1. Take out your
Homework NOW

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

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

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

6. 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….

7. Covalent Bonds
Vs “Hydrogen Bonds”?

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

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

10. “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?

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

12. Homework
For Thursday!!! Written answer to Obj 16