Test
Half-life practice problems
This classroom material provides 10th-grade students with practice in calculating remaining mass after multiple half-lives, determining half-life from data, and applying concepts to carbon-14 dating through structured questions and problem-solving steps.
By Edform · Chemistry · Grade 10 · Published Oct 15, 2026 · New
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Questions
- A radioactive isotope has a half-life of 3 hours. If you start with 80 grams, how much remains after 6 hours?
- Which statements about half-life are correct?
- A sample of iodine-131 has a half-life of 8 days. How many days will it take for a 32 g sample to decay to 4 g?
- Put these steps in order for solving a half-life problem where you are given the initial mass, half-life, and time elapsed, and need to find the remaining mass.
- Match each isotope to its approximate half-life.
- Fill in the blanks with the correct numbers: If a fossil contains _ percent of its original carbon-14, it has gone through _ half-lives.
- Select the correct answer: If a sample starts with 100 grams and has a half-life of 5 years, after 15 years, ___ will remain.
- Sort the following statements into 'True for all radioactive decay' and 'Not always true'.
- Mark each statement as true or false about carbon-14 dating.
- What is the term for the time required for half of the atoms in a radioactive sample to decay?
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