Chemistry Mixtures and Pure Substances

Mixtures

Blend of two or more kinds of matter, each of which retain its own identity and properties. **Can** be separated by physical means. ex) salt water, muddy water, blood

homogeneous mixtures

Uniform in composition (evenly distributed); contains two or more substances, each of which retain their own properties. Also called solutions. Can be physically separated ex) bronze, brass, salt water, air, etc.

Heterogeneous mixtures

N**ot** uniform throughout, have phases which are parts of a mixture unlike other parts. contains two or more substances, each of which retain their own properties. Can be physically separated. ex) Muddy water, salsa, etc.

Pure substances

Has a fixed composition, every sample of one has the same characteristic properties too. Can **not** be separated by physical means. most elements are pure substances, ex) gold, copper, oxygen

Elements

Made of just one kind of atom. Pure substance, can not be separated by physical or chemical means ex) copper, sulfur, etc.

Compounds

Made of two or more **different** elements (atoms) that are chemically bonded. Atoms lose their original properties. Pure substance, can not be separated by physical means but CAN be separated by chemical means ex) water, salt