Wednesday, January 7, 2009
Wednes-Day 2
AP Chem- tomorrow we have our exam on the vacation assignment material as well as on Hess Diagrams for the Born-Haber Cycle.
The exam covers the colligative properties of boiling point elevation, freezing point depression, and osmotic pressure; it also covers naming and formula writing of metal-ligand complexes (usually but not always involving transition metals) and, finally, the Hess Law problems and diagrams with which physicists and chemists calculate lattice energy, heat of formation, etc.
Today, we looked at the main cause of colligative properties, entropy, and its effect on lowering vapor pressure of a solvent as a solution forms by dissolving a solute in the solvent. As long as the dissolving solute is non-volatile (does not easily vaporize), then Raoult's Law is obeyed for solutions that behave "ideally" (more on that later this unit).
We saw that Raoult's Law is similar in form to Dalton's Law of Partial Pressures for gases.
We then reviewed a bit for tomorrow's exam. I have extra help in the AM for last minute questions. There are plenty of practice questions on Blackboard.
Bio 6- we reviewed the purposes of the major nutrients and then did a review worksheet on nutrition and the digestive system. We must start the endocrine system tomorrow.
Bio 7/8- we discussed disorders/diseases of the digestive system and went over the purposes of the major nutrients. We then did a review worksheet on nutrition and the digestive system. We must start the endocrine system tomorrow.
We did a lab using indicators to show the effect of salivary amylase on the starch contained in pretzels.
The exam covers the colligative properties of boiling point elevation, freezing point depression, and osmotic pressure; it also covers naming and formula writing of metal-ligand complexes (usually but not always involving transition metals) and, finally, the Hess Law problems and diagrams with which physicists and chemists calculate lattice energy, heat of formation, etc.
Today, we looked at the main cause of colligative properties, entropy, and its effect on lowering vapor pressure of a solvent as a solution forms by dissolving a solute in the solvent. As long as the dissolving solute is non-volatile (does not easily vaporize), then Raoult's Law is obeyed for solutions that behave "ideally" (more on that later this unit).
We saw that Raoult's Law is similar in form to Dalton's Law of Partial Pressures for gases.
We then reviewed a bit for tomorrow's exam. I have extra help in the AM for last minute questions. There are plenty of practice questions on Blackboard.
Bio 6- we reviewed the purposes of the major nutrients and then did a review worksheet on nutrition and the digestive system. We must start the endocrine system tomorrow.
Bio 7/8- we discussed disorders/diseases of the digestive system and went over the purposes of the major nutrients. We then did a review worksheet on nutrition and the digestive system. We must start the endocrine system tomorrow.
We did a lab using indicators to show the effect of salivary amylase on the starch contained in pretzels.
# posted by C @ 4:22 PM 
