Which best represents a heterogeneous mixture? salt dissolved in water

hydrochloric acid

a mixture of oxygen gas and nitrogen gas

sand at the beach
ANSWER ASAP

Need on both questionswill markbr />

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?

Compare and contrast solutions and suspensions