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Chem 115 Exam 3 Questions and Correct
Answers
covalent bond Ans: can be formed when the orbitals of two atoms
overlap and are filled with pairs of electrons
greater orbital overlap Ans: stronger and more stable bond
linear Ans: two electron groups (linear) 180 degrees
trigonal planar Ans: three electron groups (trigonal planar or bent)
120 degrees
tetrahedral Ans: four electron groups (tetrahedral, trigonal
pyramidal, or bent) 109.5 degrees
trigonal bipyramidal Ans: five electron groups (trigonal
bipyramidal, seesaw, t-shaped, or linear)
octahedral Ans: six electron groups (octahedral, square pyramidal,
square planar)
double bonds Ans: require one p orbital from each atom
triple bonds Ans: require two p orbitals from each atom
hybridization Ans: can be determined directly from VSEPR theory
(number of electron groups)
two electron groups Ans: sp hybridization
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three electron groups Ans: sp2 hybridization
four electron groups Ans: sp3 hybridization
hybrid orbitals Ans: form when atomic orbitals in the valence shell
of a central atom combine, determined by the number of electrons
in the valence shell
multiple bonds Ans: use electrons in p orbitals to form pi bonds
which reduces the hybridization of the sigma bond
alkanes Ans: a hydrocarbon containing only single covalent bonds
gas Ans: 1-4 carbons
liquid Ans: 5-12 carbons
oil Ans: 14-20 carbons
solid Ans: >20 carbons
isomer Ans: same molecular formula, different bond structure
naming organic molecules Ans: molecules with the same number
of carbon atoms in a chain share the same parent name
meth- Ans: 1 carbon
eth- Ans: 2 carbons
prop- Ans: 3 carbons
but- Ans: 4 carbons
© 2025 All rights reserved
Chem 115 Exam 3 Questions and Correct
Answers
covalent bond Ans: can be formed when the orbitals of two atoms
overlap and are filled with pairs of electrons
greater orbital overlap Ans: stronger and more stable bond
linear Ans: two electron groups (linear) 180 degrees
trigonal planar Ans: three electron groups (trigonal planar or bent)
120 degrees
tetrahedral Ans: four electron groups (tetrahedral, trigonal
pyramidal, or bent) 109.5 degrees
trigonal bipyramidal Ans: five electron groups (trigonal
bipyramidal, seesaw, t-shaped, or linear)
octahedral Ans: six electron groups (octahedral, square pyramidal,
square planar)
double bonds Ans: require one p orbital from each atom
triple bonds Ans: require two p orbitals from each atom
hybridization Ans: can be determined directly from VSEPR theory
(number of electron groups)
two electron groups Ans: sp hybridization
© 2025 All rights reserved
, 2 | Page
three electron groups Ans: sp2 hybridization
four electron groups Ans: sp3 hybridization
hybrid orbitals Ans: form when atomic orbitals in the valence shell
of a central atom combine, determined by the number of electrons
in the valence shell
multiple bonds Ans: use electrons in p orbitals to form pi bonds
which reduces the hybridization of the sigma bond
alkanes Ans: a hydrocarbon containing only single covalent bonds
gas Ans: 1-4 carbons
liquid Ans: 5-12 carbons
oil Ans: 14-20 carbons
solid Ans: >20 carbons
isomer Ans: same molecular formula, different bond structure
naming organic molecules Ans: molecules with the same number
of carbon atoms in a chain share the same parent name
meth- Ans: 1 carbon
eth- Ans: 2 carbons
prop- Ans: 3 carbons
but- Ans: 4 carbons
© 2025 All rights reserved
