Unit 7: The Physical Behavior of Matter

    The universe is composed of energy and matter, and matter can be separated into four categories. Although there are millions of different types of materials, each composed of atoms, all matter can be described as an element, a compound, a homogeneous mixture, or a heterogeneous mixture. And all substances at a given temperature and air pressure can exist as a solid, a liquid, or a gas! 
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  Apr 4, 2014, 10:47 AM Joe Minutillo