In the experiment, which of the following observations would suggest that a solid sample is a mixture? The

• A.solid can be ground to a fine powder
• B.density of the solid is 2.25gdm^-3
• C.solid begins to melt at 573k but is not completely melted until 648k
• D.solid absorbs moisture from the atmosphere and turns into liquid
• E.solid melts at 300k