bonded)$
  check_circle
- C
  $Aromatic ring$
- D
  $C-C stretch$
Why
$H-bonded O-H (alcohols, carboxylic acids) gives broad absorbance ~3200-3500 cm⁻¹. C=O is sharp, near 1700 cm⁻¹.$
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