1. Physical and Chemical Changes
A Teaching Demonstration
By
Patricia W. Stiles

2. Concept of Change
 Change: the act of altering a substance

3. Physical Change
 Physical changes occur when matter changes its
property but not its identity substance.
 Physical property changes could include a change
in: texture, shape, size, color, odor, volume, mass,
weight, and density.
 Melting ice
 Freezing kool-aid
 Tearing Paper
 Boiling Water

4. Writing Activity
 Each student will make a list of examples of
physical and chemical changes you notice
everyday.

5. Chemical Changes
 Chemical change: a change that occurs
causing the identity of the substance to
change
 Burning
 Digesting food
 Reacting with other substance
A chemical change is called a chemical reaction

6. Chemical Changes (Continued)
 Chemical changes are changes matter
undergoes when it becomes new or different
matter.
 To identify a chemical change look for signs
such as color change, bubbling and fizzing,
light production, smoke, and presence of
heat.

7. Is it Physical or Chemical?
Change Physical Chemical
Melting Cheese √
Burning wood √
Wadding up √
paper
Bicycle rusting √
Frying an egg √
Cutting grass √