PLEASE HELP

How do antibiotics kill invading bacteria but not human cells?

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

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?

Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n