Which category does the ion PO43- belong to?
A.
monatomic cation
B.
monatomic anion
C.
polyatomic anion
D.
polyatomic cation
E.
monatomic ion

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?