How many moles is 21.52 grams of water [H2O]?

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.

Why are the trends and exceptions to the trends in ionization energy observed?

What best discribes the relationship between wavelength and frequency in a electromagnetic wave