TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD
OWNER: EMILLYCHARLOTTE
COPYRIGHT STATEMENT: ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED
FIRST PUBLISHED: SEPTEMBER 2024
CHEM 120 WEEK 8 FINAL EXAM 2 LATEST VERSIONS 2024-
2025 ACTUAL EXAM 150 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES
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. - 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. - Answer✔️✔️-C
How do you determine the number of electron domains on the central atom?
,TITLE: EMILLYCHARLOTTE 2024/2025 ACADEMIC PERIOD
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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 - 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 nitrogen has partial negative charge. - Answer✔️✔️-B
In which of the above structures, the nitrogen atom carries a negative formal charge?
A) a
B) b
C) c
D) d - Answer✔️✔️-A
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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 - Answer✔️✔️-B
Which of the following compounds exists?
A) CH3CH3CH3
B) (CH3) 2CCH3
C) CH3CHCH2CH3
D) (CH3)2CHCH3 - 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 - Answer✔️✔️-C
Indicate hybridization of carbon in the above compounds.
A) sp3, sp2, sp3, sp2
B) sp3, sp2, sp2, sp2
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C) sp3, sp3, sp3, sp2
D) sp3, sp3, sp3, sp3 - Answer✔️✔️-A
What is the bond angle in a perfect tetrahedron molecule like CH4?
A) 120
B) 0
C) 180
D) 109.5 - Answer✔️✔️-D
When SO3 reacts water, sulfuric acid (H2SO4) is formed. Is SO3 a BrØnsted-Lowry
acid?
A) No, it is not a BrØnsted-Lowry acid.
B) Yes, it is a BrØnsted-Lowry acid. - Answer✔️✔️-A
Conjugate acid and base is a concept unique to BrØnsted-Lowry acids and bases.
Which of the pairs below are not conjugate acid and base?
a. H2SO4 and SO42- b. H2CO3, CO2 c. HCl and Cl2 d. H3O+ and HO- e. HBr and Br-
A) a,b,c B) a,b,c,d C) a,b D) a,b,c,d,e E) e - Answer✔️✔️-B
What is the pH value of an acidic solution with a proton molar concentration of 10^-3?
A) 0.001 B) 0.003 C) 3 D) -3 - Answer✔️✔️-C
Gastric acid is composed of hydrochloric acid (HCl) - a strong acid. The pH range of
gastric acid is 1.5 to 3.5 in the human stomach. If the HCl concentration is 0.5 mole/liter
