Half-Life

Half-Life

Assessment

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 into a different substance.

2.

FLASHCARD QUESTION

Front

What is alpha decay?

Back

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, consisting of 2 protons and 2 neutrons, resulting in a new element.

3.

FLASHCARD QUESTION

Front

What is beta decay?

Back

Beta decay is a type of radioactive decay in which a beta particle (an electron or positron) is emitted from an atomic nucleus, transforming a neutron into a proton or vice versa.

4.

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.

5.

FLASHCARD QUESTION

Front

If an isotope has a Half-Life of 5 days, how much of the original sample remains after 15 days?

Back

After 15 days (which is 3 Half-Lives), 12.5% of the original sample remains.

6.

FLASHCARD QUESTION

Front

How do you calculate the number of Half-Lives that have passed?

Back

To calculate the number of Half-Lives that have passed, divide the total time elapsed by the Half-Life of the isotope.

7.

FLASHCARD QUESTION

Front

What happens to the amount of the parent isotope over time?

Back

The amount of the parent isotope decreases over time as it decays into daughter isotopes.

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