Chapter 25:3 fission and fusion

Question 1

When more neutrons are released by fission what occurs?

Answer 1

A chain reaction

Question 2

Is a nuclear chain reaction controlled?

Answer 2

No

Question 3

Can fission be controlled?

Answer 3

Yes so the energy is released slower

Question 4

Neutron moderation and neutron absorption are needed to do what?

Answer 4

To control fission in a nuclear reactor

Question 5

What process slows down neutrons so the reactor fuel can capture them?

Answer 5

Neutron moderation

Question 6

What process decreases and slows the amount of neutrons?

Answer 6

Neutron absorption

Question 7

What are used to absorb neutrons?

Answer 7

Control rods

Question 8

What is the process of the nuclei splitting into smaller fragments called?

Answer 8

Fission

Question 9

What is a major source of nuclear waste?

Answer 9

Fuel rods from a nuclear power plant

Question 10

How many rods form an assembly?

Answer 10

300

Question 11

How many assemblies form the reactor core?

Answer 11

100 assemblies

Question 12

What is the source of most energy on earth

Answer 12

The sun

Question 13

What occurs when the nuclei combine to produce the nucleus of a greater mass?

Answer 13

Fusion

Question 14

What happens during fussion?

Answer 14

Small nuclei combine

Question 15

What releases more energy? Fusion or fission

Answer 15

Fusion

Question 16

Does fusion occur at low or high temperatures?

Answer 16

High “ excess of 40,000,000 Celsius”