CHEM 120 WEEK 8 FINAL EXAM 2 LATEST
VERSIONS 2024-2025 ACTUAL EXAM 150
QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES
Practice questions for this set
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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
Reduction of carbonyl compounds with hydride reagents is a common method to
obtain alcohols. Which of the following can be reduced to a tertiary alcohols?
2 A) a carboxylic acid ester
B) a ketone
C) a carboxylic acid chloride
D) none of them.
, The second main topic of this chapter is the effects of substituent on electrophilic
aromatic substitution reaction. A substituent on benzene can have two effects on EAS:
1. Increase or decrease reaction rate, 2. Direct the position of an EAS rxn. Groups like -
OR, -OH, -NH2, NR2 donate electron via resonance effect. Examine the resonance
structure of aniline (Ph-NH2), and answer the question: at what positions does the
electron donation of the amino group increase electron density significantly?
3
A) ortho positions only
B) meta positions only
C) para position only
D) ortho and para positions
E) all positions
What is the pH value of an acidic solution with a proton molar concentration of 10^-3?
4
A) 0.001 B) 0.003 C) 3 D) -3
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Terms in this set (171)
How many bonds can B
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.
,When two hydrogen atoms C
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.
, How do you determine the A
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
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