cm6 - Chapter15 Water WaterMolecules O is more...

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Chapter 15 Water
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Water Molecules O is more electronegative than H Gives O a partial negative charge Bent shape makes molecule polar Strong hydrogen bonds Water molecules are attracted to one another better than other molecules its size
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Surface Tension liquid water acts like it has a skin. Water forms round drops. All because water hydrogen bonds.
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Surface Tension One water molecule H- bonds to another. Can H bond to molecules all around. H H O δ δ δ - H δ δ -
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Surface Tension A water molecule in the middle of solution is pulled in all directions.
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Surface Tension Not at the surface. Only pulled into water and close together Holds the molecules together. Causes surface tension.
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Surface Tension Water drops are round because all the molecules on the edge are pulled to the middle. Gravity can flatten them out on a surface
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Adhesive Force Glass has polar molecules. Attracts the water molecules. Some of the pull is up.
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Meniscus Water curves up along the side. This makes the meniscus.
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Meniscus In glass In nonpolar  Plastic
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Heat Capacity Water has a high heat capacity It takes more energy to get its molecules moving faster Water 4.18 J/gºC - Iron only 0.447 cal/gºC. Q = Mass x T x C Calculate the heat need to raise the temperature of 25g of iron and water by 75ºC
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Vapor Pressure The pressure caused by the vapor above a liquid at equilibrium Caused by molecules that escape Water has a low vapor pressure for a small molecule Hydrogen bonding keeps molecules from escaping.
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What happens to the vapor pressure of water as the temperature increase. A. It increase because more molecules have the energy to escape B. It decreases because the hydrogen bonds get stronger C. It increase because the hydrogen bond gets weaker D. It does not change because the strength of the hydrogen bond doesn’t change.
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Boiling point When vapor pressure equals external pressure.
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cm6 - Chapter15 Water WaterMolecules O is more...

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