|Posted on Sunday, April 4, 2004 - 5:05 pm: || |
For a chemistry demonstration, I want to do the reaction of powdered aluminum and ground iodine. I can make the similar reaction work with zinc (powdered zinc + ground iodine, a couple drops of water as a catalyst. Purple cloud of sublimed iodine results), but I can't make the aluminum work. I can't figure out why the zinc would work and the aluminum would not: aluminum is more reactive. I've been doing the two experiments exactly the same (changing only the type of metal). The aluminum reaction is supposed to be stronger than the zinc one, even producing a flame.
|Posted on Saturday, May 15, 2004 - 10:40 pm: || |
From school days I remember that alluminum has a thin layer of aluminum oxide on the surface that prevents it (inhibits) from being extremely reactive.I have not tried it myself, but if a piece of alluminum was submerged in mercury (remember that mercury is poison and need good ventilation to keep vapors in check)and then scraped the surface with something sharp, murcury and alluminum will bond, after that alluminum exposed to water or air or other elements will be able to produce significant chemical reaction. Mercury can be found inside of some thermostats and thermometers. Hope it helps. Safety first.