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Presentation transcript:

Take out your Homework NOW

Homework Why are water molecules partially charged? Why do belly flops hurt? Written answer to Obj 4 and 5

Electronegativity An element’s affinity for electrons… in a bond Covalent bond – sharing a pair of electrons Not everyone “shares” equally

On your periodic table, color… Elements with e-neg > 2.8 “A” Elements with e-neg 2.8-2.6 “B” Elements with e-neg 2.5-2.0 “C” Elements with e-neg < 2.0 “D” This is a 15-MINUTE EXERCISE!!!!

Electronegativity Unequal sharing in a covalent bond Electronegativities of H and O? Where are the electrons? What does that do to O and H in the molecule? Draw it out Then draw another….

Covalent Bonds Vs “Hydrogen Bonds”?

Electronegativity Why are water molecules partially charged? Why do belly flops hurt?

Electronegativity When a molecule has opposite charges on ‘ends/sides’… = Polar O=C=O polar or non-polar?

“Patterns” in Charges Oxygen and Nitrogen have “high” electronegativities Carbon and Hydrogen are relatively “low” Whenever you see an O-H or an O-C bond you should think? How about N-H? N-C? What about C-H?

For the circled atoms, indicate if they would be partial + or - , or neutral in the molecule.

Homework For Thursday!!! Written answer to Obj 16