CEM 141 EXAM 3 2026 CERTIFICATION
EVALUATION EXAMS COMPLETE QUESTIONS
AND ANSWERS
◉ Formal Charge =.
Answer: Valence electrons - # of bonds - non bonded electrons
◉ Formal Charge on OH-?.
Answer: O: FC = 6 - 1 - 6 = -1.
◉ Valence Shell Electron Pair Repulsion (VSEPR).
Answer: Assume all centers of electrons density repel each other
and that there is a minimum energy arrangement that the atom will
naturally take up.
◉ T/F: Multiple bonds count as one center of electron density in
VSEPR..
Answer: True.
◉ What hybridization is tetrahedral?.
Answer: SP3.
, ◉ T/F: If there are no lone pairs on the central atom, the electron
center geometry and shape are the SAME..
Answer: True.
◉ Electronegativity.
Answer: Ability of an element to attract electrons to itself in a bond.
◉ Does electronegativity increase or decrease across a period?.
Answer: Increase.
◉ Does electronegativity increase or decrease down a group?.
Answer: Decreases.
◉ Polar Bonds.
Answer: When 2 atoms of different electronegativities bond, the
electrons are not shared equally (Dipole = polar)
◉ Is a C-H bond polar?.
Answer: No.
◉ Are bond Dipoles vector quantities?.
Answer: Yes, must have magnitude and direction.
EVALUATION EXAMS COMPLETE QUESTIONS
AND ANSWERS
◉ Formal Charge =.
Answer: Valence electrons - # of bonds - non bonded electrons
◉ Formal Charge on OH-?.
Answer: O: FC = 6 - 1 - 6 = -1.
◉ Valence Shell Electron Pair Repulsion (VSEPR).
Answer: Assume all centers of electrons density repel each other
and that there is a minimum energy arrangement that the atom will
naturally take up.
◉ T/F: Multiple bonds count as one center of electron density in
VSEPR..
Answer: True.
◉ What hybridization is tetrahedral?.
Answer: SP3.
, ◉ T/F: If there are no lone pairs on the central atom, the electron
center geometry and shape are the SAME..
Answer: True.
◉ Electronegativity.
Answer: Ability of an element to attract electrons to itself in a bond.
◉ Does electronegativity increase or decrease across a period?.
Answer: Increase.
◉ Does electronegativity increase or decrease down a group?.
Answer: Decreases.
◉ Polar Bonds.
Answer: When 2 atoms of different electronegativities bond, the
electrons are not shared equally (Dipole = polar)
◉ Is a C-H bond polar?.
Answer: No.
◉ Are bond Dipoles vector quantities?.
Answer: Yes, must have magnitude and direction.
