¿Cuáles son los elementos químicos en el universo, en la corteza terrestre y en el cuerpo humano? Utiliza nombre y símbolo de los elementos

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

What is the relation between concentration of reactants and the rate of chemical reaction?

Ill give brainiestif one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated? if each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron? how many neutrons in total were produced by the two fission events described?