If you change the state of something, say, liquid to solid, is it a physical or chemical change?

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

If the concentration of phosphate in the cytosol is 2.0 mm and the concentration of phosphate in the surrounding fluid is 0.1 mm, how could the cell increase the concentration of phosphate in the cytosol? a) passive transportb) diffusionc) active transportd) osmosise) facilitated diffusion

Which factor is likely to impact the possible number of compounds ?