Bellringer State the law of conservation of mass. Mercury (II) oxide yields mercury + oxygen 216 g = 200 g + 16 g Mass of reactant = mass of products

Changes in Matter Objectives: 8.0 Distinguish among endothermic and exothermic physical and chemical changes. Other AOD C.8.4 Differentiate between chemical and physical changes of matter. Other AOD C.5.3 Describe phase changes in terms of energy absorption or release.

Physical Changes Def.: changes that alter a substance WITHOUT changing its composition. List some. Water and change of state Would melting point and boiling point be intensive or extensive physical properties?

Physical Changes (cont.) Consider the following terms: Endothermic Exothermic What would these terms mean? What would melting be? What would boiling be? What would freezing be? What would condensing be?

Chemical Changes Def.: involves on or more substances changing into new substances. List some. Signs of a chemical change: Color change Formation of gas Energy change (burning) Change in smell

Chemical Changes (cont.) Endothermic or exothermic? Baking bread Striking a match The glow of a firefly Photosynthesis Burning propane in a gas grill

Verbal Assessment & Assignment Section Assessment (p.65): 13, 14 Workbook (p.15): ALL