29 August 2012 LHP 20: Water AcrosticRHP 21: Water Molecule.
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Transcript of 29 August 2012 LHP 20: Water AcrosticRHP 21: Water Molecule.
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29 August 2012
LHP 20: Water Acrostic RHP 21: Water Molecule
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Water
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The Water Molecule
• H2O
• Water is a polar molecule– It has a positive and a
negative end.– Overall neutral charge
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Polar Molecules
• Electrons are pulled closer to larger nucleus.
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Hydrogen Bonds
• Attraction of partial opposite charges between hydrogen and oxygen [for example]
• Polar molecules attract to other polar molecules .
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Water’s polarity allows it to dissolve sodium chloride [NaCl] and many other ionic and polar compounds.
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Cohesion
• Attraction between molecules of the same substance.– Ex. Water beading up on smooth surface.– Try floating a metal pin on water.
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Adhesion
• Attraction between molecules of different substances.– Capillary action
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Water
• Water expands when it freezes. So ice is less dense than liquid water and it floats.
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IAN LHP
• Draw a water molecule – Illustrate its polarity
• Water Acrostic– 5 sentences about water’s properties.
WATER
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Water is essential to all life. Clean drinking water is vital to human health.
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In many developing countries women and children spend many hours simply collecting water.
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What would you do?
• How would you go about solving this problem?