Identify the statements that accurately describe how hydrogen ion concentration relates to energy production in oxidative phosphorylation.

1. ATP synthase forms a channel for hydrogen ions to enter the mitochondrial matrix and couples the energy gained from the diffusion of hydrogen ions to the release of ATP.

2. The pH in the intermembrane space is higher than the pH in the mitochondrial matrix.

3. ATP synthase provides energy in the form of ATP to actively transport H into the mitochondrial matrix.

4. Energy is generated as a result of the difference in hydrogen ion concentrationbetween the mitochondrial matrix and the cytoplasm.

5. Hydrogen ions enter the mitochondrial matrix via facilitated diffusion.

6. Hydrogen ion concentration is higher in the intermembrane space than in the mitochondrial matrix.