A physical change involves a change in the phases of matter, whereas a chemical change involves a change in chemical bonds.
Concept #1: Homogeneous vs. Heterogeneous Mixtures
Concept #2: Physical vs. Chemical Changes
In a physical change there is a change in matter as it goes from one physical state to another. In a chemical change atoms rearrange themselves to create a new substance.
Example #1: Which of the following represents a physical change?
a. Alkanes burn spontaneously.
b. The sublimation of CO2.
c. 2 H2 (g) + O2 (g) ----> 2 H2O (g)
d. The rusting of a car.