29 - So there is a weak attraction between atoms The...

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Secondary bonding: weak compared to primary bonding by a factor of about 10 The two main types of secondary bonds are hydrogen and van der waals Primary include metallic (metals), ionic (ceramics), covalent (polymers) Hydrogen bonds- hydrogen is bonded to weakly to oxygen, flouorine, or nitrogen. In Hydrogen bonding, hydrogen acts like it is weakly positively charged and the other atoms participating in the hydrogen bond is slightly negatively charged. Van der Waals bonds caused by vibration of atoms leading to an induced dipole. A neatural atoms plus virbration turns into a slight segretation of charge (dipole).
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Unformatted text preview: So there is a weak attraction between atoms. The molecules of water H20 is held together by covalent bonds but each water molecule is hydrogen bonded to its neighboring molecule.-ice floats in water water expands when it forms ice, ice is less dense than surrounding water Te water molecules in ice form a relatively open (lower density) structure in order to have the most amount of hydrogen bonds. The volume increase is about 9%-icebergs float-ice forms pothole-need anti freeze in car-main chemical properties of ceramics is that they tend to be brittle and break...
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This document was uploaded on 10/17/2011.

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