Half-Life Practice SET 3

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Chemistry
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9th - 12th Grade
•
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 = Original mass × (1/2)^(number of half-lives).
3.
FLASHCARD QUESTION
Front
If a sample has a half-life of 10 years, how much of a 100 g sample remains after 30 years?
Back
After 30 years (3 half-lives), 100 g × (1/2)^3 = 12.5 g remains.
4.
FLASHCARD QUESTION
Front
What fraction of a sample remains after 4 half-lives?
Back
1/16 of the original sample remains after 4 half-lives.
5.
FLASHCARD QUESTION
Front
If 64 grams of a substance remain after 3 half-lives, what was the original mass?
Back
The original mass was 512 grams.
6.
FLASHCARD QUESTION
Front
What happens to the half-life of a substance as it decays?
Back
The half-life remains constant regardless of the amount of substance present.
7.
FLASHCARD QUESTION
Front
How long will it take for a 20 g sample of strontium-90 to decay to 5 g?
Back
It will take 2 half-lives (approximately 145.5 years) for the sample to decay to 5 g.
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