Electricity is "created" when certain chemicals react
together. We use chemically- made electricity to power many
machines from flashlights to a watch or sometimes a car.
Yes, there are cars that run on electricity! The devices
that store electricity are called batteries. Electricity can
also be used to produce chemical changes.
Water is a simple chemical made from two gases -- hydrogen
and oxygen. Every molecule of water has two atoms of
hydrogen for every atom of oxygen. H2O is
the chemical formula for a molecule of water.
If an electrical current is passed through water between
electrodes (the positive and minus poles of a battery), the
water is split into its two parts: oxygen and hydrogen. This
process is called electrolysis and is used in industry in
many ways, such as making metals like aluminum. If one of
the electrodes is a metal, it will become covered or
plated with any metal in the solution. This is how
objects are silverplated.
You can use electricity to split hydrogen gas out of the
water similar to the process called electrolysis.
- A 9 volt battery
- Two regular number 2 pencils (remove eraser and metal part on the ends)
- Thin cardboard
- Electrical wire
- Small glass