Half-life Exit Ticket
Flashcard
•
Chemistry
•
9th - 12th Grade
•
Practice Problem
•
Hard
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15 questions
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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
If a substance has a half-life of 8 days, how much of a 10 mg sample remains after 8 days?
Back
5 mg
3.
FLASHCARD QUESTION
Front
How much of a 10 mg sample remains after 16 days if the half-life is 8 days?
Back
2.5 mg
4.
FLASHCARD QUESTION
Front
What is the formula to calculate the remaining amount of a substance after a certain number of half-lives?
Back
Remaining amount = Initial amount × (1/2)^(number of half-lives)
5.
FLASHCARD QUESTION
Front
If the half-life of a substance is 2 minutes, how much of an 80 g sample remains after 6 minutes?
Back
10 g
6.
FLASHCARD QUESTION
Front
What is the half-life of iodine-131?
Back
8 days
7.
FLASHCARD QUESTION
Front
How many half-lives are needed for a 10 g sample to reduce to 1.25 g if the half-life is 70 years?
Back
3 half-lives
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