3 Q's

Recently I have learned the voltaic cell in my AP Chemistry class. I learned about being spontaneous and non spontaneous cells and how they react and function.I learned about the battery and how non-spontaneous reactions need a source of energy to balance their electrons. I just completed a lab on bones and finding out which ones which by clues. And also a lab on the electrolysis of water. which we concluded to be non spontaneous and it required a battery to produce the gases. I hope to do good on my retakes for chemistry.