1. Chemical Properties Physical Science Chapter 1.3

2. Objectives: Describe two examples of chemical properties. Explain what happens during a chemical change. Distinguish between physical and chemical changes.

3. Chemical Properties Comparing Physical and Chemical Properties You can observe physical properties without changing the identity of the substance. Chemicals properties are more difficult to observe. Characteristic Properties The properties that are most useful in identifying a substance are characteristic properties.

5. Chemical Changes and New Substances What Happens During a Chemical Change? A substance changes chemical properties. Signs of Chemical Changes Change in color Odor Production of heat Fizzing

7. Physical Versus Chemical Changes A Change in Composition Physical changes do not change the composition of a substance while chemical changes do. Reversing Changes Many physical changes are easily reversed But most chemical changes cannot easily be reversed.