Which property describes the ability of a substance to undergo a chemical reaction?

The property that describes the ability of a substance to undergo a chemical reaction is reactivity. Reactivity refers to how easily a substance can participate in chemical changes and interact with other substances to form new products. This can involve various types of chemical reactions, such as combustion, oxidation, or acid-base reactions.

In contrast, solubility measures how well a substance dissolves in a solvent, density refers to the mass per unit volume of a substance, and conductivity indicates the ability of a substance to conduct electricity. While these properties are important in chemistry and can influence how substances behave, they do not directly describe the potential for a substance to engage in chemical reactions like reactivity does.