Reactivity (chemistry)

In the chemical reactivity is the ability of a substance to undergo chemical reaction. It is neither a thermodynamic or a kinetic size, but a qualitative description for the stability or reactivity of a substance. Solid substances are classified as low reactive.

Examples:

If you want to describe the reactivity on physical quantities, it depends thermodynamically on the free enthalpy or Gibbs energy. These are simple terms how much energy is a substance for release available. This is a property of the substance.

The reactivity of the corresponding kinetic size at a reaction is called activation energy. This is roughly the energy that must be applied in order to " set in motion " a reaction and thus determines the reaction rate. So she answers the question: " In which time the energy is released in this reaction? ".