Half-life

Half-life

Assessment

Flashcard

Chemistry

10th - 11th Grade

Hard

Created by

Wayground Content

FREE Resource

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15 questions

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1.

FLASHCARD QUESTION

Front

What is Half-life?

Back

The amount of time it takes for half the nuclei in a sample of the isotope to decay.

2.

FLASHCARD QUESTION

Front

If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?

Back

3 half-lives.

3.

FLASHCARD QUESTION

Front

After the third half-life, how much of the sample is left?

Back

1/8.

4.

FLASHCARD QUESTION

Front

If 10 mg of iodine-131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

Back

1.25 mg.

5.

FLASHCARD QUESTION

Front

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

Back

0.25 g.

6.

FLASHCARD QUESTION

Front

What happens to the amount of a radioactive substance after each half-life?

Back

It reduces to half of its previous amount.

7.

FLASHCARD QUESTION

Front

If a substance has a half-life of 10 years, how much of a 16 g sample will remain after 30 years?

Back

2 g.

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