Solid-Carbon Dioxide & surface tensions?

Question

What intermolecular force allows carbon dioxide to exist as a solid

and..

Does ethanol or water have more surface tension, and how could I use their molecular structures to explain it?

Answer 1

Since CO2 is a non-polar molecule, the only intermolecular force of attraction is London Dispersion force.

Water has a larger surface tension. Each water molecule can form more Hydrogen Bonds with other water molecules. Ethanol also form H-bonds, but not as many, so the intermolecular forces of attraction are not as strong.

Answer 2

water has more surface tension, but ethanol can fit in between the molecules a graduated cylinder to make less than the 2 added up.(50ml +50ml=about 95ml)

dry ice has to line up its molecules to crystal format. sublimation is interesting in CO2.

Answer 3

1) Surfactant to prevent alveoli collapsing inwards by reducing surface tension. 2) So gases can dissolve before diffusing into the capillary, as circulation can only transport liquid.