Water Properties Lab. Water is Polar Covalent Hydrogen Bonds Weak bonds between like molecules.
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Transcript of Water Properties Lab. Water is Polar Covalent Hydrogen Bonds Weak bonds between like molecules.
![Page 1: Water Properties Lab. Water is Polar Covalent Hydrogen Bonds Weak bonds between like molecules.](https://reader035.fdocuments.in/reader035/viewer/2022062314/5697bf731a28abf838c7ee76/html5/thumbnails/1.jpg)
Water Properties Lab
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Water is Polar Covalent
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Hydrogen Bonds
• Weak bonds between like molecules
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Cohesion
• Attraction of water to water
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What forms a drop?
• Cohesion causes water to form drops
• surface tension causes them to be nearly spherical
• adhesion keeps the drops in place.
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Surface Tension
• Water attracts itself and pulls in to form a “film” on its surface to form a drop.
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Adhesion
• Attraction of water to an unlike substance• (like glass)• Note the drop is flatter than on wax paper
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Water Drop Shapes
• Water cohesion to itself and forms a nice, round drop.
• Round drop on wax paper (not strong adhesion to water).
• As adhesion to glass is stronger + pulls the water, it makes a flatter drop.
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On wax paper On glass
• More Cohesive More Adhesive
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Water on wax paper
• Plain wax paper Soapy wax paper
You can break surface tension with soap.
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Polar coheres to Polar not Nonpolar
• Water (Polar) has no adhesion to the wax (nonpolar) paper. It would roll right off.
• Water has more adhesion to a glass plate.
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Climbing Property of Water• Colors are
separated by densities. Less dense colors go to the top.
• Black is composed of all the colors.
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Capillarity – water climbs up small spaces
• The small spaces (pores of the paper) provide adhesion to the water.
• The water makes a column by cohesion to itself.
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Adhesion to paperCohesion of water to water
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Oil is hydrophobic
• Oil and water do not mix.
Oil is on top
Water is on bottom
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Food coloring dissolves in water.
• Water is polar.• Food coloring is polar.• Oil is nonpolar (no charge).• Oil has no hydrogen bonding.
• Polar molecules dissolve
polar molecules.
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Stirring oil and water
• The oil will go back to being separate from the water.
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Oil sheen on water (oil on top of water in a thin layer)
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Getting rid of oil on water• Detergent
breaks up the oil into very small droplets.
HowStuffWorks "How do you clean up an oil spill?“ (pick a video)
Booms
Burn Off
Hi-pressure water
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Slick Sack
• Absorbent
padHand washing
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Oil Spills Problems
• dead sea life
• human life
• cost of clean-
• up
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Amphipathic
• molecules have (hydrophobic) and to attract oil structure, but also have a region that is polar (hydrophilic) attracts water to wash it away.
Like detergent.