from chempics
The reaction occurred is just the oxidation (redox reaction) of iron
4Fe + 3O2 = 2 Fe2O3 plus lots of energy
Iron need to be very fine divided (wool) to allow the combustion keep going (the activation energy burn iron is really high in comparison to other combustible materials as gasoline, wood or carbon) and as Fe2O3 is a solid (a normal burn, for instance of a piece of carbon, releases CO2 gas) the combustion result is heavier...
very nice experiment!!
23 Oct 2011
28 Jun 2011
COMPARING THE FOUR HALOGENS
from oulearn
Have a look especially to the reactions of bromine and iodine with aluminium...simply spectacular!!
Have a look especially to the reactions of bromine and iodine with aluminium...simply spectacular!!
29 May 2011
FRACTIONAL DISTILLATION
by lowlevelpanic999
(from wikipedia) Fractional distillation is the separation of a mixture into its component parts, or fractions, such as in separating chemical compounds by their boiling point by heating them to a temperature at which several fractions of the compound will evaporate. It is a special type of distillation. Generally the component parts boil at less than 25 °C from each other under a pressure of one atmosphere (atm). If the difference in boiling points is greater than 25 °C, a simple distillation is used.
(from wikipedia) Fractional distillation is the separation of a mixture into its component parts, or fractions, such as in separating chemical compounds by their boiling point by heating them to a temperature at which several fractions of the compound will evaporate. It is a special type of distillation. Generally the component parts boil at less than 25 °C from each other under a pressure of one atmosphere (atm). If the difference in boiling points is greater than 25 °C, a simple distillation is used.
24 May 2011
SUPERFLUID HELIUM
video from BBC documentary Absolute Zero and explanation from wikipedia
Superfluidity is a state of matter in which the matter behaves like a fluid without viscosity and with infinite thermal conductivity. The substance, which looks like a liquid, will flow uncontrollably, and also will be at exactly the same temperature throughout itself. Despite its lack of viscosity, the liquid still has surface tension which allows it to rise up the sides of its container without the normal restrictions of flow. This allows the liquid to "flow" up the sides of the container and over the top.
Superfluidity is a state of matter in which the matter behaves like a fluid without viscosity and with infinite thermal conductivity. The substance, which looks like a liquid, will flow uncontrollably, and also will be at exactly the same temperature throughout itself. Despite its lack of viscosity, the liquid still has surface tension which allows it to rise up the sides of its container without the normal restrictions of flow. This allows the liquid to "flow" up the sides of the container and over the top.
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