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by Science Photo Library
$30.00
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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
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Lemon clock. Two halves of a lemon being used to provide electrical current sufficient to power an electronic clock. The lemon is being used as an... more
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2 - 3 business days
Lemon clock. Two halves of a lemon being used to provide electrical current sufficient to power an electronic clock. The lemon is being used as an electrolytic cell, the electrolyte being citric acid. Four electrodes - two copper and two zinc - are placed in the lemon and connected together. Zinc atoms on the electrode are oxidised, losing two electrons per atom and dissolving into solution. The electrons pass through the wires to the copper electrode where they combine with hydrogen ions to liberate hydrogen gas. The movement of electrons between electrodes form the current.
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$30.00
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