a pure substance is made of only one kind of atom / molecule
one_of_chemical_elements is uranium. pure_substance is not inanimate_object. pure_water is pure_substance. pure_substance is inanimate_object. pure_water is oxide. anhydrous_ammonia is not pure_substance. atom is not substance. anhydrous_ammonia is pure_substance. pure_water is not pure_substance. atom is substance.