For those of you that were in class today and those of you that were not, this post has something for all of you. First, a VodCast showing the solution to the problem given in class on Thursday, October 21st has a link and file on today's date on the AP Chemistry calendar. You are asked to view the solution to problem #2 from the 2007 AP Chemistry Test Form B. To offer up extra incentive to view the Vodcast, there will be a quiz given the last 20 minutes of class on Monday, October 25th over the material covered on the 1999 and 2007 test. The topics covered will be the Bohr model of the atom and calculations associated with the Bohr model. The topic of bond energy will also be incorperated. To give those of you a little prize for reading the blog, any student that writes "YABBA-DABBA-DOO" across the top of his or her quiz will get extra credit on the quiz.
Also on the calendar is a link and file for the Power Point for Chapter 6 if you would like to download it. I would suggest that everyone read sections 4 through 8 of Chapter 6. Hopefully everyone has some recall of electron configurations from the 1st year course.
Finally, I want everyone on Saturday to celebrate the greatest of little known holidays. On Saturday, October (10th month of the year) 23rd, from 6.02 a.m. to 6.02 p.m., please join me in celebrating MOLE DAY!! We will have a belated celebration on Monday. I will bring treats to class. Have a good weekend.
Friday, October 22, 2010
Tuesday, October 12, 2010
Gravimetric-Titration Lab
So you can solve for a percent error / difference on your lab, the concentration of barium hydroxide was 0.0723 M. Also, in case you forgot to write down the molarity of the sulfuric acid solution, the concentration was 0.119 M. Your lab reports will be due on Tuesday, October 19th, 2010. Remember, on Monday, October 18th, you will be having a quiz over the analysis and calculations associated with the lab.
Wednesday, October 6, 2010
Calorimetry Solution and Two More Problems
Below are the two problems (Calorimetry #1 and #2) that I would liked solved before class tomorrow, Thursday, October 7th, 2010. Below the two problems is the calorimetry problem presented in class and the solution to that problem.
Wednesday, September 29, 2010
Mole Ratio Lab Practice Quiz Key and Chapter 5
A .pdf file of the a key for the practice mole ratio lab quiz has been put on the AP Chemistry Events Calendar under today's date (9/29/2010). On tomorrow's date (9/30/2010), I have put the Power Point file for Chapter 5. You may want to print it off so you have notes to go from as I lecture in class. I will be utilizing it in class. We will be skipping much of Sections 5.1 through 5.3. Much of that material will be covered in Chapter 19 next spring.
You will be having your quiz over the Mole Ratio Lab analysis first thing tomorrow. Please see me if you have any questions about seperating the data or doing the analysis / intersection determination on your calculator.
Remember, on Friday morning, October 1st, there will be the remedial session to earn back 1/2 of your points from the Chapter 4 test. The remedial session will be in room #327 from 6:30 am to 7:15 am.
You will be having your quiz over the Mole Ratio Lab analysis first thing tomorrow. Please see me if you have any questions about seperating the data or doing the analysis / intersection determination on your calculator.
Remember, on Friday morning, October 1st, there will be the remedial session to earn back 1/2 of your points from the Chapter 4 test. The remedial session will be in room #327 from 6:30 am to 7:15 am.
Friday, September 24, 2010
Redox Lab Report and Chapter 4 Test Results / News
I will first address the results of the Chapter 4 Test. The average for the test was a 60%. The median for the test was also 60%. This is not out of the historical norm for this test. You may be asking yourself, "Why give the test if you have such poor averages?" I will reply that I want to give a very challenging test for all participants. I do not want a bunch of perfect scores. If I did have that, the test is not very challenging. On this exam, there was a high score of 17 out of 20 amongst the 29 students who took the exam. Now, to make things fair for all party's involved, I am going to curve this exam. In Infinite Campus, I am going to make this exam worth 40 points. (There were 20 questions, so I am going to double the points.) I am going to add 4 points to your total points earned out of 40. This is a 10% curve, which will bring the average up to 70%, which is a low "C", which is average. I know many of you would disagree with me and call a "C" failing, but that is in your own little world, not mine and the rest of human civilization. :)
But wait just one minute kids! I have an even better deal for you! If you choose, you can earn back one half (1/2) of your points. I am going to have another remedial session for those students who did not fair very well. If you attend the 45 minute remedial session next Friday morning (Oct. 1st) from 6:30 a.m. to 7:15 a.m., I will give you back 1/2 of your points that you missed. For many of you, this will exceed the 4 points that the curve offers. So, if you miss any more than 8 points, you will earn more than just taking the curve. For clarification, a 4 point curve will be given to everyone. Anyone wanting to attend the remedial session can earn more. I will not be including these test scores in the first six week grades because you can earn different point values if you choose.
Just to let you know, this will not be the last time a very low test average will be attained by the class. To make it challenging for all participants in the class, the tests need to be difficult. For context, I want to share with you a little story from my wife, the Lovely Mrs. Brueckner. When I told her of the complaining that many AP Chemistry students were taking part in after a particularly hard exam, she told me to tell them (the students) to "suck it up and live with it." The Lovely Mrs. Brueckner attended the University of California at Davis, which is a very renowned science school because of the Veterinary and Medical schools that are part of the university. Mrs. Brueckner was a cellular physiology major (Mrs. Brueckner is much smarter than Mr. Brueckner), which is major league science if you did not know. Anyway, Mrs. Brueckner shared that while at Cal Davis and taking organic chemistry, one test average in the class was in the mid-30% range. She attained a 65%. Her 65% became an "A". So the moral of the story is that it is not your actual score that is important, but rather, what was your score relative to everyone else. I had similiar experiences in college. You will be getting your exams back on Monday, September 27th.
