ACS STUDY GUIDE EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED | 2026/2027 LATEST UPDATE |
GRADED A+
Energy (decreases/increases) with increasing wavelength? - ANSWER decreases
Energy (decreases/increases) with increasing frequency? - ANSWER increases
The energy gaps between levels (decrease/increase) as the energy levels increase (n=1 to n=2 to n=3,
etc.) - ANSWER decreases
The O-Si-O bond angles in SiO₂ (quartz) are closest to... - ANSWER 110°
A molecule with 0 lone pairs and 2 bonding electron pairs would be? - ANSWER linear
A molecule with 1 lone pair and 2 bonding electron pairs would be? - ANSWER bent
A molecule with 3 bonding electron pairs and 1 lone pair would have what VSEPR shape? - ANSWER
Trigonal pyramidal
A molecule with 4 bonding electron pairs and 1 lone pair of electrons would have what VSEPR
shape? - ANSWER Seesaw
A molecule of 6 bonding electron pairs would have what shape? - ANSWER Octahedral
Difference between molecular shape and geometry? - ANSWER Shape refers to the orientation of
atoms while geometry accounts for both atoms and electron orientations.
A molecule of 3 bonding electron pairs and 2 lone pairs of electrons would have what shape? -
ANSWER T shaped
A molecule with 5 bonding electron pairs and 1 lone pair would have what shape? - ANSWER Square
pyramidal
, A molecule with 4 bonding electron pairs and 2 lone pairs would have what shape? - ANSWER Square
planar
A molecule with 5 bonding electron pairs would have what shape? - ANSWER Trigonal bipyramidal
A molecule with 4 bonding electron pairs would have what shape? - ANSWER Tetrahedral
A molecule with 3 bonding electron pairs would have what shape? - ANSWER Trigonal planar
Triple bonds have ___ sigma bonds and ___ pi bonds. - ANSWER 1 sigma, 2 pi
Double bonds have ___ sigma bonds and ___ pi bonds. - ANSWER 1 sigma, 1 pi
Single bonds have ___ sigma bonds and ___ pi bonds. - ANSWER 1 sigma, 0 pi
Resonance structures describe molecules that ___ - ANSWER have multiple electron dot formulas
Name 3 instances when the octet rule can be broken - ANSWER ¹Excess of electrons in Lewis Dot
diagram, ²Special indstance e.g. Sulfur, ³Rare Gas
Four equivalent, single, covalent bonds by carbon in its compounds that resemble methane, CH₄ is a
result of _____ - ANSWER Hybridization
For simple cubic, 2r= - ANSWER s
For body centered cubic, 4r= - ANSWER √3 · s
For face centered cubic, 4r= - ANSWER √2 · s
What factor affects the vapor pressure of a liquid? - ANSWER Temperature
COMPLETE SOLUTIONS VERIFIED | 2026/2027 LATEST UPDATE |
GRADED A+
Energy (decreases/increases) with increasing wavelength? - ANSWER decreases
Energy (decreases/increases) with increasing frequency? - ANSWER increases
The energy gaps between levels (decrease/increase) as the energy levels increase (n=1 to n=2 to n=3,
etc.) - ANSWER decreases
The O-Si-O bond angles in SiO₂ (quartz) are closest to... - ANSWER 110°
A molecule with 0 lone pairs and 2 bonding electron pairs would be? - ANSWER linear
A molecule with 1 lone pair and 2 bonding electron pairs would be? - ANSWER bent
A molecule with 3 bonding electron pairs and 1 lone pair would have what VSEPR shape? - ANSWER
Trigonal pyramidal
A molecule with 4 bonding electron pairs and 1 lone pair of electrons would have what VSEPR
shape? - ANSWER Seesaw
A molecule of 6 bonding electron pairs would have what shape? - ANSWER Octahedral
Difference between molecular shape and geometry? - ANSWER Shape refers to the orientation of
atoms while geometry accounts for both atoms and electron orientations.
A molecule of 3 bonding electron pairs and 2 lone pairs of electrons would have what shape? -
ANSWER T shaped
A molecule with 5 bonding electron pairs and 1 lone pair would have what shape? - ANSWER Square
pyramidal
, A molecule with 4 bonding electron pairs and 2 lone pairs would have what shape? - ANSWER Square
planar
A molecule with 5 bonding electron pairs would have what shape? - ANSWER Trigonal bipyramidal
A molecule with 4 bonding electron pairs would have what shape? - ANSWER Tetrahedral
A molecule with 3 bonding electron pairs would have what shape? - ANSWER Trigonal planar
Triple bonds have ___ sigma bonds and ___ pi bonds. - ANSWER 1 sigma, 2 pi
Double bonds have ___ sigma bonds and ___ pi bonds. - ANSWER 1 sigma, 1 pi
Single bonds have ___ sigma bonds and ___ pi bonds. - ANSWER 1 sigma, 0 pi
Resonance structures describe molecules that ___ - ANSWER have multiple electron dot formulas
Name 3 instances when the octet rule can be broken - ANSWER ¹Excess of electrons in Lewis Dot
diagram, ²Special indstance e.g. Sulfur, ³Rare Gas
Four equivalent, single, covalent bonds by carbon in its compounds that resemble methane, CH₄ is a
result of _____ - ANSWER Hybridization
For simple cubic, 2r= - ANSWER s
For body centered cubic, 4r= - ANSWER √3 · s
For face centered cubic, 4r= - ANSWER √2 · s
What factor affects the vapor pressure of a liquid? - ANSWER Temperature
