Monday, March 12, 2007
Mon-Day 4
Honors: we covered Boyle's and Charles's Law. We explained how and why each law results from the force and frequency of gas particle collisions. We looked at each law graphically. We will do the remaining separate gas laws tomorrow. Test on Thursday will cover stoichiometry, solution stoichiometry, measures of concentration (formulas must be memorized), solution dilution, colligative properties/calculations, solubility curves, soluble vs. insoluble salts (and hydroxide bases), all factors that affect net solubility and rates of dissolving.
Regents: we started the combined gas laws and explained two of the gas laws that are part of the combined gas law: Gay-Lussac's Law (constant V and moles of gas) and Charles's Law (net constant P and moles of gas). We drew the graphs that correspond to these laws, also. This unit is covered in Topic 7 in the orange review book and chapter 15 in the text.
AP: we went through a full titration of a weak acid by a strong hydroxide base and then of a weak base by a strong acid. We were most interested in the initial pH, the pH at halfway to the equivalence point (pH = pKa or, for a weak base titrated by a strong acid, pOH = pKb), the pH at the equivalence point, the pH just PAST the equivalence point, and, finally, the pH after much excess titrant has been added, i.e. the final (minimum or maximum, respectively) pH.
We looked at the titration curve that accompanies each of these titrations.
It is VERY important that you draw out, reason, and visualize what is occurring for each problem; students in the past confused different types of problems and did not write out the proper equation for what was occurring or they did not do the problem in a logical sequence, which led to incorrect reasoning.
Naturally, it takes a lot of practice and repetition to discern each type of question given that there are so many permutations of question types. I put up even more tutorials and solutions to assigned questions that should cover all of these permutations.
Wednesday's exam is one of the top three most important exams in the course, the exam after that is THE biggest and toughest exam in the course, and then, the electrochem exam will complete the trifecta of the most challenging tests that you will take this year.
Bring your "A" game to these tests!
Regents: we started the combined gas laws and explained two of the gas laws that are part of the combined gas law: Gay-Lussac's Law (constant V and moles of gas) and Charles's Law (net constant P and moles of gas). We drew the graphs that correspond to these laws, also. This unit is covered in Topic 7 in the orange review book and chapter 15 in the text.
AP: we went through a full titration of a weak acid by a strong hydroxide base and then of a weak base by a strong acid. We were most interested in the initial pH, the pH at halfway to the equivalence point (pH = pKa or, for a weak base titrated by a strong acid, pOH = pKb), the pH at the equivalence point, the pH just PAST the equivalence point, and, finally, the pH after much excess titrant has been added, i.e. the final (minimum or maximum, respectively) pH.
We looked at the titration curve that accompanies each of these titrations.
It is VERY important that you draw out, reason, and visualize what is occurring for each problem; students in the past confused different types of problems and did not write out the proper equation for what was occurring or they did not do the problem in a logical sequence, which led to incorrect reasoning.
Naturally, it takes a lot of practice and repetition to discern each type of question given that there are so many permutations of question types. I put up even more tutorials and solutions to assigned questions that should cover all of these permutations.
Wednesday's exam is one of the top three most important exams in the course, the exam after that is THE biggest and toughest exam in the course, and then, the electrochem exam will complete the trifecta of the most challenging tests that you will take this year.
Bring your "A" game to these tests!
# posted by C @ 12:42 PM 
