Step 1: Materials

You will need:
2 Paper clips
1 9-volt battery
some water
a container

Step 2: Connecting the Paper Clips and the Battery

Bend the Wires so they will fit around the two connections of the Battery like the picture for this step.

Step 3: Filling the Container

fill the container with water.

Step 4: Begin!

Making sure the Wires aren't touching, put them into the water without getting the battery wet.

Step 5: The Outcome

Hopefully you will see that one clip has lots of bubbles on it while the other doesn't have many. if there isn't make sure the clip is touching the battery Lead. The clip with lots of bubbles has Pure hydrogen in the bubbles while the clip with not many has impure Oxygen in them.