Which option is an example of a chemical property? 1. boiling point 2. color 3. reactivity 4. density

Option (3) is the correct answer.

Explanation:

A property which does not bring any change in the chemical composition of a substance is known as physical property.

For example, shape, size, mass, volume, density, boiling point, melting point etc of a substance are all physical properties.

Whereas a property which changes the chemical composition of a substance is known as chemical property.

For example, precipitation, reactivity, toxicity etc are chemical property.

Thus, we can conclude that out of the given options reactivity is an example of a chemical property.

gravity causes stares to cluster i think so