Do Now: Keep your notebook, and chapter homework at your desk. (these will be collected) Keep your notebook, and chapter homework at your desk. (these will be collected) Move all other books, bags notes to the front of the room Move all other books, bags notes to the front of the room Sit spaced apart. Sit spaced apart.

Change Chemistry is the study of materials and the changes they undergo. Chemistry is the study of materials and the changes they undergo. Chemists classify change into two types: Chemists classify change into two types: Physical change Physical change Chemical change Chemical change

Physical changes Definition Definition The molecular (chemical) compostion of the material remains unchanged. The bulk sample of material can be torn, deformed, and change states (solid, liquid, gas) but still retains essentially the same physical properties (odor, color, etc) The molecular (chemical) compostion of the material remains unchanged. The bulk sample of material can be torn, deformed, and change states (solid, liquid, gas) but still retains essentially the same physical properties (odor, color, etc) Evidence Evidence The bulk sample of material can be torn, deformed, or change states (solid, liquid, gas) but retains essentially the same physical properties (odor, color…) The bulk sample of material can be torn, deformed, or change states (solid, liquid, gas) but retains essentially the same physical properties (odor, color…)

Chemical Changes Definition Definition Molecular structures are changed. The chemical composition of the material is fundamentally changed Molecular structures are changed. The chemical composition of the material is fundamentally changed Evidence Evidence Color change Color change Formation of a new state of matter, at the same temperature Formation of a new state of matter, at the same temperature Generation of heat, light, or other energy Generation of heat, light, or other energy

Chemical Change (continued) Formation of a precipitate (Solid from solution) Formation of a precipitate (Solid from solution)