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OpenStudy (anonymous):
An iron nail (Fe) is placed into a solution of copper(II) sulfate (CuSO4). After some time, the blue color of the copper(II) sulfate disappears and some copper-colored solid (Cu) is found on the surface of the nail. The solution now contains iron(II) sulfate (FeSO4), and the container feels warmer than before the reaction. What do the colors indicate? Does this reaction absorb or release energy? How do you know?
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OpenStudy (anonymous):
energy was released
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