Chem Test

what is the total number of years that must pass before only 25.00 grams of an original 100.0 gram sample of C-14 remains unchanged?

11,460 y

what is the mass number of an alpha particle?

4

An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remains unchanged after 8.32 seconds. what is the half-life of fluorine-21

4.16 s

determine the total time that must elapse until only 1/4 of an original sample of the radioisotope Rn-222 remains unchanged?

7.6g

Which particle is emitted when an atom of 85Kr spontaneously decays?

A beta particle

A beta particle may be spontaneously emitted from

An unstable nucleus

what is the decay mode of 37 K

B+

which radioisotope is used for diagnosing thyroid cancer

I-131

What is a problem commonly associated with nuclear power facilities?

It is difficult to dispose of waste

which radioavitve isotpe is used in treating cancer

cobalt-60

The energy released by a nuclear reaction results primarily from the

conversion of mass into energy

which one of the following nuclides has a half-life that is less than one minute?

francium-20

A nuclear reaction in which two light nuclei combine to form a more massive nucleus is called

fusion

which nuclear decay emission consists of energy, only?

gamma radiation

A nuclear fission reaction and a nuclear fusion reaction are similar because both reactions

release a large amount of energy

Atoms of I-131 decay when the

unstable nuclei emit beta particles.

A change in the nucleus of an atom that converts the atom from one element to another element is called

Transmutation

A serious risk factor associated with the operation of a nuclear power plant is the production of

Radioisotopes with long half-lives