Atom - Smallest part of an element that still retains the characteristics of the element., Element  - A substance which cannot be broken down into any other substance., Solid - Particles tightly compacted, fixed volume and shape., Liquid - Particles free to move over each other. Fixed volume, take shape of container., Gas - Particles moving spaced far apart, move in straight lines. No fixed volume or shape. Easily compressed., Molecule - Two or more atoms chemically combined., Compound - Two or more elements chemically combined., Mixture - Two or more substances mingled together and can be easily separated., Conservation of mass - In a closed system, the mass before is the same as the mass after a chemical reaction. No atoms are lost or made. ,

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