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Straighterline Chemistry Final- deck 2 Exam/50 Questions & Answers
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Straighterline Chemistry Final- deck 2Exam/50 Questions & Answers
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 - -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 - -d. 0.4660 mol
-If 119.3 g of PCl5 are formed from the reaction of 61.3 g Cl2 with excess
PCl3, what is the percent yield?
PCl3(g) + Cl2(g) → PCl5(g)
Select one:
a. 94.6%
b. 66.3%
c. 57.3%
d. 51.3%
e. 48.6% - -b. 66.3%
-What mass of ammonia is formed when 5.36 g of nitrogen gas reacts with
excess hydrogen gas?
Select one:
a. 3.26 g
b. 0.629 g
c. 13.04 g
d. 17.63 g
e. 6.52 g - -e. 6.52 g
, -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. - -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 - -b. 15.4 g
-What is the pH of a 0.050 M triethylamine, (C2H5)3N, solution?
Kb for triethylamine is 5.3 × 10-4.
Select one:
a. 11.69
b. 8.68
c. 5.32
d. 2.31
e. 1.30 - -a. 11.69
-Which one of the following is a strong acid?
Select one:
a. CH3COOH
b. H2SO3
c. NH3
d. H3PO4
e. HClO3 - -e. HClO3
-Which is a Lewis acid?
Select one:
a. CH3NH2
b. BCl3
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