Half-Life Practice
Flashcard
•
Chemistry
•
10th 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
If a substance has a half-life of 5 years, how much of a 20 g sample remains after 10 years?
Back
5 g (after 2 half-lives).
3.
FLASHCARD QUESTION
Front
What happens to the amount of a radioactive substance after each half-life?
Back
The amount of the substance is reduced by half.
4.
FLASHCARD QUESTION
Front
How many half-lives are needed for a substance to decay from 80 g to 10 g?
Back
4 half-lives.
5.
FLASHCARD QUESTION
Front
What is the half-life of a substance if 25% remains after 3 half-lives?
Back
The half-life is the time it takes for the substance to reduce to 50%.
6.
FLASHCARD QUESTION
Front
If the half-life of a substance is 10 days, how much of a 40 g sample remains after 30 days?
Back
5 g (after 3 half-lives).
7.
FLASHCARD QUESTION
Front
What is the formula to calculate remaining mass after n half-lives?
Back
Remaining mass = Initial mass × (1/2)^n.
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