How are prefixes used to name compounds? O A. A prefix is used only for the name of the second element in
covalent compounds.
B. Prefixes are used to tell how many of each kind of atom are in
covalent compounds.
C. Prefixes are used to tell how many of each kind of atom are in
ionic compounds.
O D. Prefixes are used to indicate the number of atoms in both covalent
and ionic compounds.

(answer is B) :)

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.

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b