Chrome Alum Crystal

Chrome alum or chromium alum is a safe salt that produces dark, purplish crystals. Key Takeaways An alum is a type of chemical compound with the general formula XAl(SO4)2·12H2O, where X is a monovalent cation such as potassium or ammonium Alum crystals form octahedral shapes in their purest form Mixed Chrome Alum crystals consist of potassium alum (KAl(SO4)2·12H2O) mixed with chrome alum (KCr(SO4)2·12H2O)… Continue reading Chrome Alum Crystal

Bromine Aluminum Reaction

When bromine is introduced into a reaction vessel containing pieces of aluminum foil, a dramatic reaction occurs. Key Takeaways The following reaction occurs: 2 Al(s) + 3 Br2(l) ==> 2 AlBr3(s) The reaction is highly exothermic so that a huge part of the reactants is lost. Sparks from burning aluminum and bromine vapor are everywhere! Equipment &… Continue reading Bromine Aluminum Reaction

Classic Thermite Reaction

A thermite reaction is a really good example of a redox reaction in action! Here is how to do the classic demo: Key Takeaways Fe2O3 (s) + 2 Al (s) → Al2O3 (s) + 2 Fe (s) The reaction needs high activation energy. Once it is running it becomes self-sustaining Thermite reactions produce an extreme… Continue reading Classic Thermite Reaction

How to make Purple Smoke

Smoke is generated in a lot of chemical reactions, but have you ever created purple smoke? Here is how! Key Takeaways This experiment deals with toxic chemicals, use proper Protection The purple “smoke” is actually no smoke, but iodine vapor During the reaction, a lot of heat is produced and occasionally sparks can be seen… Continue reading How to make Purple Smoke