You will need
- plastic bottles of 1.5 liters, a rubber ball, pot of water, potassium hydroxide or sodium hydroxide (caustic soda, sodium hydroxide), 40 cm wire of aluminium, a piece of zinc, a glass container with a narrow neck, hydrochloric acid, rubber bulb, 12 Volt battery, wire, copper, wire, zinc, glass jar, water, salt, glue, syringe.
Fill halfway with water plastic bottle. Throw in a bottle and dissolve in water 10-15 grams of sodium hydroxide or caustic soda. Put the bottle in a pot of water. Aluminum cut wire pieces at 5 inches in length, and throw it in the bottle. Put on the neck of the bottle a rubber ball. Released during the reaction of the aluminum with the alkali solution, the hydrogen will be collected in the rubber balloon. This reaction takes place with violent evolution of heat - be careful!
Pour into a glass container of hydrochloric acid, and throw it in her zinc. Put on the neck of a glass container with a balloon. Released during the reaction of zinc with hydrochloric acid hydrogen will be collected in a balloon.
Pour into a glass container of water and stir in 4-5 tablespoons of salt. Then push the syringe against the piston copper wire. Seal this place with glue. Lower the syringe into the vessel with the brine and pushing the plunger, fill the syringe. Connect the copper wire to the negative terminal of the battery. Down next to the syringe in saline solution zinc wire and connect it to the positive terminal of the battery. The reaction of the electrolysis of copper wire about hydrogen, which displaces the syringe from the saline solution, the contact of the copper wire with the brine interrupted, and the reaction will stop.