4. Iftwo objects have the same mass, what must be true? Choose the correct answer(s).
A. They have the same volume.
B. They are made of the same material.
c. They contain the same amount of matter.
D. They have the same density:

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explanation:

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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.