Students are introduced to the idea that matter is composed of atoms and molecules that are ... molecules as they experiment with and observe the heating and cooling of a solid, liquid, and gas.

Researchers have recently identified 'dark electrons'—electrons undetectable using traditional spectroscopy—within solid materials. By examining palladium diselenide, the team ...

Matter is the "stuff" that makes ... which means that eventually they are evenly mixed. For example, potassium manganate(VII) is a purple solid. If you put a crystal of it into a jar of water ...