Unit 4A Post Assessment

How does Tim's correct model of fission look?

• Reactants: 2 black, 1 red, 1 blue; Products: 1 red, 1 blue, 4 black

• Reactants: 2 black, 1 red, 1 blue; Products: 2 red, 2 blue, 2 black

• Reactants: 3 black, 1 red, 1 blue; Products: 1 red, 1 blue, 3 black

• Reactants: 4 black, 1 red, 1 blue; Products: 1 red, 1 blue, 4 black

Tags

NGSS.HS-PS1-8

Which statement best describes what happens in a fission reaction?

• Light nuclei form into heavier nuclei.

• Heavy nuclei split into lighter nuclei.

• Energy is released, and less stable elements are formed.

• Energy is absorbed, and more stable elements are formed.

Tags

NGSS.HS-PS1-8

Which of these are related to nuclear fusion reactions?

I. The splitting of the nucleus into fragments

II. The combining of atomic nuclei

III. The type of reaction that powers the stars

IV. The type of reaction that releases additional neutrons

• I and IV

• II and III

• I and III

• II and IV

Tags

NGSS.HS-PS1-8

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?

• 25 g

• 50 g

• 75 g

• 100 g

Based on the graph, what is the half-life of iodine-131?

• 24 days

• 16 days

• 8 days

• 4 days

Tags

NGSS.HS-PS1-8

Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has passed?

• 15 hours

• 30 hours

• 45 hours

• 60 hours

About how many grams of vanadium-49 will be left after 1,320 days?

• 11

• 22

• 32

• 43

Tags

NGSS.HS-PS1-8

Plutonium-239 is a radioactive isotope commonly used as fuel in nuclear reactors. The half-life of plutonium-239 is 24,100 years. About how long would it take 504 grams of plutonium-239 to decay until there were only 63 grams plutonium-239 left?

• 24,100 years

• 48,200 years

• 72,300 years

• 96,400 years

Tags

NGSS.HS-PS1-8

What is one of the problems with nuclear energy according to the diagram? Select all that apply.

• Nuclear waste can be easily disposed of.

• Nuclear waste can leak out of canisters.

• Nuclear waste is not hazardous.

• Nuclear waste is renewable.

Tags

NGSS.HS-ETS1-3

What does the graph mentioned in the document show?

• Types of energy used in the United States during the year 2015.

• Types of energy used in Europe during the year 2015.

• Types of energy used in the United States during the year 2020.

• Types of energy used in Asia during the year 2015.

Tags

NGSS.HS-ESS3-1