September 2011
9 posts
5 tags
Depletion Interactions
Depletion interactions lead to an attractive force between surfaces due to the presence of smaller non-adsorbing particles. The force is due to an osmotic pressure gradient between the region near the surface (depleted with respect to particles) and the bulk liquid.
Picture a surface in contact with a suspension of small particles (radius r). The particle centers can’t get any closer than r away...
Colligative Properties
If you want to boil water you have to put enough thermal energy in to separate the water molecules from one another. The heat is breaking the intermolecular bonds that hold the liquid together. If you dissolve something in water the boiling point goes up; what is the extra energy needed for? When you boil off some water as steam the remaining solution is more concentrated. At its simplest...
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1 tag
WatchGlass transitions in candy
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WatchHow to make a plot of larger data sets using Excel
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Watch
How to draw a scatter plot of scientific data in Excel
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Watch
A short video demonstration on how to use Excel to do simple scientific calculations.
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WatchA short video demonstration on how to format a simple table of scientific data.
