In the animated diagram below:
6.4.1 What is on the y-axis?
6.4.2 What is described on the x-axis?
6.4.3 What does the red curve represent?
6.4.4 What are the horizontal blue lines?
6.4.5 How would the HCl molecule’s vibration change if it moved from E3 to E4? From E3 to E2?
6.4.6 What is the main difference between the possible energies of a chemical bond versus energies of a spring?
By Darekk2 – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=22695164
Wikipedia Molecular Vibrations: https://en.wikipedia.org/wiki/Molecular_vibration