Physical changes alter the size, shape, or form of matter but do not create new substances, and can often be reversed, such as freezing and melting water or chopping celery. Chemical changes result in new substances through molecular rearrangements that cannot be undone, like rust forming on nails, fireworks exploding, or cookies baking. Chemical reactions exhibit telltale signs like producing gas, releasing heat, forming precipitates, or causing color changes.

1. Physical Vs Chemical
Change
Mrs. Solda
6th Grade Science

2. Physical Change
In a physical change matter may change
size, shape, or form.
In a physical change no new substance is formed.
Physical changes can be undone or reversed (in many
but not all cases).

3. Examples Of Physical
Change
Folding paper into a paper airplane
Chopping celery
Ripping a piece of paper
Freezing water
Melting ice

4. Chemical Change
In a chemical change, matter changes and a new
substance is formed.
Chemical changes cannot be undone.

5. Examples Of Chemical
Change
Nail rusts
Fireworks on the 4th of July
Burning logs
Baking cookies
Mixing baking soda and vinegar

6. Signs Of A Chemical
Reaction
Gas is produced.
Heat is produced.
A precipitate (solid) is formed.
A color change occurs.