Aim How do chemists use molecular geometry to

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 nonpolar molecules. • Challenge: Use VSEPR theory explain why carbon dioxide (CO 2) has a linear shape while hydrogen sulfide (H 2 S) is bent.