They are different substances. They have the same weight. They have the same densities. They are different mixtures.
I gave my students this multiple choice question: If it is determined that the particles in one solid are arranged in a repeating pattern and the particles in another solid are arranged randomly, what must be true about the solids?

Only one answer is correct among these 4 choices:
- They are different substances.
- They have the same weight.
- They have the same densities.
- They are different mixtures.

Could you tell me which one is correct?

They are different substances.