Students are each given a 20 gram sample of an unknown solid compound in a clear plastic bag. they are instructed to break the material into smaller parts by gently hitting it with a hammer. some of the parts break into large chunks and some look like a fine powder. which statement correctly describes these broken pieces of the sample?

the pieces of fine powder are individual atoms.
the larger pieces are still compounds and the smaller pieces are elements.
each piece contains the same number of atoms.
each piece contains the same proportion of different elements.