How can we separate the hydrogen from the oxygen #H_2O#?
One method is through electrolysis - using an electrical current to separate the hydrogen and oxygen.
One method is through electrolysis.
Electrolysis = "the passage of an electric current through an electrolyte with subsequent migration of positively and negatively charged ions to the negative and positive electrodes" (http://www.dictionary.com/).
This decomposes the water into oxygen gas (
The electricity enters the water at the cathode - a negatively charged terminal, and passes through the water and exists via the anode - the positively charged terminal.
The hydrogen is collected at the cathode and the oxygen is collected at the anode.
The resulting products are very pure and is a reliable, yet expensive method.
Hope this helps :)