STRAIGHTERLINE CHEMISTRY FINAL EXAM -WITH PEARSON MODULE COMFORT ( guarantee To pass ) GRADE A+.
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Course
STRAIGHTERLINE CHEMISTRY F
Institution
STRAIGHTERLINE CHEMISTRY F
STRAIGHTERLINE CHEMISTRY FINAL EXAM -WITH
PEARSON MODULE COMFORT ( guarantee To pass ) GRADE
A+.
When PCl5 solidifies it forms PCl4+cations and PCl6- anions. According to valence
bond theory, what hybrid orbitals are used by phosphorus in the PCl4+cation?
Select one:
a. sp
b. sp2
c. sp3
d....
STRAIGHTERLINE CHEMISTRY FINAL EXAM -WITH
PEARSON MODULE COMFORT ( guarantee To pass ) GRADE
A+.
When PCl5 solidifies it forms PCl4+cations and PCl6- anions. According to valence
bond theory, what hybrid orbitals are used by phosphorus in the PCl4+cation?
Select one:
a. sp
b. sp2
c. sp3
d. sp3d
e. sp3d2 - CORRECT ANSWERS-c. sp3
What is the number of lone electron pairs on the central atom of a molecule having a
trigonal pyramidal molecular geometry, such as NH3?
Select one:
a. 1
b. 2
c. 3
d. 0
e. 4 - CORRECT ANSWERS-a. 1
For which one of the following molecules is the indicated type of hybridization not
appropriate for the central atom?
Select one:
a. BeCl2; sp2
b. SiH4; sp3
c. BF3; sp2
d. C2H2; sp
e. H2O; sp3 - CORRECT ANSWERS-a. BeCl2; sp2
According to the VSEPR model, the predicted molecular geometry of ammonia, NH3, is
Select one:
According to the VSEPR model, a molecule with the general formula AB5 with one lone
pair on the central atom will have a ______ molecular geometry.
Select one:
a. tetrahedral
b. trigonalbipyramidal
c. square pyramidal
d. octahedral
e. seesaw - CORRECT ANSWERS-c. square pyramidal
Which is the most reasonable prediction for the three F-Br-F bond angles in BrF3?
,Select one:
a. 90°, 90°, and 180°
b. 86°, 94°, and 180°
c. 86°, 86°, and 172°
d. 94°, 94°, and 172°
e. 120°, 120°, and 120° - CORRECT ANSWERS-c. 86°, 86°, and 172°
a. linear.
b. trigonal planar.
c. bent.
d. tetrahedral.
e. trigonal pyramidal. - CORRECT ANSWERS-e. trigonal pyramidal.
What is the mass of one copper atom? (NA = 6.022 × 1023 mol-1)
Select one:
a. 1.055 × 10-22 g
b. 63.55 g
c. 1 amu
d. 1.66 × 10-24 g
e. 9.476 × 1021 g - CORRECT ANSWERS-a. 1.055 × 10-22 g
What is the percent sulfur in iron(III) sulfate?
Select one:
a. 28%
b. 32%
c. 24%
d. 48%
e. 42% - CORRECT ANSWERS-c. 24%
Proteins found in humans are polymers that consist of different combinations of 20
amino acids. Proline, one of the 20 amino acids, has the molecular formula, C5H9NO2.
If a human protein has 25 proline monomers, how many carbon atoms from proline are
present in the protein?
Select one:
a. 4 C atoms
b. 25 C atoms
c. 40 C atoms
d. 100 C atoms
e. 125 C atoms - CORRECT ANSWERS-e. 125 C atoms
Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the
manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.
Select one:
a. 2.377 mol
,b. 2.146 mol
c. 1.105 mol
d. 0.4660 mol
e. 0.4207 mol - CORRECT ANSWERS-d. 0.4660 mol
Once the following equation is balanced with the smallest set of whole number
coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of
one.)
__ SF4 + __ H2O → __ H2SO3 + __ HF
Select one:
a. 4
b. 6
c. 7
d. 9
e. None of these answers is correct. - CORRECT ANSWERS-d. 9
What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g
of Cr2O3 with 8.00 g of aluminum according to the chemical equation below?
2Al + Cr2O3 → Al2O3 + 2Cr
Select one:
a. 7.7 g
b. 15.4 g
c. 27.4 g
d. 30.8 g
e. 49.9 g - CORRECT ANSWERS-b. 15.4 g
Which one of the following is a strong acid?
Select one:
a. CH3COOH
b. H2SO3
c. NH3
d. H3PO4
e. HClO3 - CORRECT ANSWERS-e. HClO3
Which is a Lewis acid?
Select one:
a. CH3NH2
b. BCl3
c. F-
d. BF4-
e. CH4 - CORRECT ANSWERS-b. BCl3
Which is an amphoteric oxide?
Select one:
, a. Na2O
b. MgO
c. Al2O3
d. SO2
e. Cl2O7 - CORRECT ANSWERS-c. Al2O3
What is the term used for findings that are summarized based on a pattern or trend?
a. Law
b. Hypothesis
c. Theory
d. Phenomena
e. Prediction - CORRECT ANSWERS-a. Law
Which of the following is a tentative explanation for a set of observations?
Select one:
a. Law
b. Hypothesis
c. Theory
d. Phenomena
e. Prediction - CORRECT ANSWERS-b. Hypothesis
If a liquid contains 60% sugar and 40% water throughout its composition then what is it
called?
Select one:
a. Solute
b. Compound
c. Homogeneous mixture
d. Heterogeneous mixture
e. Solvent - CORRECT ANSWERS-c. Homogeneous mixture
Which of the following does not have a uniform composition throughout?
Select one:
a. Element
b. Compound
c. Homogeneous mixture
d. Heterogeneous mixture
e. Solvent - CORRECT ANSWERS-d. Heterogeneous mixture
Which one of these represents a physical change?
Select one:
a. Water, when heated, forms steam.
b. Bleach turns hair yellow.
c. Sugar, when heated, becomes brown.
d. Milk turns sour.
e. Apples, when exposed to air, turn brown. - CORRECT ANSWERS-a. Water, when
heated, forms steam.
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