2. Pick the one word that completes both of these sentences: This lesson is about speeding up chemical reactions. Some reactions occur very slowly, but
chemicals called
can be added in order to make them
happen faster. The elephant's toothpaste demonstration relies on

yes they ca   is ur ansswerrr

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !