Physical and Chemical Changes

Physical and Chemical Changes DGM Science

Create 2 Graphic Organizers Definition Definition Examples Examples Indicators Indicators Physical Change Chemical Change Illustration Illustration

Physical Change • Definition • Physical Change: change in a substance where there is a change in form (shape, size, state) but the identity remains the same.

Physical Change • Indicators of Physical Changes • a change in: texture, shape, size, color, odor, volume, mass, weight, and density. • Physical changes are predictable

Physical Change • Examples • Solid Water (ice) Melting • H20(s)  H20(l) • Liquid Water Boiling • H20(l)  H20(g) • Mixing

Chemical Change • Definition • Chemical Change : one or more substances combine or break apart (decompose) to form new substances • All chemical changes either release or absorb Heat • Products have different properties than reactants

Chemical Change • Examples • Combustion (burning) • Corrosion (rusting) • Decomposition (rotting)

Chemical Change • Indicators of Chemical Changes • Change in temperature • Unexpected change in color • Production of Light • Production of odor • Precipitate (making a new solid) • Fizzing and Foaming (making a new gas)

Physical or Chemical Change? • Blending a smoothie

Physical or Chemical Change? • Baking Cookies

Physical or Chemical Change? • Frying Bacon

Physical or Chemical Change? • Cutting Paper

Physical or Chemical Change? • Melting Steel

Physical or Chemical Change? • Making Steam

Physical or Chemical Change? • Grinding wood

Physical or Chemical Change? • Crushing a car

Physical or Chemical Change? • Chewing Food

Physical or Chemical Change? • Digesting food

Physical or Chemical Change? • Chain sawing

Physical and Chemical Changes