CHEM 120 WEEK 8 FINAL EXAM 2 LATEST VERSIONS ACTUAL EXAM 250 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+

CHEM 120 WEEK 8 FINAL EXAM 2 LATEST VERSIONS 2023-

2024 ACTUAL EXAM 250 QUESTIONS AND CORRECT

DETAILED ANSWERS WITH RATIONALES (VERIFIED

ANSWERS) |ALREADY GRADED A+

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

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