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Mixture
2+ pure substances, ratio may vary
Heterogenous mixture
nonuniform, visible differences
heterogenous mixture example
chocolate chip cookie (flour, sugar, eggs, chocolate chips, etc.)
homogenous mixture
uniform composition
example of homogenous mixture
milk
pure substances
unique fixed chemical and physical properties, fixed composition
law of definite proportions
a chemical compound always contains the exact same elements in the exact same proportions by mass, no matter where it comes from or how its made.
compound
2+ elements combine in a fixed ratio