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Physical and Chemical
Changes
Class Notes
Also found at
www.newburghschools.org/bgraham
Physical Change occurs when a
substance changes in shape,
size, or state of matter, BUT it
remains the same substance.
Ex: Tearing a piece of paper, melting ice
evaporating alcohol, crushing chalk.
Phase changes are always PHYSICAL!
What are the 6 phase changes?
Chemical Changes
Occurs when One or more substances
combine or decompose to form a
NEW substance. Elements combine
and recombine, breaking and/or
forming new bonds.
Ex: burning wood, baking bread, rusting
metals, fire works exploding
Comparing Physical and
Chemical Changes
4 Evidences of Chemical
Changes
1. Color change
2. Gas is produced
- bubbles, odor, explosion
3. Temperature change
-Exothermic- Gives off Heat
-Endothermic- Absorbs heat
4. Precipitation: a solid is formed
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