On Monday, September 27th, your Oxidation / Reduction Titration Lab write-up will be due. There will be a different take on how I want the SEE's and Conclusion addressed in the lab report. Most people do fine in terms of attaining the 3% hydrogen peroxide value. Therefore, there is no reason to make-up SEE's, unless one trial really warrants having a SEE written about it due to a procedural gaffe during the lab. Otherwise, there was one systematic SEE that everyone has. It is #2 of the SEE's section. Make sure that you address how the addition of the inhibator in the hydrogen peroxide solution affects your calculated value for the percent hydrogen peroxide in the solution. Does it cause it to be higher than what it actually is? Does it cause it to be lower than what it actually is? Please give a well thought out reason why.
Your conclusion just needs to address all six questions listed in that section of the lab. Please write in complete sentences.
You will also getting back your quizzes based upon the Redox Titration lab on Monday. Also, on Monday we will be doing a pre-lab activity for a lab that will be completed on Tuesday, September 28th. Finally, another little remidner, the WebAssign work for Chapter 4 is also due Monday, September 27th, 2010. Have a good weekend.
But wait just one minute kids! I have an even better deal for you! If you choose, you can earn back one half (1/2) of your points. I am going to have another remedial session for those students who did not fair very well. If you attend the 45 minute remedial session next Friday morning (Oct. 1st) from 6:30 a.m. to 7:15 a.m., I will give you back 1/2 of your points that you missed. For many of you, this will exceed the 4 points that the curve offers. So, if you miss any more than 8 points, you will earn more than just taking the curve. For clarification, a 4 point curve will be given to everyone. Anyone wanting to attend the remedial session can earn more. I will not be including these test scores in the first six week grades because you can earn different point values if you choose.
Just to let you know, this will not be the last time a very low test average will be attained by the class. To make it challenging for all participants in the class, the tests need to be difficult. For context, I want to share with you a little story from my wife, the Lovely Mrs. Brueckner. When I told her of the complaining that many AP Chemistry students were taking part in after a particularly hard exam, she told me to tell them (the students) to "suck it up and live with it." The Lovely Mrs. Brueckner attended the University of California at Davis, which is a very renowned science school because of the Veterinary and Medical schools that are part of the university. Mrs. Brueckner was a cellular physiology major (Mrs. Brueckner is much smarter than Mr. Brueckner), which is major league science if you did not know. Anyway, Mrs. Brueckner shared that while at Cal Davis and taking organic chemistry, one test average in the class was in the mid-30% range. She attained a 65%. Her 65% became an "A". So the moral of the story is that it is not your actual score that is important, but rather, what was your score relative to everyone else. I had similiar experiences in college. You will be getting your exams back on Monday, September 27th.
On Monday, September 27th, your Oxidation / Reduction Titration Lab write-up will be due. There will be a different take on how I want the SEE's and Conclusion addressed in the lab report. Most people do fine in terms of attaining the 3% hydrogen peroxide value. Therefore, there is no reason to make-up SEE's, unless one trial really warrants having a SEE written about it due to a procedural gaffe during the lab. Otherwise, there was one systematic SEE that everyone has. It is #2 of the SEE's section. Make sure that you address how the addition of the inhibator in the hydrogen peroxide solution affects your calculated value for the percent hydrogen peroxide in the solution. Does it cause it to be higher than what it actually is? Does it cause it to be lower than what it actually is? Please give a well thought out reason why.
Your conclusion just needs to address all six questions listed in that section of the lab. Please write in complete sentences.
You will also getting back your quizzes based upon the Redox Titration lab on Monday. Also, on Monday we will be doing a pre-lab activity for a lab that will be completed on Tuesday, September 28th. Finally, another little remidner, the WebAssign work for Chapter 4 is also due Monday, September 27th, 2010. Have a good weekend.
Tuesday, September 21, 2010
New VodCast - Balancing Redox Reactions
I added a new VodCast. It is a .mov file, so it can be played with Quicktime. It can be found on the AP Chemistry calendar on the class web-site under the date of September 21st, 2010. It is problem 14(d) from WebAssign and deals with balancing the reaction in a basic environment.
Remember, we are meeting tomorrow (Wednesday, September 22nd) in the big computer lab in the library. We will be reviewing for the Chapter 4 test (which you will take on Friday, September 24th) and the Redox Titration Lab quiz (which you will take on Thursday, September 23rd.). You will have the opportunity to work on WebAssign during the period.
Monday, September 20, 2010
Redox Titration Lab: Balanced Equations_Concentration Calculations
Below are the images from the Power Point presentation shown in class today. Please use this as a guide on how to do all calculations for the lab. You will be required to do calculations like this on a quiz that will be given Thursday, September 23rd, 2010. Also, I will try and do a VodCast of the problem 14 (d) from WebAssign. I will post it under today's date (9/20) as a .mov file so can be played on Quicktime.
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