Demonstrations

Changes of state include physical transformations of a substance among gas, liquid, and solid states and therefore include melting, freezing, boiling, condensation, and sublimation

            Collapsing Can

            Purification of a Liquid by Distillation

            Soxhlet Extraction of Coffee

Chemical changes are changes in a substance that result in new substances being formed by the making and breaking of bonds between atoms of the substance

             Decomposition of Ammonium Dichromate

Physical changes are changes in a substance that result in no new substance being formed;  physical changes are usually changes of state

            Liquid Carbon Dioxide