In present mini review the definition of new scientific trend "chemical mesoscopics", which is based on the ideas of the mesoscopic physics (mesoscopics) and also more latest mesoscopic chemistry, is given. This new scientific trend includes quantum notions on mesoparticle reactivity in chemical reactions. In these cases the negative charges quants interactions (interference) are considered as well as the interactions of negative and positive charges (annihilation). The schemes of the chemical bonds formation at the reactions flowing into mesoscopic reactors are presented. The especial attention is devoted to the interactions of metal (Copper, Nickel) carbon mesoparticles with such oxidizers as Ammonium Polyphosphate and Aluminum Oxide. In these reactions it is observed the reduction of Phosphorus and Aluminum, the growth of mesocomposite metal atomic magnetic moment and the simultaneous increasing of spin quantity on the mesocomposite carbon shell. The introduction of "annihilation" notion explains the increasing of magnetic characteristics. The modification of polymeric materials (on example of epoxy resins) by metal carbon mesocomposites is considered. For the mesoparticle (nanostructures) reactivity estimation the proposals are done. These proposals are concluded in the using of Fractal Theory ideas (Kolmogorov -Avrami equations) together with energetic analogs of reactivity theory.