Radioactive Decay
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
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16 questions
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1.
FLASHCARD QUESTION
Front
What is Radioactive Decay?
Back
The process by which an unstable atomic nucleus loses energy by emitting radiation.
2.
FLASHCARD QUESTION
Front
What is a Half-life?
Back
The amount of time it takes for half the nuclei in a sample of the isotope to decay.
3.
FLASHCARD QUESTION
Front
If 25% of the original radioactive atoms remain, how many half-lives have passed?
Back
2 half-lives.
4.
FLASHCARD QUESTION
Front
What fraction of a radioactive substance remains after 3 half-lives?
Back
1/8.
5.
FLASHCARD QUESTION
Front
How do you calculate the remaining amount of a substance after a certain number of half-lives?
Back
Use the formula: Remaining Amount = Initial Amount * (1/2)^(number of half-lives).
6.
FLASHCARD QUESTION
Front
What is the remaining percentage of carbon-14 after 22,800 years?
Back
6.25%.
7.
FLASHCARD QUESTION
Front
If an isotope has a half-life of 10 minutes, how much remains after 1 hour?
Back
1/64 of the original mass.
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