Classification of Matter A quick review

Matter Anything that has mass and occupies space

Matter can be classified 2 ways Pure Substances Mixtures

Pure Substances Contains one type of substance Has a fixed uniform composition Has the same properties Two types of pure substances Elements Compounds

Elements Contain only one type of atom Can not be readily broken down into simpler substances Atoms have known properties

Compounds Two or more elements chemically combined Can not be separated by a physical process The elements are joined together in a fixed ratio Have know properties

A slight difference A molecule is a substance that has two or more atoms bonded together. The can be atoms of the same element Elemental oxygen exists as a molecule, O2 Compounds are two ore more different elements combined in a fixed ratio.

Mixtures Mixtures do not have fixed composition Mixtures do not have set physical properties Mixtures can be separated by a physical process into component parts http://www.youtube.com/watch?v=cL6I1O1YHH0 Filtering Distilling Manually

Heterogeneous Mixtures In a Heterogeneous mixture the parts are different from each other One area is different than another

Homogeneous Mixtures Contain more than one type of substance The substances are evenly distributed - the same throughout

Specific types of Mixtures Solutions Solutes dissolved in a solvent Homogeneous with small particles Colloids Heterogeneous with intermediate particle size Exhibits the Tyndall effect Suspensions Heterogeneous with large particles