Nuclear Chemistry: Radioactive Decay and Half-Life

The time taken for half of an amount of radioactive atoms to decay.

• Nuclear fusion
• Full-life
• Dead time
• Half-life

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NGSS.HS-PS1-8

Q1. How much would a 40 gram sample of sodium-24 be left after decaying 45 hours if the half-life of sodium is 15 hours?

• 2.5 grams

• 3 grams

• 6.7 grams

• 5 grams

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NGSS.HS-PS1-8

Q3: If the patient is given a 4.0 gram sample of I-131 during therapy, how much I-131 remains in his body after 48.6 days, given the half-life of I-131 is 8.1 days?

• 0.03125 grams

• 0.0625 grams

• 1.0 gram

• 128.0 grams

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NGSS.HS-PS1-8

After decaying for 60 hours, 1/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?

• 3.0 h

• 9.6 h

• 12 h

• 15 h

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NGSS.HS-PS1-8

In order of most to least penetrating radiation we have

• Alpha , Beta, Gamma

• Beta , Gamma , Alpha

• Gamma, Beta, Alpha

• Gamma, Alpha, Beta

Which type of nuclear radiation is being emitted here?

• Alpha
• Positron

• gamma 
• beta

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NGSS.HS-PS1-8

The technetium-99 isotope has a half-life of 6.0 hours. If 200.0 mg were injected into a patient how much remains after 18 hours?

• 25.0 mg

• 30.0 mg

• 33 mg

• 35.2 mg

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NGSS.HS-PS1-8

What element is the ?

• Ag-115
• Cd-115
• Pd-115
• Not Listed

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NGSS.HS-PS1-8

If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:

• 16
• 32
• 48
• 64

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NGSS.MS-PS1-1

Which process occurs naturally in the center of stars like our Sun

• Bi-multiple reaction

• Fission

• chemical

• fusion

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NGSS.HS-PS1-8

NGSS.HS-ESS1-1