Half-Life Practice
Flashcard
•
Chemistry
•
9th - 12th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is half-life?
Back
Half-life is the time required for half of the radioactive atoms in a sample to decay.
2.
FLASHCARD QUESTION
Front
How do you calculate the remaining mass after a certain number of half-lives?
Back
Remaining mass = Initial mass × (1/2)^(number of half-lives)
3.
FLASHCARD QUESTION
Front
If a sample has a half-life of 10 days, how much of a 40 g sample remains after 30 days?
Back
5 g remains after 30 days (3 half-lives: 40g -> 20g -> 10g -> 5g).
4.
FLASHCARD QUESTION
Front
What is the formula to find the number of half-lives that have passed?
Back
Number of half-lives = Total time elapsed / Half-life duration.
5.
FLASHCARD QUESTION
Front
If a radioisotope has a half-life of 5 hours, how much of a 16 g sample remains after 15 hours?
Back
2 g remains after 15 hours (3 half-lives: 16g -> 8g -> 4g -> 2g).
6.
FLASHCARD QUESTION
Front
What is the relationship between half-life and decay constant?
Back
Decay constant (λ) = ln(2) / half-life.
7.
FLASHCARD QUESTION
Front
How do you determine the half-life from a decay graph?
Back
Identify the time it takes for the substance to reduce to half its initial amount.
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