AnswersS1S Chemistry B E4912 - AGNuclear Energy

Nuclear Energy Answers

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1
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The storage method used for radioactive wastes generated from fission nuclear reactors must be designed to last for how long?

A
months
B
years
C
centuries
D
weeks
2
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During a heat wave, there is an increased demand for electricity to operate air conditioners. The basic design of a nuclear reactor that generates electricity is shown below.

Question illustration
A
lower the control rods, which will absorb more neutrons before they can split atoms
B
raise the control rods so that fewer neutrons are absorbed and more can split uranium atoms
C
remove some of the fuel rods, which will leave more room for additional neutrons to split atoms
D
add additional fuel rods to generate additional neutrons to split uranium atoms
3

Why are very high temperatures and pressures required for fusion to occur?

A
to generate the neutrons that are needed to break the nuclei
B
to overcome the repulsion between the protons in the nuclei that join
C
to maintain the proper conditions to keep the chain reaction going
D
to keep the uranium fuel separate from the control rods
4

How do fission nuclear reactions differ from fusion nuclear reactions?

A
Fission reactions involve the conversion of matter into energy, but fusion reactions do not.
B
Fusion reactions involve the conversion of matter into energy, but fission reactions do not.
C
Fission reactions are used to generate electricity for consumers, but fusion reactions are not.
D
Fusion reactions are used to generate electricity for consumers, but fission reactions are not.
5

In which situation is nuclear power most beneficial?

A
if there is a low concentration of people
B
if there is a nearby supply of fossil fuels
C
if there is an isolated location
D
if there are many other energy resources
6

The image shows a process that releases nuclear energy.

Question illustration
A
The process must be fusion because energy is released.
B
The process must be fusion because a heavier nucleus forms from smaller nuclei.
C
The process must be fission because a large nucleus breaks into smaller nuclei.
D
The process must be fission because neutrons are formed.
7

Which is a concern about mining for uranium?

A
Heated water could be released into the environment.
B
Dust released in the air could be radioactive.
C
Supplies could become low during a drought.
D
It is too commonly found, and mines could be too plentiful.
8

During early research in nuclear energy, why were scientists surprised that the products from splitting a uranium nucleus had less mass than the reactants?

A
They expected that the large release of energy would cause an increase in mass.
B
Up to that time, only chemical changes were known to form less mass than they started with.
C
All known changes always started and ended with the same amount of mass.
D
Other known nuclear changes resulted in the same mass of products as reactants.
9

Which refers to the continuous release of nuclear energy caused when one fission reaction triggers more nuclear reactions?

A
fusion reaction
B
trigger effect
C
energy effect
D
chain reaction
10

Improvements in which area would help reduce the possibility of damage to the environment when using uranium as a fuel?

A
more-efficient extraction techniques
B
better control of fusion reactions
C
stronger-pumping wells
D
thicker shielding around the reactor
11

What is the correct order of energy conversions associated with a power plant that uses nuclear fission reactions?

A
thermal to nuclear to mechanical to electrical
B
thermal to mechanical to nuclear to electrical
C
nuclear to mechanical to electrical to thermal
D
nuclear to thermal to mechanical to electrical
12

Which element is the primary fuel used to generate electricity using nuclear energy?

A
coal
B
hydrogen
C
uranium
D
helium
13

What is Albert Einstein’s contribution to the understanding of nuclear energy?

A
He proposed that matter can be converted to energy and vice versa.
B
He first discovered that nuclear-reaction products are lighter than the reactants.
C
He developed the use of nuclear reactions to generate electricity.
D
He demonstrated that a uranium nucleus splits and releases neutrons.
14

What is the main reason why many nuclear power plants are located near bodies of water?

A
to wash wastes out of the power plant
B
to be close to shipping lanes for frequent fuel delivery
C
to have easy access to a coolant for the reactor
D
to avoid problems with water supply during a drought

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