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Elements
pure substances made of only one type of atom (same number of protons in the nucleus)
pure = the same the whole way through
Molecules
small particles made of two or more atoms which are chemically bonded
-> to form a specific, separate particle
a molecule is the smallest unit of a chemical compound that retains all the chemical properties of that compound
Compounds
consists of at least two different elements that are chemically bonded
must be a fixed ratio -> repeating pattern
all compounds are molecules but not all molecules are compounds
Mixtures
substance made from two or more substances which are mixed but not chemically joined
homogene-ous mixtures
uniform composition throughout and typically exist in one phase
heterogene-ous mixtures
non-uniform distribution of components consists of two or more phases
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