Intermolecular Forces and Phase Change. by Kim Law and Alex Shames ! (and Mr. Bennett). How do geckos stick to things? Which intermolecular force is this?.
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?
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
Shout out to Katie Shi
Now be ready for a pop quiz!