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Atom
a single unit of matter that cannot be broken down chemically
element
A pure substance made from only one type of atom
molecule
two or more any type of atoms chemically bonded together
compound
pure substances made from two or more types of atoms
Mixture
Physical combination of two or more substances where each substance obtains its original properties and can be separated by physical means.
Heterogenous mixture
a type of mixture where the components are not uniformly distributed and can be easily distinguished (ex: pizza or chocolate chip cookie)
Homogenous mixture
a mixture that has a uniformly composition throughout, where the individual components are not easily distinguishable (ex: saltwater or air).
Pure substance
A material composed of only one type of particle