Résine urée-formol
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Your demonstrations are presented in an incredibly simple, scientific way that makes them a lot of fun to watch.
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si elle se faisait en milieu legerement basique (ph=8-9)on fabriquerait de la colle que l on utilise dans l industrie du bois .
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c'est une prise en masse car la reaction se fait en milieu acide. en effet le formol etant a un ph de 4.
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no la reaction est exothermique
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J'y pense que c'est une réaction endothermique avec le metal est l'Urée refroidit
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Exothermic. In practice, they add formaldehyde liquid to urea crystals, mix until dissolved & clear, then add a bit of conc. sulphuric acid perhaps as a catalyst. A dehydration reaction.
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who are you calling a douche!!!*
*it was a joke douche
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Well some folk on here think it's super fast setting, it's not.
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Theres A really easy way to do this
1. Buy a bottle of figi water
2. Leave it in the freezer for 3 hours (It wont freeze! unless you bump it!
3. take it out and and bang the bottom of it on a hard surface sharply!
4.Instant freeze!
Just search up water freezing if you dont believe me!
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your a douche
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Man, I wish you could speak English, cause somebody's gotta explain this...
RachaelPie 4 years ago 25
put your fingure in next time
Calderoh 4 years ago 12