In the original mixtures, test tube 1 contained magnesium and a zinc compound, and test tube 2 contained zinc and a magnesium compound. A similar relationship exists between test tubes 3 and 4 and between test tubes 5 and 6.
Compare what took place in each corresponding pair of test tubes. What general conclusion can you draw?

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.