Transcript Week 11

1. Which of the following statements are
characteristic of an alpha particle?
I. It is positively charged.
II. It has no mass or charge.
III. It's symbol is 0-1e.
IV. It has poor penetrating ability
a.
b.
c.
I only
II only
III only
d. I and IV
e. II and IV
2. Deuterium (2H) is common product of the fusion
process. Often called “heavy hydrogen”, deuterium
consists of one proton and neutron. Which of the
following atoms could undergo fusion to become
deuterium?
A. U and an alpha particle c. H and H
B. He and H
d. H and a neutron
3. The half-life of francium-212 is 19 minutes.
How many minutes will it take for 1 gram of this
isotope to decay to 0.125 grams?
a. 4.75 minutes
c. 38 minutes
b. 9.5 minutes
d. 57 minutes
4. The half-life of cadmium-109 is 464 days. A
scientist measures out a 256.0 g sample.
Approximately how many grams of cadmium-109
would remain after 1,392 days?
a. 32.0 g
b. 64.0 g
c. 2,048.0 g
d. 1,024.0 g
A. What is the half-life of a 100.0 g sample of
nitrogen-16 that decays to 12.5 g of nitrogen16 in 21.6 s?
B. If the half-life of iodine-131 is 8.10 days, how
long will it take a 50.00 g sample to decay to
6.25 g?
c. Potassium-42 has a half-life of 12.4 hours.
How much of an 848 g sample of potassium42 will be left after 62.0 hours?
5. Which of the following correctly
balances this nuclear fission reaction?
6. Nuclear fission is a powerful energy source, used in
both nuclear power plant and atomic bombs. Which
statement is a possible description of the nuclear fission
of U-235?
a) U-235 absorbs one neutron and splits into an atom of
krypton-94 and an atom of barium-139.
b) U-235 absorbs one neutron and splits into an atom of
krypton-94, an atom of barium-139 and three
neutrons.
c) U-235 absorbs one neutron and splits into an atom of
krypton-94, an atom of barium-139, and two
neutrons.
d) U-235 absorbs one neutron and splits into an atom of
krypton-94, an atom of barium-139 and one neutron.
7. Where would you find a nuclear
fusion reaction occurring?
a.
b.
c.
d.
In a nuclear power plant
In the Sun
In an X-ray machine
In a microwave oven
8. The beta decay of cesium-137 has a
half-life of 30 years. How many years
must pass to reduce a 25mg sample of
cesium 137 to 6.25 mg?
A. 30 years
B. 60 years
C. 75 years
D. 90 years
9. Identify an element that cannot participate
in nuclear fission reactions.
A. Plutonium
C. Uranium
B. Hydrogen
D. Thorium
10. Fission and fusion are two methods of
producing nuclear energy. Which method
is used in nuclear power reactors and
why?
A.
B.
C.
D.
Fusion, because it creates less waste.
Fission, because it produces more energy per atom of fuel.
Fusion, because it produces more energy per atom of fuel.
Fission, because fusion requires a large input of energy in
order to occur.