Sec. 4: Polar Bonds and Molecules Ch. 8: Covalent Bond Sec. 4: Polar Bonds and Molecules

Bond Polarity “Tug of War”

Bond Polarity Atoms compete for ___________ _________ in a molecule Nonpolar Molecules 1. Atoms pull ____________ 2. Share electrons ____________ 3. Ex: Cl2, O2 Polar Molecules 1. One atom ____________ more than the other 2. Electrons share _____________ 3. Also called “__________”

Bond Polarity

Attractions Between Molecules Dipole Interactions 1. __________ ___________ held together 2. Attraction between _______ _______ __________ 3. ________ than covalent or ionic bonds Hydrogen Bonds 1. Type of __________ __________ 2. __________ (+) attracted to atom in another molecule (-) 3. Hold together molecules of _________

Attraction Between Molecules

Attractions Between Molecules

Attraction Between Molecules Cohesion attraction of water molecules to ________ __________ ___________ Adhesion water molecules attract to_________ ____________ Surface tension cohesion at the ___________

Attraction Between Molecules Capillary Action 1. Adhesion and _________ 2. Water moves ________ 3. The narrower the tube, __________ the water.