CEM 141 EXAM 3 2026 GENERAL CHEMISTRY
FINAL REVISION QUESTIONS SOLUTIONS
COMPLETE SET
◉ What evidence supports the idea that electron energy levels in
atoms are quantized?
Answer: The existence of large, discrete jumps in successive
ionization energies.
◉ Metallic Bonding
Answer: A system where valence electrons are delocalized in a "sea"
of mobile electrons throughout a lattice of metal nuclei.
◉ What is the best explanation for why metals are ductile?
Answer: Valence electrons act as glue holding nuclei together when
they move relative to one another.
◉ Why is graphite able to conduct electricity while diamond is not?
Answer: Graphite has unhybridized p- orbitals forming a delocalized
pi bonding network for mobile electrons.
◉ What type of bonding is present in BN, the second hardest known
substance?
, Answer: A 3D network of covalent bonds
◉ Why is it impossible to predict the state of matter of a product (C)
simply from the states of the reactants (A+B)?
Answer: The state depends on the specific bonding and interactions
present within the product molecule.
◉ How does rotation differ between a carbon-carbon single bond
and a double bond?
Answer: Free rotation occurs around single bonds, while rotation is
restricted around double bonds.
◉ Between Cl2 and Ar, which is predicted to have the higher boiling
point?
Answer: Cl2
◉ The strength of London dispersion forces (LDFs) primarily
depends on the size of the ____.
Answer: electron cloud
◉ How many lone pairs of electrons are on the sulfur atom in SCl2?
Answer: 2 lone pairs
FINAL REVISION QUESTIONS SOLUTIONS
COMPLETE SET
◉ What evidence supports the idea that electron energy levels in
atoms are quantized?
Answer: The existence of large, discrete jumps in successive
ionization energies.
◉ Metallic Bonding
Answer: A system where valence electrons are delocalized in a "sea"
of mobile electrons throughout a lattice of metal nuclei.
◉ What is the best explanation for why metals are ductile?
Answer: Valence electrons act as glue holding nuclei together when
they move relative to one another.
◉ Why is graphite able to conduct electricity while diamond is not?
Answer: Graphite has unhybridized p- orbitals forming a delocalized
pi bonding network for mobile electrons.
◉ What type of bonding is present in BN, the second hardest known
substance?
, Answer: A 3D network of covalent bonds
◉ Why is it impossible to predict the state of matter of a product (C)
simply from the states of the reactants (A+B)?
Answer: The state depends on the specific bonding and interactions
present within the product molecule.
◉ How does rotation differ between a carbon-carbon single bond
and a double bond?
Answer: Free rotation occurs around single bonds, while rotation is
restricted around double bonds.
◉ Between Cl2 and Ar, which is predicted to have the higher boiling
point?
Answer: Cl2
◉ The strength of London dispersion forces (LDFs) primarily
depends on the size of the ____.
Answer: electron cloud
◉ How many lone pairs of electrons are on the sulfur atom in SCl2?
Answer: 2 lone pairs
