Which of these is a chemical property of a substance? question 16 options: melting point density reactivity color

In 2002, the rare earth elements mine in mountain pass, california was closed because

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.

In which phase of mitosis do the spindle fibers pull the chromosomes apart to opposite sides of the cell ?