Oxadition number of carbonic acid

How many ions that have a +1 charge will bond with an ion that has a -2 charge

Which is true of the reactants in this displacement reaction? fe + 2hcl fecl2 + h2 a. the reactants are located to the left of the arrow in the chemical equation. b. the reactants contain 1 iron atom, 2 hydrogen atoms, and 1 chlorine atom. c. the reactants are the atoms, molecules, or compounds formed in the reaction. d. the reactants have the same physical and chemical properties as the products.

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis