11. 1. 2010

• At the beginning of class, Mr. Paek collected any quizzed people needed to take home on Friday and the extra credit unit 4 packets. He also check in the homework that was assigned over the weekend which was pages 9-13 in the journal.
• We went over the homework (pages 9-13) and if people had any questions on the homework they were answered.
• Mr. Paek taught the class a short cut on writing the formulas for compounds. For example if the compound is cobalt (III) carbonate, since cobalt has a charge of +3 and carbonate has a charge of -2, in order to write the formula you can just switch the charge numbers, ex. Co2Ca3
• For the majority of class we worked on our journal pages alone and asked questions as needed.
• At the end of class we took a short quiz testing out ability to write compound formulas and name compounds etc.

Don't forget to read pages 253-258 in the book and answer question number 7 on page 258.

Also we have 2 web assigns.

10.29.10

At the beginning of first period, Mr. Paek tough us a little on ionic formulas and how to figure out the formulas for different compounds. For example, if we had a K+ and a O2- then we would need to get potassium's charge the opposite of oxygen and to equal zero. Here are some other Examples of ionic formulas:

Ex:
Co3+ and Cl- = CoCl3-
K and N= K3N



Mr. Paek also talked about Polyatomic Ions and their symbols. Polyatomic ions are ions that such as Sulfate, Nitrate, Phosphate, Etc... Mr. Paek also went over how to name the formulas Such as CaCl2 would be calcium chloride. He also noted that if there was a roman numeral in front of the first named element that it was the charge. After we walked everything trough we took a quiz on a few things we've already talked about its nothing to worry about. after the quiz Mr Paek assigned some homework.

Homework:
Worksheets handed at beginning of class. pages 11, 12, 13, and 14.