1. Physical and Chemical Changes

2. Observing involves seeing, hearing, tasting, touching, and smelling. Physical property- are characteristics of materials that can be observed or measured without changing the material. Physical Properties Physical Properties and Changes

3. Examples of Physical and Chemical Properties.

4. Concept of Change Change: the act of altering a substance

5. Physical Change Physical change: a change that occurs that does not change the identity of the substance  Melting ice (change in state or phase)  Freezing Kool-aid  Tearing paper  Boiling water (same as melting ice)

6. Chemical Changes Chemical change: a change that occurs causing the identity of the substance to change  Burning  Digesting food  Reacting with other substances A chemical change is called a chemical reaction NOT reversible

7. Chemical Changes Cont’d Indicators of a chemical change: Emission of light Production of heat Production of a gas Color change Formation of a precipitate  **Mg**

8. Is it Physical or Chemical? ChangePhysicalChemical Melting cheese Burning wood Milk souring (Do all students relate to this?) Wadding up paper Bicycle rusting

9. Comic Strip, Labeled Drawing, or Children’s Book Use pages D26 – D30 of the yellow science textbook to create a comic strip, labeled drawing, or children’s book of ALL of the families of elements of the Periodic Table including details of each family. Metals Transition metals Alkali metals Alkaline earth metals Halogens Noble gases