The three states of matter are: solid, liquid, and gas. Particles behave differently depending on what kind of matter it exists in. Solids are usually stable, with little less vibrations and energy than liquid and gas. Liquids are free-moving, and typically don't stay a certain shape unless within a container. Matter in the form of gas is pretty much everywhere, moving quickly at all times. These are the three main types of matter that makes up our world (well there's plasma but I guess we're not there yet).
Chemical Changes
Chemical changes occur at the molecular level. These changes always involve creating a new compound or substance from the original materials. These changes are difficult to reverse, or even impossible. Combustion is a type of chemical change, and you'd be hard pressed to "unburn" wood logs.
Physical Changes
Physical changes, in contrast with chemical changes, do NOT produce a new substance or compound. Typically, physical changes are changes in state (melting, freezing, etc) or shape (a bent spoon, for example). These changes are much easier to reverse than chemical changes.
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