Sucre. De Wikidebrouillard.
Article incomplet en cours de rédaction Présentation de l'expérience Seriez-vous capable de faire brûler du sucre ? Nous y sommes parvenus. Matériel 3 petits pots en verre ou verres Du sucre en poudre De la cendre Un briquet ou des allumettes L'expérience L'expérience permet de mettre en évidence le rôle de la mèche dans une bougie. En vidéo La manipulation Faire trois tas, un sur chaque verre retourné : Un tas de sucre. Essayer de mettre le feu à chacun des tas. Que voit-on ? Un seul tas prend feu : celui qui mélange sucre et cendre. Explications Le sucre se caramélise : c'est une réaction de maillard. Caramélisation sur Wikipédia La cendre ne peut pas brûler seule (carbone uniquement). De manière simple Dans la réaction, la cendre ne peut pas brûler. On peut faire le même type d'expérience avec une bougie. Allons plus loin dans l'explication Pour une combustion, 3 éléments sont requis : combustible, comburant et une énergie d'activation : électricité, radiation, pression.
Rock Candy - How to Make Rock Candy Video. You don't have to visit a candy store to get colorful rock candy.
See how easy it is to grow your own sparkling (and tasty) rock candy crystals at home.See Transcript Hi, I'm Dr. Anne Helmenstine for About.com. Have you seen brightly colored rock candy in a store or used to sweeten a drink? Rock candy is simply sugar crystals. Rock Candy Ingredients The only two ingredients you need for rock candy are sugar and water, though you can add food coloring and flavoring if you want colored and flavored crystals. Prepare the Rock Candy Crystal Solution In a saucepan, heat at least three cups of sugar together with one cup of water. While the sugar solution is cooling, prepare a container for growing your rock candy. Growing Rock Candy Crystals Pour the sugar solution into your jar. You'll start to see crystals growing in a day or two. BAM! Sugar Is Not as Sweet as You May Think. You may think of sugar as purely a sweet ingredient meant for baking, but it can actually be a deadly explosive, according to PopSci's Gray Matter: "In 2008 the sweetener killed 14 people in Georgia -- not from diabetes or heart disease, but in a violent explosion.
Absence of regulation, ineffective enforcement, and lack of preparation for the potential danger led to the Imperial Sugar factory disaster, one of the worst industrial accidents of our time. Any substance that burns at all can be made to burn bigger and faster by increasing its surface area, thus increasing its access to oxygen. Fine powders can have very large surface areas, making materials such as flour and sugar, which barely burn when in bulk form, explosive enough to demolish a factory.
" Want to test it yourself? The experiment is simple: "To demonstrate the awesome power of confectioners' sugar, I blew a stream of it over a candle flame, creating a two-foot-long burst of fire. Ice. TO SURVIVE. Dry Ice. Dry Ice Hash. Glace carbonique achat. Glace Carbonique (Carboglace) - Articles pour Bar. 1000_SciencesLAB. EXPERIENCES. Top 10 quirky science tricks for parties. Exploding Pumpkin- Halloween Science Chemistry Demos! BBC Man Lab - Whiskey Cloud Of Peace - James May & Oz Clark.