Final answer:
Physical properties like freezing point can be observed without altering a substance's composition, while chemical properties like flammability involve changing the substance's identity.
Explanation:
Physical properties of matter can be observed without changing the substance's chemical identity. Freezing point is an example of a physical property since it describes a state change without altering the substance's composition. In contrast, flammability, reactivity with water, and combustibility are examples of chemical properties as they involve chemical reactions and changes in composition.
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