OCHEM Exam 1 Questions and Answers Fully Solved Latest Update 2025-2026
sp bond angle and geometry - Answers 180, linear
sp2 bond angle and geometry - Answers 120, trigonal planar (no lone pairs) or bent (1 lone pair)
sp3 bond angle and geometry - Answers 109.5, tetrahedral (no lone pairs) or trigonal
pyrimimidal (1 lone pair)
nonpolar covalent bond - Answers equal sharing of electrons, <0.5 different in electronegativity
polar covalent bond - Answers unequal sharing of electrons, 0.5-1.7 difference in
electronegativity
aufbau principle - Answers states that each electron occupies the lowest energy orbital
available
pauli exclusion principle - Answers states that a maximum of two electrons can occupy a single
atomic orbital but only if the electrons have opposite spins
hund's rule - Answers states that single electrons with the same spin must occupy each equal-
energy orbital before additional electrons with opposite spins can occupy the same orbitals
valence bond theory - Answers atoms share electrons when atomic orbitals overlap
molecular orbital theory (MO theory) - Answers the description of molecular structure in which
electrons occupy orbitals that spread throughout a molecule
red in electrostatic potential map - Answers has the most negative electrostatic potential;
attracts positive charge
green in electrostatic potential map - Answers nuetral
blue in electrostatic potential map - Answers has the most positive electrostatic potential;
attracts negative charge
dipole-dipole interactions - Answers attractive forces that act between polar molecules
hydrogen bonding - Answers attractive force between an H bonded to an electronegative atom
(N,O,F) and a lone pair on another electronegative atom
dispersion forces (London dispersion forces) - Answers dispersion is an intermolecular
attraction force that exists between all molecules
factors that affect boiling point - Answers 1. intermolecular forces
2. surface area
sp bond angle and geometry - Answers 180, linear
sp2 bond angle and geometry - Answers 120, trigonal planar (no lone pairs) or bent (1 lone pair)
sp3 bond angle and geometry - Answers 109.5, tetrahedral (no lone pairs) or trigonal
pyrimimidal (1 lone pair)
nonpolar covalent bond - Answers equal sharing of electrons, <0.5 different in electronegativity
polar covalent bond - Answers unequal sharing of electrons, 0.5-1.7 difference in
electronegativity
aufbau principle - Answers states that each electron occupies the lowest energy orbital
available
pauli exclusion principle - Answers states that a maximum of two electrons can occupy a single
atomic orbital but only if the electrons have opposite spins
hund's rule - Answers states that single electrons with the same spin must occupy each equal-
energy orbital before additional electrons with opposite spins can occupy the same orbitals
valence bond theory - Answers atoms share electrons when atomic orbitals overlap
molecular orbital theory (MO theory) - Answers the description of molecular structure in which
electrons occupy orbitals that spread throughout a molecule
red in electrostatic potential map - Answers has the most negative electrostatic potential;
attracts positive charge
green in electrostatic potential map - Answers nuetral
blue in electrostatic potential map - Answers has the most positive electrostatic potential;
attracts negative charge
dipole-dipole interactions - Answers attractive forces that act between polar molecules
hydrogen bonding - Answers attractive force between an H bonded to an electronegative atom
(N,O,F) and a lone pair on another electronegative atom
dispersion forces (London dispersion forces) - Answers dispersion is an intermolecular
attraction force that exists between all molecules
factors that affect boiling point - Answers 1. intermolecular forces
2. surface area
