Energy released by the electron transport chain is used to pump h⁺ into which location in eukaryotic cells?
a) cytosol
b) mitochondrial outer membrane
c) mitochondrial inner membrane
d) mitochondrial intermembrane space
e) mitochondrial matrix

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.