1. Physical and Chemical Properties and Changes

2. Physical Properties
Physical properties are those that we can determine without changing the identity of the substance we are studying.
Examples of physical properties
Mass
Density
Volume
Color
Odor
State of matter
Texture

3. Chemical Properties
Describe the way a substance can change or react to form other substances.
These properties, then, must be determined using a process that changes the identity of the substance.
Examples:
Flammability-the ability of a substance to burn or ignite
Reactivity-the likelihood that a substance will undergo a chemical reaction

4. Physical and Chemical Changes

5. Physical Change
Affects one or more physical properties of a substance without changing the identity of the substance.
Change in size or volume
Change of state of matter
Dissolving

6. Chemical Change
One or more substances change into a new substance that has different properties.
The atoms are rearranged into something new.

7. Evidence of Chemical Change
Production of gas bubbles
Unexpected change in color or odor
Release of light, sound, or heat
Formation of a precipitate

8. Physical and Chemical Changes
Directions: For each picture, decide if it is a physical or chemical change and explain why.