Why is the law of conservation of mass true? a. all atoms at the start of a chemical reaction are present at the end of the reaction

b. All the molecules in a substance remain intact during a chemical reaction

c. The substances at the start of a chemical reaction gather more atoms to make up for those lost in the reaction

d. all molecules at the start of a chemical reaction are present at the end of the reaction

Aspirin has a density of 1.40 g/cm3 what is the volume in cubic centimeters of a tablet weighing 320 mg ?

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?

May someone me with these science questions