STRAIGHTERLINE CHEMISTRY FINAL EXAM
COMPREHENSIVE TEST PAPER 2026
COMPLETE QUESTIONS AND ANSWERS
EXPERT VERIFIED GRADED A+
◉ 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. Answer: 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. Answer: a. BeCl2; sp2
◉ According to the VSEPR model, the predicted molecular geometry
of ammonia, NH3, is
Select one:
a. linear.
b. trigonal planar.
c. bent.
d. tetrahedral.
e. trigonal pyramidal.. Answer: 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. Answer: 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%. Answer: 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. Answer: 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. Answer: 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.. Answer: 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
COMPREHENSIVE TEST PAPER 2026
COMPLETE QUESTIONS AND ANSWERS
EXPERT VERIFIED GRADED A+
◉ 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. Answer: 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. Answer: a. BeCl2; sp2
◉ According to the VSEPR model, the predicted molecular geometry
of ammonia, NH3, is
Select one:
a. linear.
b. trigonal planar.
c. bent.
d. tetrahedral.
e. trigonal pyramidal.. Answer: 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. Answer: 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%. Answer: 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. Answer: 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. Answer: 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.. Answer: 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
