Ionic and Covalent Bonds

Advanced Chemistry
Today we practiced writing ionic compounds. When a positive ion and a negative ion are put together, the total charge of the compound should be zero. Some examples of binary ionic compounds are barium nitride (Ba₃N₂), aluminum chloride (AlCl₃) or sodium sulfide (Na₂S). Please memorize the eight polyatomic ions that I taught you in the song. Your homework is to work on the packet that we started today in class. Try to finish as much as you can with the names and formulas.

Honors Chemistry
Today we did more work with the concept of empirical and molecular formulas. We also reviewed the rules for naming covalent compounds. You should be able to write the formula from the name and vice versa. We reviewed the procedure for drawing Lewis dot structures as well as how to identify the molecular geometry. In our lab experiment today, we measured the mass of a copper sulfate hydrate salt and then heated it in a crucible to drive off all the water. You should be able to calculate the mass of water lost. You should convert the mass of water into moles. Then convert the mass of the anhydrous CuSO₄ into moles. If you calculate the mole ratio of H₂O to CuSO₄, you should get a number that is approximately 5.