Midterm 1.
See EXAMS page for more information.
12. Monday, October 5, 2009
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Category Archives: Chapter 1, 2, IC
7. Wednesday, September 23, 2009
Mole/mass conversions, Percent composition
1. Read chapter 2 (82-94)
2 . 2.7, 2.9, 2.10, 3.1, 3.2 OWLs due Thursday, September 24
Sept 23 Lecture
NOTE: Table of ions that you need to know is on page 74, Table 2.4. I showed the table from the older edition of the textbook during lecture
Some interesting comments near the end of lecture regarding the distinction between a physical change and a chemical change. Although it is correct that moderate inputs of energy often lead to physical changes, the most important criterion is that of bonding. If the bonding between atoms changes, then it is a chemical change – so heating Co(H2O)6Cl2 to produce CoCl2 absolutely changes the bonding within this chemical compound.
Chemical Families and Formula
Prof. Botch posted a nice summary of how to predict the charge of mono-atomic ions, and the composition of many covalent compounds. This can be a big help in making the transition from memorizing alot of compounds (as the book asks), to identifying some the trends that will help you predict formulas.
6. Monday, September 21, 2009
Chapter 2 Book HW
Chapter 2,
#120,123,130,137,146,149
Not collected, but these are great problems to challenge yourself. Really good subjects for study groups. Answers are written in the form of a comment (below) – no peeking!
Fully worked-out answers can be obtained upon email request to any of the study group coordinators, or me, or Nag. But we’ll only send you one answer. To get more than one answer, you’ll need to find other students (hopefully with different answers!) or a study group.