Aim: How do chemists use molecular geometry to predict polarity? Metallic bonding Polarity of water and "hydrogen bonding“ Water

Aim: How do chemists use molecular geometry to predict polarity? How to name covalent compounds? Use prefixes to note the number of each type of atom: mono-, di-, tri-, tetra-, penta-, hexa-, hepta-, octa-, nona-, deca-

Aim: How do chemists use molecular geometry to predict polarity? VSEPR (Valence Shell Electron Pair Repulsion) theory- a model that can be used to predict shape of a molecule based on repulsion of both bonding and nonbonding electron pairs. Challenge: Use VSEPR theory explain why carbon dioxide ( CO 2) has a linear shape while hydrogen sulfide (H 2 S) is bent.

Aim: How do chemists use molecular geometry to predict polarity? Describe the properties of ionic compounds, molecular substances, and metallic solids. Why do ionic compounds generally have higher melting and boiling points than molecular substances? Why are metals (with metallic bonds) good conductors of heat and electricity? Ionic compounds do not conduct electricity in the solid phase but do conduct electricity in the liquid phase or when dissolved. Explain.

Aim: How do chemists use molecular geometry to predict polarity? Do Now: Draw the Lewis structure for water and describe its shape. Why is water polar? Describe and draw/build four examples of polar molecules. Why is methane non-polar? Describe and draw/build three examples of non- polar molecules. Challenge: Use VSEPR theory explain why carbon dioxide ( CO 2) has a linear shape while hydrogen sulfide (H 2 S) is bent.