WARM UP 1. Write the shape of: CO2 NH3

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Presentation transcript:

WARM UP 1. Write the shape of: CO2 NH3 2. Describe how you can determine whether a covalent bond is polar or non-polar.

The Big Bang Theory

Molecular Polarity

Polar vs. Non-polar Bonds Electronegativity difference Polar molecules .5 or greater Non-polar molecules less than .5

Polar vs. Non-polar Bonds More electronegative atom = slightly – Less = slightly +

Molecular Polarity Shape is a factor in polarity of whole molecule Polar molecules have two criteria to meet: Polar (dipole) bonds AND e- being pulled in one direction (dipole moment)

Molecular Polarity Non-polar molecules do not meet one polar criteria: Non-polar bonds OR Polar bonds pulling e- in equal and opposite directions

WRAP UP Are the following bonds polar or non-polar? CO2 CH4 H2O What are the geometric shapes of the molecules? Are these entire molecules polar or non-polar?

WARM UP Write a sentence or two describing all the factors that you need to consider when determining if an entire molecule is polar or not.

WRAP UP Are the following bonds polar or non-polar? NH3 CH2O BCl3 What are the geometric shapes of the molecules? Are these entire molecules polar or non-polar?

WARM UP Determine whether each of the following is polar or non-polar: NF3 CS2 H2O

WRAP UP Determine whether each of the following is polar or non-polar: PBr3 HCN CF4

WARM UP “One important key to success is self-confidence. An important key to self-confidence is preparation.” - Arthur Ashe Do you agree with this? Why? How does this apply to school?

WRAP UP