Please help, didn’t study, quiz is timed

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?

The identities of substances are the same before and after which type of change

What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm