Final answer:
H* ions move from the inner membrane through proteins to the outer membrane of the mitochondria to form an electrochemical gradient between the inner and outer membrane.
Step-by-step explanation:
The movement of H* ions from the inner membrane through proteins to the outer membrane of the mitochondria creates an electrochemical gradient between the inner and outer membrane of the mitochondria. This gradient is established by the pumping of hydrogen ions across the inner membrane, creating a greater concentration of the ions in the intermembrane space than in the matrix. The flow of hydrogen ions across the membrane, called chemiosmosis, occurs through a protein complex called ATP synthase.