Half-Life

Flashcard
•
Chemistry
•
9th - 12th Grade
•
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
What percentage of the parent isotope remains after 1 Half-Life?
Back
50% of the parent isotope remains after 1 Half-Life.
3.
FLASHCARD QUESTION
Front
What percentage of the parent isotope remains after 2 Half-Lives?
Back
25% of the parent isotope remains after 2 Half-Lives.
4.
FLASHCARD QUESTION
Front
If you start with 100 grams of a radioactive substance, how much will remain after 1 Half-Life?
Back
50 grams will remain after 1 Half-Life.
5.
FLASHCARD QUESTION
Front
If the Half-Life of an isotope is 3 days, how much of a 12 gram sample will remain after 3 days?
Back
6 grams will remain after 3 days.
6.
FLASHCARD QUESTION
Front
What is the formula to calculate the remaining quantity of a substance after n Half-Lives?
Back
Remaining quantity = Initial quantity × (1/2)^n.
7.
FLASHCARD QUESTION
Front
What type of decay is alpha decay?
Back
Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (2 protons and 2 neutrons).
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