Bubbles are released when nitric acid is added to a potassium carbonate solution. What is the net ion

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?

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon

Just on number 2 (all parts), and if you do answer explain in detail