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Why Basilisk lizards can walk/run on water
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Basilisks walking on water
Phenomena due to hydrogen bonding
Nancy Tran
SCH3U1-14
Basilisk lizards, also known as "Jesus Lizards" have the unique ability to walk or skitter across the surface of water.
WHAT?
HYDROGEN BOND
- Basilisk reptiles are able to walk on water because they take that advantage from a special property of water
- But before that, we should understand what intermolecular forces allow this to happen in the first place
HYDROGEN BOND
- are strong dipole-dipole intermolecular forces present between two molecules
- molecules - hydrogen atom covalently bonded with N, O, or F
Water molecules are made of 2 hydrogen atoms bonded to an oxygen atom
- occur between a small hydrogen atom of a molecule w/ a positive pole and a highly electronegative N,O, or F atom from another molecule
What property allows Basilisk Lizards to walk on water?
RELATION?
How it relates to hydrogen bonding?
- Water carries a special property of high surface tenion with the help of hydrogen bonging
- due to the "tug of war" with adjacent molecules feeling a pull from left & right and up & down, water molecules at the surface (exposure to air) pulls between neighbour molcules stronger.
Foundation
AT THE SURFACE
- the tug of war happening between the molecules deeper in the liquid
- At the surface, water is exposed directly to air and will have fewer neighbours to bond with above, increasing stronger bonds with the molecules close to them
- this is why water drops form a dome shape
Foundation
- the high surface tension of water, allow animals that dont weigh much to be able to stay on top
- Basilisk liazrds have flat wide feet and their weight is applied on a large surface area avoiding their force of the foot to seperate molecules and sink
- as a result, tiny air bubles form to help keep them on top as along as they continue their quick pace
VIDEO
DEMO
Since hydrogen bonds help with water's high surface tension this can be shown through a paperclip floating on water.
- paper clips weigh more than water but if the paper clip is carefully placed on the water, it will evuntaully float
(n.d.). Retrieved from http://scienceline.ucsb.edu/getkey.php?key=5082
Brainard, J. (2018, August 15). Hydrogen Bond. Retrieved from https://www.ck12.org/chemistry/hydrogen-bond/rwa/Walk-on-Water/
Exploring Our Fluid Earth. (n.d.). Retrieved from https://manoa.hawaii.edu/exploringourfluidearth/chemical/properties-water/hydrogen-bonds-make-water-sticky
How Lizards Walk on Water. (2017, December 15). Retrieved from https://www.chemistryforlives.com/hydrogen-bonding-1/
Hydrogen bonds in water. (n.d.). Retrieved from https://www.khanacademy.org/science/biology/water-acids-and-bases/hydrogen-bonding-in-water/a/hydrogen-bonding-in-water
Scientific. (n.d.). Retrieved from https://www.malcolmillustration.com/scientific-illustration/ku2m6ep1i2czl8pthaazndln9yfk9t