9/17 Notes start Midterms due tomorrow @ 3pm • Review Mothball Lab • Observed the _____________ of the mothball? • Did the atoms ever change? • What changed about the mothball?
Give me some physical properties of the object • Tell me some chemical properties of the object
Properties Review • 2 different types Read these examples
Changes • When it actuallychanges • Physical Change: changes size, shape, color, &/or state of matter (but its still the same thing) • http://www.youtube.com/watch?v=6egx7jHxmwM • same atoms • Chemical Change: changes what it completely is, chemical reactions REACTS • gummy bear • http://www.youtube.com/watch?v=uixxJtJPVXk different arrangement of atoms can’t get original atoms back
Property vs. Change • Property = description or could change in the future • Change = change • 5 evidences of a chemical change • PCOGT – “Pirates can obtain great treasures” • Precipitate (solid forms) • Color change • Odor(smell) • Gas forms • Temperature change • Evidence of a chemical change • http://resources.educ.queensu.ca/science/main/concept/gen/g09/N.%20Sabet/precipitation.jpg