2. mass: a measure of how hard it its to push or pull an object.
3.volume: the amount of space an object takes up.
4. density: the amount of mass in a certain volume of material.
5.physcal properties: a property that can be observed without changing the identity of a substance.
6.physical change: a change in size, shape, or state without forming a new substance.
7.solution: a mixture one substance dissolved in another so that the properties are the same throughout.
8.chemical change: a change in matter that produces a new substance with different properties from the original.
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