Exam 4 was returned today, average was ~110/150. Based on your 3 highest exam scores and Mastering Chemistry, I would estimate the current grade cutoffs at: 90.% = A, 80.% = B, 68% = C, 55% = D. Those cutoffs may shift around a little once the final exam scores are entered, but they shouldn't move significantly.
Don't forget, as stated in the syllabus, if you do not take the final exam, you fail the course regardless of previous performance.
As I mentioned in class, I have been tempted in the past to give a 1-question final exam. I do not actually do this because it would be exceptionally stressful for both you and me, but if I were to give a 1-question final exam, the question would probably look something like this:
325.0mL of 0.825M sodium carbonate solution reacts with 11.348L of hydrogen chloride gas at 1.082atm pressure and 17.28°C to produce carbon dioxide gas, liquid water, and sodium chloride. How many grams of carbon dioxide gas can be produced by this reaction? If all of the sodium chloride that can be produced by this reaction is dissolved in enough water to make 450.0mL of solution, what will be the concentration of sodium chloride in the solution?
If you have any other questions, stop by my office or email me. I will post answers to any emailed questions to the class blog. Good luck with your preparation and I'll see you on Thursday (or sooner...).
how do we do number 8 on exam 2a Fall 2008? it deals with a redox reaction.
ReplyDeleteIf something is oxidized, it loses electrons. (OIL = Oxidation Is Losing electrons; RIG = Reduction Is Gaining electrons) Chromium is going from +2 oxidation state to +3 oxidation state, so it must have lost an electron. CrSO_4_(aq) is being oxidized.
ReplyDeleteOn the other side, reduction is the process of gaining electrons, which causes the oxidation number to be reduced. (LEO = Losing Electrons is Oxidation; GER = Gaining Electrons is Reduction) Manganese is going from +3 to +2, so it must have gained an electron. Mn(NO_3_)_3_(aq) is being reduced.
I was wondering if you could please post the answer for the question you posted for the final...
ReplyDeleteThanks