Half-Life
Flashcard
•
Chemistry
•
9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the definition of half-life?
Back
Half-life is the time required for half of the radioactive atoms in a sample to decay.
2.
FLASHCARD QUESTION
Front
If a substance has a half-life of 10 years, how much of a 100g sample remains after 20 years?
Back
25g (after 20 years, which is two half-lives, 100g -> 50g -> 25g).
3.
FLASHCARD QUESTION
Front
What is the half-life of uranium-238?
Back
4.5 billion years.
4.
FLASHCARD QUESTION
Front
How many half-lives are needed for a sample to reduce to 1/16 of its original amount?
Back
4 half-lives.
5.
FLASHCARD QUESTION
Front
If you start with 80g of a substance with a half-life of 5 years, how much will remain after 15 years?
Back
10g (after 15 years, which is three half-lives: 80g -> 40g -> 20g -> 10g).
6.
FLASHCARD QUESTION
Front
What is the half-life of iodine-131?
Back
8 days.
7.
FLASHCARD QUESTION
Front
How much of a 40mg sample of iodine-131 remains after 32 days?
Back
2.5mg (after 32 days, which is four half-lives: 40mg -> 20mg -> 10mg -> 5mg -> 2.5mg).
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