3 chem multiple choice

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.

Which type of reaction always has an element and a compound as reactants

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?