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by BlastRoom
Practice calculating how much radioactive material remains or how long decay took.
#chemistry
24 questions
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A 160 g sample of a radioisotope has a half-life of 6 h. How much remains after 18 h?
An isotope sample starts at 96 mg and has a half-life of 2 days. What remains after 8 days?
A 1.28 g radioisotope sample has a half-life of 5 min. How much remains after 15 min?
A 400 kBq radioactive source has a half-life of 3 years. What activity remains after 6 years?
A 64 g isotope sample has a half-life of 12 h. What mass remains after 48 h?
A 240 mg sample has a half-life of 10 min. What remains after 30 min?
A 72 g sample of a radioisotope has a half-life of 4 days. What remains after 12 days?
A 5.0 g sample has a half-life of 8 days. How much remains after 32 days?
A sample decreases from 96 g to 12 g. If its half-life is 4 days, how much time passed?
A source's activity falls from 640 Bq to 40 Bq. Its half-life is 5 h. How long did the decay take?
If 80 mg of a radioisotope decays to 10 mg in 18 h, what is the half-life?
A sample changes from 200 g to 25 g in 24 days. What is the half-life?
Use the decay table. What is the half-life of this radioisotope?
Use the decay table. What activity remains after 21 days?
Use the decay graph. What activity is shown at 12 hours?
Use the decay graph. What is the half-life of the isotope?
According to the table, how long does it take the activity to fall from its starting value to 125 Bq?
Read the decay graph. What activity remains at 15 min?
Use the activity table. What is the half-life of this source?
On the graph, at what time has the activity first dropped to 20 Bq?
Use the table. What activity remains at 16 h?
Use the decay graph. What half-life does the graph show?
Use the activity table. What activity is left after 9 min?
According to the graph, how long does it take for activity to fall from 400 Bq to 100 Bq?
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Oxidation Numbers
24 questions
