After three half-lives have elapsed, what fraction of the original amount of radionuclide remains? 1/3
1/4
None of these
1/8

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

Adilute aqueous potassium nitrate solution is

Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8×10^-5