The radioisotope sodium - 24 is used to determine the levels of electrolytes in the body . A 16microg sample of sodium - 24 decays to 2.0 mg in 45 h . What is the half - life , in hours , of sodium - 24 ?

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

Which change to the system wood cause the freely-moving piston to lower?

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation: