Experiment of December 9, 2016:

The time to submit an answer is over. You can now view the solution of the experiment.

Solution video:

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Experiment:

Question:

What does Mrs. Santa observe after 20-30 minutes?

A) Nothing at all happens.

B) The copper coins now have a silvery metal coating.

C) The nail now has a red or copper-coloured metal coating.

D) Tiny bubbles rise from the nail, but neither nail nor coins change their colour.