Matter that is made up of only one kind of atom Two or more kinds of atoms that are bonded together Two or more kinds of different atoms that are bonded together The basic unit of matter All compounds are molecules, but not all molecules are compounds.

Color, smell, boiling point, melting point, infra-red spectrum, magnetic, viscosity, density, etc… Heat of combustion, reactivity with water, PH, etc…

MATTER Can it be physically separated? Homogeneous Mixture (solution) Homogeneous Mixture (solution) Heterogeneous Mixture Compound Element MIXTURE PURE SUBSTANCE yesno Can it be chemically broken down into smaller pieces? noyes Are the parts of the mixture hard to tell apart? noyes

MATTER Can it be physically separated? Homogeneous Mixture (solution) Heterogeneous MixtureCompoundElement MIXTUREPURE SUBSTANCE yesno Can it be chemically broken down into smaller pieces? noyes Are the parts of the mixture hard to tell apart? noyes ColloidsSuspensions

Pure Substances Element –composed of one kind of atom –EXAMPLE: copper wire, aluminum foil

Pure Substances Compound –composed of 2 or more atoms bonded together –properties differ from those of individual atoms –EXAMPLE: table salt (NaCl) Courtesy Christy Johannesson

Combination of two or more pure substances that are not bonded together. HeterogeneousHomogeneous Mixtures

Solution –homogeneous –very small particles –particles don’t settle –EXAMPLE: rubbing alcohol Mixtures

Heterogeneous mixture –Medium to very large particles –relatively easy to separate –EXAMPLE: candy Mixtures

Colloid –heterogeneous –medium-sized particles –particles don’t settle –EXAMPLE: milk Mixtures

Suspension –heterogeneous –large and small particles –particles settle –EXAMPLE: fresh-squeezed lemonade Mixtures

Practice Time… Examples: –graphite –pepper –sugar –paint –juice element heterogeneous mixture compound homogeneous mixture (solution) heterogeneous mixture

Examples: –mayonnaise –muddy water –fog –saltwater –Salad dressing colloid suspension colloid solution suspension More practice…