Why does reactivity rise with temperature?

I was sitting by my grill and saw it rusting more where it gets very hot. I was thinking that "yeah - reactivity rises with heat". The parts made out of iron have reacted with oxygen in athmosphere.

Then i started to think why reactivity actually rise with temperature? The atoms have more velocity but they dont escape the surface. Is there some fancy quantum thing happening - where the tunneling distance propability rises with heat?

More heat > more movement of atoms > more opportunities for two components of a reaction to meet and react.
Simple as

>>16703052 (OP)
Uhh idk

>>16703052 (OP)
I guess the energetic vibration means more energy when molecules collide, and so there are more collisions that overcome the energy of activation of the reaction in question.

>>16703052 (OP)
Heat flakes the paint and burns off grease.
Ash, caramel and carbon attracts moisture which continues the corrosion after firing.

>>16703052 (OP)
Heat excites the atoms

>>16703052 (OP)
A hotter material will *tend* to have a greater overlap with the cross-section for a given reaction than a colder material (depending on the exact temperatures and the cross-section, it is, of course, possible for something to be so hot that the overlap with a reaction cross-section starts reducing).

>>16703052 (OP)
>but they dont escape the surface
wrong, not that it matters for your question
>Is there some fancy quantum thing happening
of course? some of that heat is electrons on higher energy levels, thus more likely to make friends with other electrons
of course if you heat stuff too high, the electron position probability cloud density gets even lower and you lose reactivity, in fact you start losing existing chemical bonds