50.1 MB (3.7 MB compressed)
5147 x 3404 pixels
43.7 x 28.7 cm ⏐ 17.2 x 11.3 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Copper reacting with silver nitrate, 3 of 3. US copper penny (1 cent coin minted in 1981) was put into a Petri dish. 0.2M solution of silver nitrate (AgNO3) was then added. Since copper is more reactive than silver, a single-displacement reaction occurred: Cu + AgNO3 -> Ag + Cu(NO3)2. In this sequence Photo 1 was taken before the solution was added. Photo 2 was taken after the coin had been in the solution for 1 min. Photo 3 was taken after the coin had been in the solution for 7 min. Note the solution becomes slightly bluish due to Cu2+ ions. Photo 3 of 3.
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