CEM 141 MSU EXAM 3 EXAM SCRIPT 2026 COMPLETE QUESTIONS AND CORRECT ANSWERS GRADED A+

CEM 141 MSU EXAM 3 EXAM SCRIPT 2026
COMPLETE QUESTIONS AND CORRECT
ANSWERS GRADED A+

●● Binding in Diamond.
Answer: Each carbon forms 4 bonds to 4 identical carbons; tetrahedral;
sp3


●● Valence Bond Theory.
Answer: The idea that covalent bonds are formed when orbitals of
different atoms overlap.


●● T/F: Electrons are localized in molecular orbital..
Answer: False


●● T/F: Electrons are localized in Valence Bond..
Answer: True


●● T/F: When the hybrid orbitals combine, there is a large gap between
the bonding and anti bonding orbitals..
Answer: True

, ●● Bonding in Tetrahedral C results in......
Answer: Sigma bonds.


●● Bonding in Graphite.
Answer: 3 sp2 orbitals; trigonal planar; sigma bond


●● Is graphite localized ?.
Answer: Has a localized sigma bond network but has a delocalized pi
network over the whole sheet of atoms.


●● What does a larger electron cloud provide?.
Answer: Higher boiling point and more surface area to overcome LDF's.


●● Can you rotate around a double bond?.
Answer: No - bonds will break.


●● What is a sigma bond?.
Answer: Single covalent bond (sp2-sp2 overlap).


●● What is a Pi Bond?.
Answer: Sideways overlap of p orbitals that occur in a double or triple
bond.