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 just found evidence of “dark electrons”—electrons you can’t see using spectroscopy—in solid materials ...

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 ...

Let's explore the three different states of matter using water. Water when you can pour it, like this, it's a liquid. When it's frozen, it turns to ice and that's a solid. And when it's heated ...