Two substances with crystal structures can be different even if the substances contain the same chemical elements in the same ratio. These substances have the same composition, but they are different because their atoms are arranged in different ways.

Question

Select the two models that represent substances with the same chemical formula but different arrangements of atoms.

C

Si



graphite diamond or silicon

Answer 1

The two models that represent substances with the same chemical formula but different arrangements of atoms are:

1. Graphite
2. Diamond

Both graphite and diamond are forms of carbon (C) and have the same chemical formula (C), but their atomic arrangements are different, resulting in distinct physical properties.

You also mentioned "silicon" but silicon (Si) is a different element altogether, so it is not a valid option when considering substances made of the same element with different arrangements.