The intensity of an absorption band is always proportional to which of the following factor?

• Atomic population

• Molecular population of the initial state

• Molecular population of the final state

• Temperature

On which factors the vibrational stretching frequency of diatomic molecule depend?

• Force constant

• Atomic population

• Temperature

• Magnetic field

The vibrations, without a center of symmetry are active in which of the following region?

• Infrared but inactive in Raman

• Raman but inactive in IR

• Raman and IR

• Inactive in both Raman and IR

The infrared spectrum was obtained from a compound and showed absorptions at 2100 cm^-1,
1700 cm^-1, and 1200 cm^-1.  Identify the compound.

• CH₃COOCH₃
• C₆H₅COOH
• CH₂=CHCH₂OH
• CH≡CCH₂CO₂CH₃

A molecule absorbs IR at a wavenumber of 1720 cm^-1.  Which functional group could account for this absorption.
I. aldehydes
II. esters
III. ethers

• I only
• I and II 
• I, II and III 
• none of the above

What part of the atom or molecule does infrared radiation affect

• the nucleus
• the electrons
• the  bonds
• the charge

The independent variable on an IR spectra is 

• wave length 
• wave number
• frequency squared
• transmission

The dependent variable on an IR spectra is 

• wave length 
• wave number
• frequency
• transmission

The greater the polarity of a bond the_______________its IR absorption

• weaker
• stronger
• more charged
• smaller the wavenumber

______________ is the energy that can travel through space in the form of waves. 

• telescopes
• electromagnetic spectrum
• observatory

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-4