AP Chemistry · Unit 2: Compound Structure and Properties
2.7 VSEPR and Hybridization
In short
You must use VSEPR theory, based on Coulombic repulsion, to predict the arrangement of electron pairs. Required molecular geometries include linear, trigonal planar, tetrahedral, trigonal pyramidal, bent, trigonal bipyramidal, seesaw, T-shaped, octahedral, square pyramidal, and square planar.
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What else do you need to know about VSEPR and Hybridization?
You must predict bond angles, relative bond energies (based on bond order), relative bond lengths (considering multiple bonds and atomic radius), dipole moments, and hybridization (sp, sp2, sp3) with ideal bond angles of 180°, 120°, and 109.5° respectively. The course includes the distinction between sigma and pi bonding, noting that sigma overlap is stronger and that pi bonds prevent rotation, leading to geometric isomers. Exclusions: An understanding of the derivation and depiction of hybrid orbitals will not be assessed. Hybridization involving d orbitals will not be assessed; when an atom has more than four pairs of electrons, you are only responsible for the shape of the resulting molecule. Molecular orbital theory (including MO diagrams, filling of MOs, and the distinction between bonding, nonbonding, and antibonding orbitals) will not be assessed.
How is VSEPR and Hybridization tested on the exam?
Assessed via Suggested Skill 6.C: Support a claim with evidence from representations or models at the particulate level. On the AP Exam, many students struggle to predict the correct molecular shape or bond angle based on VSEPR. Common mistakes include using the incorrect number of valence electrons, violating the octet rule, or confusing molecular geometry with bond angles. You must be able to predict and describe molecular shapes, bond angles, and polarities directly from Lewis structures.
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VSEPR and Hybridization: common questions
What do you need to know about VSEPR and Hybridization for AP Chemistry?
You must use VSEPR theory, based on Coulombic repulsion, to predict the arrangement of electron pairs. Required molecular geometries include linear, trigonal planar, tetrahedral, trigonal pyramidal, bent, trigonal bipyramidal, seesaw, T-shaped, octahedral, square pyramidal, and square planar.
How is VSEPR and Hybridization tested on the AP Chemistry exam?
Assessed via Suggested Skill 6.C: Support a claim with evidence from representations or models at the particulate level. On the AP Exam, many students struggle to predict the correct molecular shape or bond angle based on VSEPR.
Where does VSEPR and Hybridization fit in AP Chemistry?
VSEPR and Hybridization is topic 2.7 in Unit 2: Compound Structure and Properties of AP Chemistry.
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