Question

What happens to the concentration of H+ in the intermembrane space and the matrix as electrons move down the ETC?

Answer 1

In electron transport chain, the multiprotein structure pumps out H+ ions into the intermembrane space. As the H+ ions get pumped out, the concentration of H+ in the intermembrane space gets higher. As a result, H+ ions will start flowing down back to the chromosomes matrix through the ATP molecule.