Hydrogen Bubbles - Little Shop of Physics

The video tutorial explains an experiment involving electrolysis. It begins by listing the materials needed, including a bottle with a sports cap, 9-volt batteries, and stainless steel nails. The batteries are connected in series to the nails, which are submerged in water mixed with Borax, an electrolyte that enhances conductivity. The process of electrolysis is described, where electricity splits water into hydrogen and oxygen, forming bubbles. These gases can be ignited to demonstrate a chemical reaction.

What gases are produced at the electrodes during the experiment?

How can the mixture of hydrogen and oxygen be ignited?