7. Which of the following can speed up the
rate of a chemical reaction?
A. removing a catalyst
B. lowering the temperature
C. lowering the reactant concentration
D. breaking up a reactant into smaller pieces

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

i think is conclusions.i think so