Nuclear Reactions and Half-Life

This is an example of...

• Fission  reaction

• Fusion reaction

• Decomposition reaction

• Decay

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NGSS.HS-PS1-8

Solve this equation for beta decay.
₂₇⁶⁰Co = ___ + _-1⁰e

• ₂₅⁵⁶Mn

• ₂₈⁶⁰Ni

• ₂₃⁵⁸V

• ₂₇⁵⁹Co

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NGSS.HS-PS1-8

The most dangerous type of radiation is the ____. 

• alpha particle

• gamma ray

• beta particle

• uranium

The splitting of a nucleus into smaller nuclei is

• nuclear fusion

• nuclear fission

• radioactive half-life

• gamma radiation

• beta radiation

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NGSS.HS-PS1-8

Why does beta decay occur?

• The nucleus is too large to be stable

• The proton to neutron ratio is unstable

• The nucleus is in an excited state. This usually follows other types of decay.

• The nucleus is too small to be viable by itself

• The isotope has too many high energy electrons

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NGSS.HS-PS1-8

Technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a patient how much remains after 18 hours?

• 33.0 mg

• 12.5 mg

• .33 mg

• 15.8 mg

• 50.0 mg

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NGSS.HS-PS1-8

If you start with a complete sample, how much of the sample is left after the third half-life?

• 1/2

• 1/3

• 1/16

• 1/8

• 1/5

If 1,000 g of iodine-131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 125g

• 1,500g

• 1.25g

• 25g

• 50g

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NGSS.HS-PS1-8

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0g?

• 3.0g

• 1.25g

• 0.3g

• 0.25g

• 0.0125g

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NGSS.HS-PS1-8

If the half-life of uranium-232 is 70 years, how many years will it take for 10 g of it to be reduced to 1.25 g?

• 350 years

• 232 years

• 210 years

• 140 years

• 17 years

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NGSS.HS-PS1-8