Matter - Anything that takes up space and has mass., Particle theory of matter - An explanation of what matter is made of and how it behaves., Mixture - Matter that contains 2 or more pure substances mixed together., Pure substance - Matter that contains only one kind of particle., Solution - A mixture that looks like a pure substance, but is a mixture of 2 or more pure substances., Mechanical mixture - A mixture with different parts you can see., Heterogeneous mixture - Same thing as a mechanical mixture., Homogeneous mixture - Same thing as a solution., Solid - A state of matter with a definite volume and shape., Liquid - A state of matter with a definite volume, no definite shape, and takes the shape of its container., Gas - A state of matter that has no definite volume or shape, and takes the shape of its container., Volume - A measure of the quantity of space occupied by an object., Chemistry - The study of matter and its changes., Element - A substance composed of atoms that have the same number of protons in their atomic nuclei. It cannot be broken down into simpler substances by chemical means., Compound - A substance formed by the chemical union of two or more elements in definite proportions, typically having properties different from those of its constituent elements.,

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