1. A Review of General Chemistry

Predict the approximate bond angles:

c. the C—N—H bond angle in (CH₃)₂NH

d. the C—N—C bond angle in (CH₃)₂NH

Use your molecular models to make ethane, and compare the model with the preceding structures.

For each of the following compounds and ions,

1. Draw a Lewis structure.

2. Show the kinds of orbitals that overlap to form each bond.

3. Give approximate bond angles around each atom except hydrogen.

a. [NH₂]^–

For each of the given species:

a. Draw its Lewis structure.

b. Describe the orbitals used by each carbon atom in bonding and indicate the approximate bond angles.

3. CCl₄

Predict the hybridization of the oxygen atom in water, H₂O. Draw a picture of its three-dimensional structure, and explain why its bond angle is 104.5°.