How do particles of solids, liquids, and gases differ?

Solids have a definite volume and shape, liquids have a definite volume but not shape, and gas has no definite volume or shape.

Solids- stuck together, hardly moving
Liquid- like solids, together but slide pass one another
Gases- are everywhere, they bounce back when they hit an end point 

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Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.