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This is written as a static display, but can easily be adapted to a hands-on experiment for learners to conduct.

Learners observe a sealed container holding a clear colorless liquid. They shake the container and the fluid turns blue. When allowed to sit for a few moments, the fluid turns colorless again.

Learners observe an electrochemical cell constructed from a small jar containing zinc and copper strips immersed in separate solutions. The strips are connected to a motor that turns a small fan.

This is written as a static display, but can easily become a hands-on experiment for learners.