.png){kind=logo}
CHEM 120 WEEK 8 FINAL EXAM 2 VERSIONS 250 QUESTIONS AND ( ANSWERS)
CHEM 120 WEEK 8 FINAL EXAM 2 VERSIONS 2026-
2026 250 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES (
ANSWERS)
VERSION A
Select the correct products of the acid-base reaction of CH3CH2OH +
HCl?
A) +CH4CH2OH + ClB) CH3CH2OCl + H2
C) CH3CH2O- + H2Cl+
D) CH3CH2O+H2 + Cl- - ANSWER- D
Which of the reactions below can proceed to completion?
a. CH3COOH + NH3 CH3COO- + NH4+
pKa=4.8 pKa=36 pKa=9.4
b. CH3CH2OH + NH3 CH3CH2O- + NH4+
pKa=15.9 pKa=36 pKa=9.4
c. CH3CH2OH + CH3COO- CH3CH2O- + CH3COOH
pKa=15.9 pKa=4.8
A) a,b,c
B) a only
C) c only
D) b only
E) b and c only - ANSWER- B
A carboxylic acids (RCOOH) with a long alkyl chain (R) can function as
a surfactant (soap) in its anionic form (RCOO-). The pKa of the acid is
about 4.8. Under what pH value RCOOH will not be able to function as
a surfactant?
A) 3 B) 6 C) 12 D) 48 - ANSWER- A
A mixture solution of acetic acid (CH3COOH, PKa =4.8) and sodium
acetate (CH3COONa) can be used as a buffer. At what molar ratio of
these two compounds, the solution has the equal pH stabilization power
for both acid and base introduced into the solution?
A) 4.8:1 B) 1:1 C) 1:4.8 D) 104.8:1 - ANSWER- B
11 Which of the following is the strongest base?
HO-, F-, Cl-, H2NA) HO- B) H2N- C) Cl- D) F- - ANSWER- B
1 What is the smallest alkane that is a liquid at room temperatures (say
20 oC)?
A) Propane
B) Butane
C) Pentane
D) Hexane - ANSWER- C
What is the IUPAC name of the alkene?
A) 6-Chloro-3-heptene
B) 2-Chloro-3-heptene
C) 2-Chloro-4-heptene
D) 2-heptenyl chloride - ANSWER- A
Both 1-pentene and cylcopentane have the same molecular formula.
They are:
A) conformers.
B) not related.
C) constitutional isomers - ANSWER- C
How many alkene-type constitutional isomers share the formula C6H12?
A) 9 B) 10 C) 11 D) 12 - ANSWER- D
To assign E,Z configuration of an alkene, priority of two substituents (or
groups) on each of the two double bond carbons need to be determined.
What factor determines their priority?
A) Alphabetical order of their names
B) Number of atoms in the groups
C) the atomic number (or weight) of the first atom in each group -
ANSWER- C
Which of the following is the strongest nucleophile?
A) HO- B) H2N- C) Cl- D) F- - ANSWER- B
In which of the following compounds, the proton is the strongest
electrophile?
A) HF B) HI C) HBr - ANSWER- B
For the reaction A ⇌ B, which of the following is the correct expression
of the rate (R) of the forward reaction?
A) R = [A]
B) R = k[A][B]
C) R = k[A]/[B]
D) R = k[A] - ANSWER- D
.png)