I was watching a video which explains how the first battery, the voltaic pile, was thought. The video starts with the host showing that if you put zinc in vinegar it starts to create bubbles and starts dissolving. Even though my bad chemistry background I quite understood the process involved in this phenomenon/reaction. Vinegar has hydrogen ions which requests electrons from the zinc who is happy to give them, so the zinc starts to dissolves while hydrogen ions are transformed into hydrogen gas and bubble are fromed. This is the short easy story that suits perfectly for my chemistry level. After this first experiment, the host proceed with the video showing that if you attached the zinc to a piece of copper though a conductor and again immerge both the the zinc and the copper in vinegar, now bubbles start to form around the copper and not around the zinc. Why is that so? Why the zinc doesn't give his electrons immediately right to the hydrogen ions in the vinegar (as before) but instead it passes them through a conductor to the copper which indeed pass them to hydrogen ions. I hope I made my doubts clear , I'm really craving for some help.
Link to the video:https://www.youtube.com/watch?v=8jlMuBn6Zow&t=29s