CEM 141 MSU EXAM 3 ACTUAL PAPER 2026 QUESTIONS WITH SOLUTIONS GRADED A+

CEM 141 MSU EXAM 3 ACTUAL PAPER 2026
QUESTIONS WITH SOLUTIONS 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?