1. Physical vs. Chemical Change
Physical Change – occurs when one or more physical properties of a substance are changed; many physical changes can be undone by physical means. Example – folding paper

2. Physical Change Can easily be reversed
Do Not change into a different substance
Can change state (solid, liquid, gas, plasma)

3. Physical vs. Chemical Change
Chemical Change – Occurs when one or more substances are changed into new substances with different properties; cannot be undone by physical means. Example – Burning paper

4. Chemical Change Change in color may occur Change in smell
Produce a gas or a precipitate
Forms a new substance
Can NOT easily be reversed