chemistry
posted by SORAN/IRAQ on .
IF WE HAVE TWO SUBESTANCE(A/B)THE MELTING POINT A IS 125 AND FOR B THE M.P IS UNKNOWN,HOW COULD KNOW WE WITH HERE A/B ARE THE SAME SUB.OR DIFFRENT

Take a mixed melting point. If A and B are in fact the same, the mixed melting point will be the same as the melting point of either.