What happens to the free energy released as electrons are passed from photosystem ii to photosystem i through a series of electron carriers?

Iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

Any color picture tube and electric field exerts a net force of magnitude 1.68x 10^-13 n on an electron the rest mass of an electron is 9.11 x 10^-13 what is the electron acceleration?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?