Which is expected to have high melting point : NH3 , (CH3)3N , PH3 and why​

Explain why scientists use shared characteristics to make cladograms.

How does the attraction between particles affect the ability of a solvent to dissolve in a substance

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?