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Intermolecular Forces and Phase Change

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Intermolecular Forces and

Phase Change

by Kim Law and Alex Shames!(and Mr. Bennett)

http://www.youtube.com/watch?v=HTbrsx1zARs (Start at 0:40) Gecko feet have a large surface area because of all the hairs. Which IMF increases with surface area?

Scientists made a substance to mimic the properties of the gecko’s foot. What kind of properties should their material have?

Hint: Think about each liquid’s consistency. Is it slow moving or fast moving?

Honey

Oil

Resistance to deformation

Commonly thought of as thickness of liquids

More IMF = more viscous (think honey vs. water)

This marathon runner is ridiculously photogenic--probably because he’s staying nice and cool thanks to sweating. Why is that?

The olive oil and vinegar clearly don’t mix. Why can’t they just get along?

Here’s the structure of olive oil

Here’s the structure of vinegar

M&M’s don’t melt on a hot summer day don’t melt. What does this mean about the intermolecular forces in each material?

Would the spider be able to do this on oil? Why or why not? Here’s he structure of oil again as a reminder.

Resistance to external force.

Stronger IMF = greater surface

tension

http://ga.water.usgs.gov/edu/graphics/surfacetension-diagram.gif

Shout out to Katie Shi

Now be ready for a pop quiz!