RICHARD MEGNA / FUNDAMENTAL PHOTOS / SCIENCE PHOTO LIBRARY RICHARD MEGNA / FUNDAMENTAL PHOTOS / SCIENCE PHOTO LIBRARY
Electron displacement reaction. If a metal strip is placed in a solution of ions of a metal of lower electronegativity, the strip metal will displace the ions in solution. In this case, the metal strip is zinc (electronegativity = 3. The zinc loses electrons to form zinc ions, these displace the copper ions from solution by making them combine with electrons to form metallic copper. This creates a dark deposit of copper on the surface of the zinc strip and a loss of blue colour in the solution.
Model release not required. Property release not required.