SPS4. Nuclear Chemistry

What are the changes in nuclear structure as a result of fission and fusion?

• The nucleus becomes larger in fission and smaller in fusion.

• The nucleus becomes smaller in fission and larger in fusion.

• The nucleus remains the same size in both fission and fusion.

• The nucleus becomes unstable in fission and stable in fusion.

Tags

SPS4a

Which process involves the splitting of a nucleus into two smaller nuclei?

• Fusion

• Radioactive decay

• Half-life

• Fission

Tags

SPS4a

Which of the following describes what is happening in the image provided?

• alpha decay

• beta decay

• fission

• fusion

Tags

NGSS.HS-PS1-8

Which process involves the combining of two smaller nuclei into a larger nucleus?

• Radioactive decay

• Fusion

• Half-life

• Fission

Tags

SPS4a

What is the time it takes for half of a radioactive substance to decay called?

• Radioactive period

• Half-life

• Decay time

• Nuclear breakdown

Tags

SPS4b

After 60 days, 100g of a certain element has decayed to only 12.5g.  

What is the half- life of this element?

• 5 days

• 8 days 

• 20 days 

• 30 days 

Tags

SPS4b

What is the mathematical relationship between half-life and radioactive decay?

• Half-life is the time it takes for one-tenth of the radioactive material to decay.

• Half-life is the time it takes for half of the radioactive material to decay.

• Half-life is the time it takes for one-fourth of the radioactive material to decay.

• Half-life is the time it takes for all of the radioactive material to decay.

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SPS4b

Uranium-238, the most prevalent isotope in uranium ore, has a half-life of 4.5 billion years and spontaneously decays by alpha emission to thorium-234. If a sample of uranium ore contains 1,000 grams of uranium-238, how long will it take for 875 grams to decay to thorium-234? (875 grams is how much that has been lost/decayed. So 1000-875 = ? Based on that, how many half lives have taken place)

• 4.5 billion years

• 9.0 billion years 

• 13.5 billion years 

• 18.0 billion years

Tags

SPS4b

Which process involves the spontaneous breakdown of atomic nuclei?

• Fission

• Fusion

• Radioactive decay

• Half-life

Tags

SPS4b

• nuclear decay

• nuclear fission

• nuclear fusion

• nuclear half-life

Tags

NGSS.HS-PS1-8