Intermolecular Forces Topic 1: Hydrogen Bonding

Hydrogen Bonding  Draw the Lewis Dot Diagram of Water  Is it symmetrical horizontally and vertically?____________  Is it polar or non-polar?________________

Hydrogen Bonding  Demo of water and a charged ruler  What happened when the charged ruler was placed near the water?____________________________ __________________________________ __________________________________  Why did this occur?____________________________ __________________________________ __________________________________

Intermolecular Forces  Attractive forces between molecules Different from intramolecular bonds, which are between atoms Different from intramolecular bonds, which are between atoms Intramolecular Bond - between atoms Intermolecular Bond – between molecules

Hydrogen Bonding  Hydrogen bonds form between molecules when hydrogen is covalently bonded to small, highly electronegative atoms such as: Oxygen Oxygen Example: H 2 OExample: H 2 O Fluorine Fluorine Example: HFExample: HF Nitrogen Nitrogen Example: NH 3Example: NH 3 How can we remember these? You do a lot of bonding talking with your friends on the FON.

Hydrogen Bonding  Hydrogen bonds are strong intermolecular bonds  Example: Hydrogen Bonding in Water Hydrogen bond

Hydrogen Bonding  Movie: gy1111/animations/hydrogenbonds.html gy1111/animations/hydrogenbonds.html