Nuclear Reactions and Half-Life

You have 20 grams of uranium that has a half-life of 2 seconds, how much will be left after 4 seconds?

• 5 grams

• 2 seconds

• 6 grams

• 8 grams

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The time taken for half of an amount of radioactive atoms to decay.

• Nuclear fusion

• Full-life

• Dead time

• Half-life

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Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in an 18.0 g sample

after 60 hours?

• 2.25 g

• 1.125 g

• 4.5 g

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Nitrogen-16 has a half-life of 7.2 seconds. How much nitrogen-16 will remain in a 100 g

sample in 21.6 seconds?

• 12.5 g

• 25 g

• 2 g

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What makes something radioactive?

• elements with an atomic number above 81

• an unstable nucleus

• contaminated sewage

• It decays over time

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A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

• more

• less

• identical

• small

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Takes two small nuclei and combines them into a larger nucleus

• fission

• fusion

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The splitting of a nucleus into smaller nuclei is

• fusion

• fission

• half-life

• gamma radiation

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When nuclei decay, massive amounts of __________ is released.

• energy

• electrons

• protons

• neutrons

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Process by which nuclei having small masses combine to form a nucleus with a heavier mass is...

• nuclear fission

• a chemical reaction

• nuclear fusion

• a chain reaction

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