What defines a force divide by area

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

A characteristic common to both diffusion and active transport is that

How many moles of glucose are contained in 8.3 x 10^21 molecules of glucose

What is the name of the compound Ca (NO3) 2? A. calcium nitride B. calcium nitrate C. calcium nitrite D. calcium nitrile

If 3.22 moles of silver nitrate (AgNO3) are available for reaction, how many possible grams of copper nitrate (Cu (NO3) 2).

Which of these changes involved a physical change and not a chemical change?

Which of the following statements is true? Running an electric current through a magnet can create a magnetic field. Electric engines change electricity into magnetism. The strength of a magnetic field increases with distance.

valancy of x is 3 while that of y is 1. write a formula of the compounds when each of the seperaty combines with oxygen

The elements that contain electrons in an F sublevel near the highest occupied energy level are referred to as? A. Alkali metals B. Alkali earth metals C. transition metals D. inner transmission levels

A 5.91 g unknown sample analyzed by elemental analysis revealed a composition of 37.51 % C. In addition, it was determined that the sample contains 1.4830 * 1023 hydrogen atoms and 1.2966 * 1023 oxygen atoms. What is the empirical formula?