Sure, your learners know water is made up of two molecules, but watching them separate helps the class see the construction like never before. This resource provides directions on how to build a simple electrolysis device using a nine-volt battery. Placing the device into a small amount of water causes bubbles to appear. Adding an acid-base indicator allows the class to see the changes that occur as the water molecules break apart.

Concepts

electrolysis, acids and bases, h2o, hydrogen bonds, chemical reactions, chemical properties, technology resources

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Instructional Ideas

• Have the class research electrolysis 
• Let the class determine the differences between the products of electrolysis and how to detect them

Classroom Considerations

• Requires an acid-base indicator such as phenol red, phenolphthalein, bromothymol blue, or cabbage juice indicator

Pros

• Videos show how to build and what to expect when doing the activity
• Provides directions on how to make the cabbage juice indicator

Cons

• It may be difficult for everyone in the class to see what is going on with the activity