nuclear chem
What fraction of Sr-90 sample remains unchanged after 87.3 years?
1/8
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?
11,430 y
After decaying for 48 hours, 1/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?
12 h
An original sample of the radioisotope sample remains unchanged after 8.32 seconds. What is the half life of fluorine-21?
4.16 s
what is spontaneous decay?
natural transmutaion
Which radioisotope has the fastest rate of decay?
Ca-37
A sample of which radioisotope emits particles having the greatest mass?
Fr-220
Which emission causes the atomic number of a nuclide to decrease by 2 and its mass number to decrease by 4?
an alpha particle
which particle has the LEAST mass?
beta particle
the ratio of the mass of U-238 to the mass of Pb-206 can be used to
date geological formation
which radioactive emission has the greatest penetrating power, but LEAST ionizing power
gamma ray
Iodine-131 is used for diagnosing thyroid disorder's because it is absorbed by the thyroid gland and
has a very short short half life
which nuclide is paired with a specific use of that nuclide?
iodine-131, treatment of thyroid disorders
radiated food can be safely stored for a longer time because radiation
kills bacteria
which statement describes a benefit of using fission reactions?
large amounts of energy are produced per mole of reactant
nuclear fusion
lighter nuclei combine to produce heavier nuclei
the energy released by a nuclear fusion reaction is produced when
mass is converted to energy
nuclear fission
splitting of large nuclei to produce smaller ones.
using equal mass of reactants, which statement describes the relative amounts of energy released during a chemical reaction?
the nuclear reaction releases more energy than the chemical reaction
A change in the nucleus of an atom that converts the atom from one element to another is called
transmutation
