AP Chemistry-midterm review - Quia

e. They are often accompanied by the release of enormous amounts of energy.
____ 221. Which statement concerning stable nuclides and/or the "magic numbers" (such as 2, 8, 20, 28, 50, 82 or 128)
is false?
a. Nuclides with their number of protons equal to a "magic number" are especially stable.
b. Nuclides with their number of neutrons equal to a "magic number" are especially stable.
c. Nuclides with the sum of the numbers of their protons and neutrons equal to a "magic
number" are especially stable.
d. Above atomic number 20, the most stable nuclides have more protons than neutrons.
e. The existence of "magic numbers" suggests an energy level (shell) model for the nucleus.
Particles
Masses of subatomic particles that may be useful for the following questions.
electron 0.00055 amu
proton 1.0073 amu
neutron 1.0087 amu
____ 222. Refer to Particles. The mass of one atom of silicon is 29.9738 amu. What is its mass deficiency?
a. 1.742 amu
b. 1.757 amu
c. 0.275 amu
d. 0.413 amu
e. 0.272 amu
Values 26
Values that may be useful for the following questions.
speed of light = 3.00 10 8 m/s
1 J = 1 kg•m 2 /s 2
1 cal = 4.18 J
____ 223. Refer to Values 26. The mass deficiency for an isotope was found to be 0.410 amu/atom. Calculate the
binding energy in J/mol of atoms.
a. 3.69 10 13 J/mol
b. 1.23 10 20 J/mol
c. 3.69 10 3 J/mol
d. 1.23 10 3 J/mol
e. 1.23 10 23 J/mol
____ 224. Refer to Values 26. Calculate the nuclear binding energy in kJ/g of an isotope that has a mass deficiency of
0.6050 amu/atom. The isotope has a mass of 63.9280 amu.
a. 5.44 10 10 kJ/g
b. 1.89 10 10 kJ/g
c. 2.97 10 8 kJ/g
d. 3.48 10 12 kJ/g
e. 8.52 10 8 kJ/g
____ 225. Which isotope below has the smallest nuclear binding energy per gram? (No calculations are necessary.)
a. He