Here is the video of the glistening crystals of lead iodide. The glistening crystals are formed during formation (as they are so thin) and by the bombardment with surrounding water molecules. #ChatChemistry, #ITeachChem @cleapss.bsky.social
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We are comparing the diffusion speeds of halogens along damp starch/iodide paper. This activity is conducted in Petri dishes on the bench. The final section shows iodine result and uses 1 tiny ball of iodine.
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Confusion abounds as to whether iodine sublimes or evaporates at 1 atm. In fact, it melts and flows. A little microscale triumph. See tinyurl.com/2nw2hram

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Here is a diffusing precipitate of silver iodide on a thermochromic plastic sheet so that the endothermic dissolving and the exothermic precipitation are seen.
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Making 1-5% soap solutions in 7:3 propan-2-ol/water. Filtered to get a colourless liquid. Laser light reflection indicates it is colloidal. Is the twinkling effect caused by collisions with water molecules?
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Newish approach to an old experiment as white phosphorus is no longer available. Red phosphorus is. It was the first use of bottle top in school chemistry as an inexpensive alternative to the crucible. @cleapss.bsky.social subscribers see PS67l Burning phosphorus in air
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We tried this after a Helpline call. "Is this still OK to do". Of course it is. It is also on edu.rsc.org/exhibition-c...
Our catalyst got so hot it vaporised. Clean the copper foil in acid beforehand and the reaction lasts nearly an hour.
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