Thermal expansion refers to the tendency of matter to increase in volume or size when its temperature is raised. This property is observed in most solids, liquids, and gases and is not exclusive to a specific type of chemical bond or chemical compound. Therefore, thermal expansion is not considered a chemical property.

Chemical properties, on the other hand, are intrinsic characteristics of substances that describe how they react, transform, or interact with other substances through chemical processes. These properties involve changes in the chemical composition and formation of new substances.

Key points to consider:

-Thermal expansion is a physical property related to the change in physical dimensions or volume of a material due to temperature changes.

-Chemical properties involve changes in the chemical structure, composition, and identity of substances through chemical reactions.

-While temperature can affect the rates and mechanisms of chemical reactions, it does not directly define chemical properties.

Therefore, thermal expansion is not a chemical property, but a physical property that describes how the volume of a substance changes in response to temperature variation.