from chemToddler
I have never seen this typical lab demonstration so well performed!!....the most amazing thing is that this grouse black polymeric sulfur goes back to its yellow powdery S8 form if you give it some time...
25 Feb 2012
23 Feb 2012
SUGAR AND KClO3
from nuclearrabbit
Under thermal conditions or ignited by sulfuric acid, KClO3(s) decomposes to KCl(s) and 3/2 O2(g), which is a disproportionation reaction. The O2(g) generated oxidises very quickly carbohydrates as sucrose, C12H22O11(s,) liberating lots of heat, CO2(g) and H2O(g)...the presence of a bit of CuCl2(s) gives the bluish colour to the flames...very spectacular!!...
Under thermal conditions or ignited by sulfuric acid, KClO3(s) decomposes to KCl(s) and 3/2 O2(g), which is a disproportionation reaction. The O2(g) generated oxidises very quickly carbohydrates as sucrose, C12H22O11(s,) liberating lots of heat, CO2(g) and H2O(g)...the presence of a bit of CuCl2(s) gives the bluish colour to the flames...very spectacular!!...
21 Feb 2012
Conductivity of Glass
from NatSciDemos
Insulating glass becomes a conductor of electricity when heated with a blowtorch.
At the beginning I thought it was a fake as when heating the remains of the broken bulb, the two metallic filaments inside it were put into contact again. However, the changes observed on the intensity of the working bulb when changing the temperature of the "glass switcher" make me thought that this is well real!!
Two ceramic lightbulb sockets are wired in series to a household AC power cord. When two incandescent bulbs of the same Wattage rating are screwed into the sockets and the cord is plugged in, they both pass the same amount of current and so they both light with the same intensity. When one bulb is unscrewed, the circuit is broken and the other bulb goes out. If we can replace the missing bulb with a conductive material, the circuit will once more be complete and the remaining bulb will light again.
Insulating glass becomes a conductor of electricity when heated with a blowtorch.
At the beginning I thought it was a fake as when heating the remains of the broken bulb, the two metallic filaments inside it were put into contact again. However, the changes observed on the intensity of the working bulb when changing the temperature of the "glass switcher" make me thought that this is well real!!
Two ceramic lightbulb sockets are wired in series to a household AC power cord. When two incandescent bulbs of the same Wattage rating are screwed into the sockets and the cord is plugged in, they both pass the same amount of current and so they both light with the same intensity. When one bulb is unscrewed, the circuit is broken and the other bulb goes out. If we can replace the missing bulb with a conductive material, the circuit will once more be complete and the remaining bulb will light again.
18 Feb 2012
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