6.36-6.46 Nuclear

Question 1

Does Nuclear power release Carbon dioxide?

Answer 1

No

Question 2

Give two disadvantages to nuclear power

Answer 2

.Safety risk of radiation leaking
.Chain reaction becoming uncontrollable and causing a meltdown
.Security risk-people may try and obtain radioactive material
.public perception of nuclear power is negative
.Waste disposal is difficult

Question 3

Which 3 nuclear reactions can be used for energy?

Answer 3

.Fission
.Fusion
.Radioactive decay

Question 4

What isotope is used in nuclear fission?

Answer 4

Uranium 235

Question 5

What does the nuclear fission of U-235 produce?

Answer 5

Two daughter nuclei and the emission of two or more electrons, accompanied by the release of energy

Question 6

How is the chain reaction controlled?

Answer 6

Moderators-slows down the emitted neutrons

.Control rods-Absorb excess neutrons

Question 7

How is heat energy from the chain reaction used in the generation of electricity?

Answer 7

.Heat energy is absorbed by water which evaporates into steam, and used to turn a turbine which turns the generator to generate electricity

Question 8

What are the products of nuclear fission?

Answer 8

Radioactive

Question 9

How would you describe nuclear fusion?

Answer 9

.The creation of larger nuclei, resulting in loss of mass for smaller nuclei accompanied by the release of energy

Question 10

Nuclear fusion is the energy source for what?

Answer 10

Stars

Question 11

Whats the difference between nuclear fusion and nuclear fission?

Answer 11

.Fission is the splitting of heavy unstable nucleus into two lighter nuclei
.Fusion is the process where two light nuclei combine to release vast amounts of energy

Question 12

Why does nuclear fusion not happen at low temperatures?

Answer 12

.Due to the electrostatic repulsion of protons