8.5 ELECTRONEGATIVITY AND POLARITY. SUBTOPICS 1. Electronegativity 2. Bond types based on the difference in electronegativity 3. Polarity – in particular.

8.5 ELECTRONEGATIVITY

AND POLARITY

Metals have aLOW HIGHelectronegativity.

Nonmetals have aLOW HIGHelectronegativity.

The character and type of bond can be predicted using the

________________________________ between the two elements that are bonded together.

A chemical bond is always completely ionic or covalent

TRUE OR FALSE??

chargeson atoms Na F

E.N. = 0.9 4.0

difference in E.N. = _______

chargeson atoms

C ------ F

E.N. = 2.5 4.0

difference in E.N. = ______

ElectronegativityDifference

Type of Bond

Textbook’s version :4 choices

Version we’ll use:3 choices

BOND DIFFERENCE INELECTRO-NEGATIVITY

BOND TYPE

C - C

C - H

ALCOHOLS SOLUBILITY IN H2 O(mol/100 g H2 O)

CH3OH (methanol) ∞

CH3CH2OH (ethanol) ∞

CH3CH2CH2OH (propanol) ∞

CH3CH2CH2CH2OH (butanol)0.11

CH3CH2CH2CH2CH2OH (pentanol)0.030

CH3CH2CH2CH2CH2CH2OH (hexanol)0.0058

In a chemical change, which type of molecular bonding is broken?

Also, what can you deduce about the properties of the Wicked Witch, based on this incident?