Chem 120 Week 8 Final Exam 2 Questions And Answers

1 | Page

CHEM 120 WEEK 8 FINAL EXAM 2 QUESTIONS
AND ANSWERS 2026\2027

How many bonds can nitrogen have? Which rule or principle
should be used?


A) Five bonds; octet rule.
B) Three bonds; octet rule.
C) Three bonds; the Hund's rule.
D) Five bonds; the Aufbau Principle. - CORRECT ANSWER - B




When two hydrogen atoms meet, they will attract to each other
and form a bond (and a H2 molecule). Why?


A) Because electrons like to stay together.
B) Because electrons like to be paired up.
C) Because there is attraction between the electron in one
hydrogen atom and the nucleus of another hydrogen atom.
D) Gravitational attraction between two atoms binds two
hydrogen atoms (or any two atoms) together into a
molecule. - CORRECT ANSWER - C

,2 | Page

How do you determine the number of electron domains on the
central atom?


A) Draw Lewis structure of the compound, then add up the
numbers of lone electron pair, single bond, double bond,
and triple bond.
B) The # of electron domains = the # of valence electrons
C) The # of electron domains = the number of atoms the central
atom is bonded to.
D) The # of electron domains = the # of valence electrons
divided by 2 - CORRECT ANSWER - A




Indicate partial charges on each atom of the following two
bonds: C-Br and O-N.


A) Carbon has partial negative charge and bromine has
partial positive charge; both oxygen and nitrogen have no
charge.
B) Carbon has partial positive charge and bromine has partial
negative charge; oxygen has partial negative charge and
nitrogen has partial positive charge.
C) Carbon has partial negative charge and bromine has
partial positive charge; oxygen has partial positive charge and
nitrogen has partial negative charge.
D) Carbon has partial positive charge and bromine has partial
negative charge; oxygen has partial positive charge and

,3 | Page

nitrogen has partial negative charge. - CORRECT ANSWER -
B




In which of the above structures, the nitrogen atom carries a
negative formal charge?
A) a
B) b
C) c
D) d - CORRECT ANSWER - A




In which of the above Lewis structures, the oxygen atom carries
a positive formal charge?
A) a
B) b,c
C) a,d
D) c
E) d - CORRECT ANSWER - B




Which of the following compounds exists?
A) CH3CH3CH3
B) (CH3) 2CCH3
C) CH3CHCH2CH3

, 4 | Page

D) (CH3)2CHCH3 - CORRECT ANSWER - D




Indicate hybridization of oxygen atom in the following
compounds:
H2O, H2C=O, H3O+, HO-, and CO


A) sp3, sp3, sp3, sp3, sp B) sp3, sp2, sp2, sp, sp
C) sp3, sp2, sp3, sp3, sp D) sp, sp2, sp2, sp, sp - CORRECT
ANSWER - C




Indicate hybridization of carbon in the above compounds.


A) sp3, sp2, sp3, sp2
B) sp3, sp2, sp2, sp2
C) sp3, sp3, sp3, sp2
D) sp3, sp3, sp3, sp3 - CORRECT ANSWER - A




What is the bond angle in a perfect tetrahedron molecule like
CH4?
A) 120
B) 0
C) 180