What do the numbers after the arrows represent?

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

i got you i did it ya know what it is just needing to fill this in for a quick task!

i am sorry but i need more information and a picture.