Monday, March 05, 2007
Monday, Day 7
Honors: today, we returned to the Math of Chem Unit. We covered solution dilution and concentrations of individual anions and cations before and after dilution. We moved on to percent by mass and percent by volume concentration calculations as well as parts per million concentration calculations. Then, we began colligative properties and molality. More problems involving them tomorrow. I am letting you know straight up that there are no tests this week but keep up with the homework and practice please.
Regents: we covered ppm, percent by mass, and percent by volume calculations. We then covered colligative properties as affected by concentrations of dissolved particles. We learned that ionic compounds, because they dissociate into more than one mole of particles per mole of compound, have a greater affect on freezing point depression and boiling point elevation than the same concentration of a covalent molecular compound (unless the molecule is an acid).
Make sure that you can do quickly and easily do the Orange Review Book Section 7 questions that we have covered, the homework, and the practice worksheets and tests by Thursday. If you can do so, you will ace the next test.
AP: we learned that high charge density metallic ions form acidic solutions by causing high O-H bond polarity among their H2O ligands, which causes and H+ to break off and form H3O+ in solution, thus increasing the acidity of the solution.
We then went on to discuss Lewis Acid-Base Theory and we applied it to several examples; we also did equation writing for metal oxides and nonmetal oxides in water and learned that these are Lewis acid base reactions.
We then did a salt pH problem. Tomorrow, we will begin the king of all topics in chemistry: buffer solutions.
Regents: we covered ppm, percent by mass, and percent by volume calculations. We then covered colligative properties as affected by concentrations of dissolved particles. We learned that ionic compounds, because they dissociate into more than one mole of particles per mole of compound, have a greater affect on freezing point depression and boiling point elevation than the same concentration of a covalent molecular compound (unless the molecule is an acid).
Make sure that you can do quickly and easily do the Orange Review Book Section 7 questions that we have covered, the homework, and the practice worksheets and tests by Thursday. If you can do so, you will ace the next test.
AP: we learned that high charge density metallic ions form acidic solutions by causing high O-H bond polarity among their H2O ligands, which causes and H+ to break off and form H3O+ in solution, thus increasing the acidity of the solution.
We then went on to discuss Lewis Acid-Base Theory and we applied it to several examples; we also did equation writing for metal oxides and nonmetal oxides in water and learned that these are Lewis acid base reactions.
We then did a salt pH problem. Tomorrow, we will begin the king of all topics in chemistry: buffer solutions.
# posted by C @ 5:23 PM 
