Half-Life and Radioactive Decay Kinetics
Chemistry ⇒ Chemical Kinetics and Equilibrium
Half-Life and Radioactive Decay Kinetics starts at 11 and continues till grade 12.
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A 10 g sample of a radioactive isotope has a half-life of 2 days. How much will remain after 8 days?
A 50 g sample of a radioactive isotope decays to 6.25 g in 24 hours. What is the half-life of the isotope?
A radioactive isotope decays to 1/16 of its original amount in 20 days. What is its half-life?
A radioactive isotope has a decay constant of 0.231 day-1. Calculate its half-life.
A radioactive sample contains 80 mg of a substance. If its half-life is 2 hours, how much will remain after 6 hours?
A radioactive sample has a decay constant of 0.1 day-1. What is its half-life?
A radioactive sample has a half-life of 2 days. If you start with 32 g, how much will remain after 6 days?
A radioactive sample has a half-life of 6 hours. If you start with 80 g, how much will remain after 18 hours?
A sample of a radioactive isotope decays from 200 g to 25 g in 12 hours. What is its half-life?
A scientist measures the activity of a radioactive sample and finds it has decreased to 25% of its original value. How many half-lives have passed?
Define half-life in the context of radioactive decay.
Describe how the concept of half-life is used in radiometric dating.
Describe the difference between half-life and mean life of a radioactive substance.
Explain why radioactive decay is considered a random process.
Explain why the decay of radioactive nuclei is considered a first-order reaction.
Explain why the half-life of a radioactive isotope is considered a constant.
If a radioactive element has a half-life of 5 days, what fraction of the original sample remains after 15 days?
If a radioactive isotope has a half-life of 1 year, what percentage of the original sample remains after 3 years?
If the half-life of a radioactive isotope is 12 hours, how long will it take for 87.5% of the sample to decay?
If the half-life of a radioactive isotope is 4 hours, how many half-lives have passed after 16 hours?
