from chemToddler
D2O, colloquially referred as heavy water, is normal water (H2O) highly enriched in the hydrogen isotope deuterium, which is twice as heavy as normal hydrogen. Deuterium oxide (D2O) it is about 11% denser than water, but otherwise, is physically and chemically similar. This video nicely explains this heavy water term.
YOUCHEMISTRY
FOR EVERYONE WHO FREAKS OUT WITH CHEMISTRY AND SCIENCE IN GENERAL...
3 Mar 2012
29 Feb 2012
Lightbulb in liquid nitrogen
from TheBlueginjava
A bare wolfram lightbulb filament in a beaker of liquid nitrogen can be connected to an electric current safely and without decomposition of the filament, shining as a normal lightbulb. The liquid nitrogen is a non conductive and almost inert material that isolates the wolfram filament from the atmospheric oxygen that would burn it out. The video explains it very well!!
A bare wolfram lightbulb filament in a beaker of liquid nitrogen can be connected to an electric current safely and without decomposition of the filament, shining as a normal lightbulb. The liquid nitrogen is a non conductive and almost inert material that isolates the wolfram filament from the atmospheric oxygen that would burn it out. The video explains it very well!!
Labels:
ELECTRICITY,
NITROGEN,
WOLFRAM
25 Feb 2012
Liquid Nitrogen Explosion
Steve Spangler Science
Liquid nitrogen (boiling point -196 ºC) evaporates very quickly (explosively) in contact with hot water....
Liquid nitrogen (boiling point -196 ºC) evaporates very quickly (explosively) in contact with hot water....
Labels:
NITROGEN,
PHASE CHANGES
Brainiac Alkali Metals
from scientist303
Alkali metals react with water reducing its protons to H2(g) and leaving an alkaline aqueous solution due to alkali metal hydroxide formation. When going down in the group from lithium to cesium the alkali metals give its electrons to the protons of water more easily and the reaction goes faster. As the reaction release heat, if this heat cannot be dissipated quickly enough the hydrogen released will get ignited, sometimes very violently, and react with atmospheric oxygen forming water again.
M(s) + H2O(l) = M(OH)(ac) + 1/2 H2(g) + lots of energy(*)!!...
H2(g) + ½ O2(g) + ignition energy(*) = H2O (g)!! + lots of energy!!...
Alkali metals react with water reducing its protons to H2(g) and leaving an alkaline aqueous solution due to alkali metal hydroxide formation. When going down in the group from lithium to cesium the alkali metals give its electrons to the protons of water more easily and the reaction goes faster. As the reaction release heat, if this heat cannot be dissipated quickly enough the hydrogen released will get ignited, sometimes very violently, and react with atmospheric oxygen forming water again.
M(s) + H2O(l) = M(OH)(ac) + 1/2 H2(g) + lots of energy(*)!!...
H2(g) + ½ O2(g) + ignition energy(*) = H2O (g)!! + lots of energy!!...
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