mixtures - can be separated by physical methods; substances within a mixture retain their individual physical properties, homogeneous mixtures - uniform in composition and properties; also known as solutions, heterogeneous mixtures - a mixture with a non-uniform composition, elements - pure substances made of only one type of atom; cannot be broken down into a simpler type of matter by physical or chemical means, compounds - pure substances that are formed from two or more different types of elements that have been combined chemically in fixed proportions (fixed ratio), acids - aqueous solutions with a pH <7; stronger the acid the lower the number; feel rough, bases - aqueous solutions with a pH >7; greater the number the stronger the base; feel slippery,

8th gr Classification of Matter

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