14 Questions
Which of the following events occurs when a molecule transitions from a higher energy level to a lower energy level?
Emission of radiation
What is the primary cause of electronic excitation in a molecule?
Absorption of UV-vis photons
What is the name of the molecular orbital that an electron is typically promoted from during electronic excitation?
HOMO
What is the name of the group of atoms in a molecule that absorbs light, whether or not a color is produced?
Chromophore
What is the term used to describe a transition from a higher energy level to a lower energy level without the emission of radiation?
Nonradiative decay
Which region of the electromagnetic spectrum is associated with electronic excitation of molecules?
Ultraviolet and visible
What is the primary requirement for a molecule to exhibit an electronic spectrum?
The molecule must have a chromophore
Which type of molecular orbital transition is typically involved in electronic excitation?
HOMO to LUMO
What is the primary energy range (in kJ/mol) associated with electronic excitation in molecules?
10^14 to 10^16 kJ/mol
What is the term used to describe the process of a molecule absorbing a photon of UV-visible light?
Absorption
What is the primary cause of the observed color in a molecule that absorbs visible light?
The molecule absorbs light of a specific wavelength
Which of the following transitions is not considered an electronic transition?
Vibrational transitions
Which of the following statements about electronic transitions is incorrect?
Electronic transitions are always accompanied by the emission of light
Which region of the electromagnetic spectrum has the highest energy associated with it?
Cosmic rays
Explore the origin of electronic spectra and the absorption of UV-vis photons by molecules leading to electronic excitation. Understand the concept of chromophores and the electronic transitions involving promotion of electrons from the HOMO to LUMO.
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