Nuclear Chemistry Review

In her chemistry class, Hannah learned that a nuclear reaction always involves

• the electrons of an atom

• the nucleus of an atom

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NGSS.HS-PS1-8

You have two radioactive isotopes. Both isotopes have the same number of atoms, but one has a high decay constant and the other has a low decay constant. Which one would be decaying faster?

• The one with the high decay constant would be decaying faster

• The one with the low decay constant would be decaying faster

• Not enough information given

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NGSS.HS-PS1-8

If a 200 gram sample undergoes 2 half lives, how much of the sample will remain?

• 50 grams

• 100 grams

• 200 grams

• 25 grams

• 400 grams

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NGSS.HS-PS1-8

How much of the original sample would you have if you ended with a 10 gram sample and 3 half lives had occurred?

• 40 grams

• 60 grams

• 30 grams

• 15 grams

• 80 grams

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NGSS.HS-PS1-8

If 50% of a radioactive substance remains after one half-life, how much will remain after two half-lives?

• 25%

• 50%

• 75%

• Cannot be determined

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NGSS.HS-PS1-8

2 hours have passed. A half life is 1 hour. How much of your original sample would you expect to have?

• 12.5%
• 6.25%
• 50%
• 25%

If 4 half lives have passed and 1 half life is 30 minutes, how much time passed?

• 30 minutes

• 60 minutes

• 120 minutes

• Not enough information is given

If you have 25% of your sample left and 1 half life is 30 minutes, how much time passed?

• 30 minutes

• 60 minutes

• 90 minutes

• Not enough information is given

Characteristics of radioactive isotopes include

• they are stable

• they do not emit radiation

• they transform into other elements over time

• all of the above

• none of the above

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NGSS.HS-PS1-8

Beta decay involves the release of a beta particle. A beta particle is

• a helium nucleus

• a gamma ray

• an electron

• a positron

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NGSS.HS-PS1-8