Polarity and Electronegativity

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Presentation transcript:

Polarity and Electronegativity Tug of War Polarity and Electronegativity

What does the word POLAR mean to you? Think about it What does the word POLAR mean to you?

Polar Bear North/South Poles

Polar Molecules

What is Electronegativity? How much an atom in a molecule attracts electrons

Electronegativity Increases Electronegativity Decreases

Polarity Ionic bond: A bond in which the bonding electrons in the molecular orbital are transferred.

Polarity Covalent bond: A bond in which the bonding electrons in the molecular orbital are shared.

Polarity Nonpolar covalent bond: A covalent bond in which the bonding electrons in the molecular orbital are SHARED EQUALLY

Polarity Polar covalent bond: A covalent bond in which the bonding electrons in the molecular orbital are NOT SHARED EQUALLY

Electronegativity If the difference is… less than 0.4, = nonpolar covalent. between 0.4 and 1.7 = polar covalent greater than 1.7 = ionic

Tug of War F Na H P O As Cl Atom 1 EN value # people Atom 2 Hypothesis Observation F Na H P O As Cl

Atom 1 Atom 2 Electronegativity Difference Polar Nonpolar Ionic? C 2.6 O 3.4 3.4 – 2.6 = .8 Polar Covalent

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What are the separation techniques that you know about? February 15, 2008 What are the separation techniques that you know about?

February 19, 2008 Which of the following sets will dissolve in each other? Polar / Ionic Non Polar / Ionic Polar / Non Polar Non Polar / Non Polar Homework: Read Electronegativity Pgs 168-169 Take NOTES on what you read.

Which of the following sets will dissolve in each other? February 19, 2008 Which of the following sets will dissolve in each other? Polar / Ionic Non Polar / Ionic Polar / Non Polar Non Polar / Non Polar