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Chapter 17 Section 1. Liquid Water and Its Properties: -it is foundation of all life -makes up 70% of body of humans -can exist in all three phases -Water is a triatomic molecule  made up of three atoms -Water is polar -bonding e- shared unequally

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Chapter 17 section 1
Chapter 17 Section 1

Liquid Water and Its Properties:

-it is foundation of all life

-makes up 70% of body of humans

-can exist in all three phases

-Water is a triatomic molecule made up of three atoms

-Water is polar

-bonding e- shared unequally

*caused by electronegativity diff.


-Many properties of water are due to hydrogen bonding

-water has strong intermolecular bonds between the hydrogen atoms and it is very

difficult to break these bonds


Properties Resulting From H-Bonding

  • high surface tension

  • low vapor pressure

  • high specific heat capacity

  • high heat of vaporization

  • high boiling point


Surface Properties

-surface of water acts as a skin

-page 476, fig. 17.4

-can overfill a glass

-both are explained by surface tension:

-inward force or pull that tends to minimize the surface area of a liquid

-holds water in shape of sphere

-can be reduced by adding a surfactant: interferes with hydrogen bonding

ex- soap


Low Vapor Pressure

vapor pressure- pressure right above the surface of a liquid, caused by molecules escaping to gas phase

-b/c of H-bonding the molecules cannot escape as easily so vapor pressure is low

-if not lakes, ponds, oceans would easily evaporate


High Specific Heat Capacity

specific heat- amount of heat needed to raise temp. of 1g of a substance 1°C

*due to H-bonding

-pool vs. car surface

-this property helps regulate temps


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