18 Questions
What occurs when two atomic orbitals combine in phase to form a molecular orbital?
Constructive interference
What is the shape of the molecular orbital formed by the overlap of two 2px atomic orbitals?
π (pi) molecular orbital
In a molecular orbital energy diagram, which molecular orbital has the highest energy in a > 14 electron system?
σ*2pz
What is the term used to describe molecular orbitals that have the same sign of the wave function when moving equal distances in opposite directions from the center of the MO?
Gerade
What type of interference occurs when two atomic orbitals combine out of phase to form a molecular orbital?
Destructive interference
What is the shape of the molecular orbital formed by the overlap of two 1s atomic orbitals?
σ (sigma) molecular orbital
What is the result of combining two atomic orbitals in the same phase?
Constructive interference
What is the characteristic of antibonding molecular orbitals in terms of energy?
Higher in energy than atomic orbitals
What is the shape of molecular orbitals formed by s-orbitals?
Symmetrical around the bond axis
What is the effect of destructive interference on electron density in the internuclear region?
Electron density decreases
What is the difference between 𝞂 and 𝛑 molecular orbitals?
𝞂 is symmetrical, 𝛑 is asymmetrical
What is the equation for forming a bonding molecular orbital?
𝛹BMO = 𝛹A + 𝛹B
What is the primary reason for the need of resonance theory in molecular structure representation?
To account for the delocalization of π electrons in certain molecules
What is a characteristic of resonance hybrid structures?
They have bond lengths that are intermediate to those of the resonance structures
What is a condition for resonance to occur in a molecule?
The molecule must have a planar structure
What is the role of the most stable resonance structure in contributing to the resonance hybrid?
It contributes maximum towards the resonance hybrid
What is true about the energy of resonance structures and the resonance hybrid?
The resonance structures have similar or degenerate energy
What is the relationship between the bonding and nonbonding electron pairs in a resonance hybrid?
The number of bonding and nonbonding electron pairs are equal
Test your understanding of molecular orbital theory, including constructive and destructive interference, energy diagrams, and shapes of molecular orbitals in the H2 molecule.
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