Question

physical and chemical changes - 7.6c
physical changes affect the—
a color of an object.
b chemical structure of an object.
c flammability of an object.
d observable properties of an object.

Explanation:

To solve this, we analyze each option:

• Option A: Color change can be due to chemical (e.g., rusting) or physical (e.g., mixing pigments) changes, so it's not exclusive to physical changes.
• Option B: Chemical structure change is a chemical change, not physical. Physical changes don't alter the chemical structure.
• Option C: Flammability is a chemical property, and changes related to it are chemical changes.
• Option D: Physical changes affect observable (physical) properties like shape, state (solid/liquid/gas), size, etc., without changing the substance's chemical identity.

Answer:

D. observable properties of an object