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When red-orange mercury(II) Iodide (HgI2) is heated, it undergoes a phase transition at 126°C to a pale yellow form. As the heated sample cools, it gradually returns to the original red-orange color.
When red-orange mercury(II) Iodide (HgI2) is heated, it undergoes a phase transition at 126°C to a pale yellow form. As the heated sample cools, it gradually returns to the original red-orange color.
When a piece of metal wire spelling the letters ICE is pulled apart, it deforms. When the wire is placed in hot water, it "remembers" its original shape, once again forming the letters ICE. (The memory metal used in this demonstration was provided by the Institute for Chemical Education.) A simulation of the processes at the atomic level is shown.
When a piece of metal wire spelling the letters ICE is pulled apart, it deforms. When the wire is placed in hot water, it "remembers" its original shape, once again forming the letters ICE. (The memory metal used in this demonstration was provided by the Institute for Chemical Education.) A simulation of the processes at the atomic level is shown.