There were some great questions asked in class today about Kinetics. As for # 82, the answer is indeed what I gave in class: Rate = k[N2H2O2]/[H+]. The question was asked, why is [H+] in the rate law when it is an intermediate? When reading more about it, the book and online state that you cancel out intermediates that occur before the slow step. So since the H+ only shows up again after the slow step it is ok to have in the rate law. Check out the bozeman videos on the AP page that talk about multi-step reactions and reaction intermediates to help if you are still struggling. Come with any additional questions about kinetics and be ready to move into Thermodynamics tomorrow.
Make sure that you are checking the bottom of the AP Chem blog on this page. There have been some great questions asked that might be helpful to you if you are struggling with the lab or homework. Just an update, Porter Alvin Thompson was born on Fri, Jan 2, 2015. We are home and everyone is doing well. I will be continuing to check the webpage here for questions so please keep them coming when you have them. Since the baby came so late into break, I will definitely not be in at all this first week, but am hoping to get the ok from the doctor to come in for just a short while to meet with the sub and collect papers to grade occasionally I hope that all of you have enjoyed your break and that you are ready to pick up where we left off and keep moving when you return. Here is the information as promised.
1984 #72 The correct answer is C as Morgan and I were discussing in class. The reason that C is correct is because the vapor pressure of water is a standard that you look up in a chart. The barometric pressure does have to be measured and is not the correct answer. 1994 #40 The following website will be helpful in giving you visuals of what I am attempting to explain here. www.kentchemistry.com/links/GasLaws/manBar.htm Since it is in a closed system, the vapor pressure from the gas is equal to h. However, there is water and oxygen in the container. Since 28 mmHg are due to the water vapor Pt-PH2O = PO2 which means the answer is 133 mmHg. Again, don't expect a question like this to be on tomorrow's test. I will look later as to whether I am remembering correctly about this not being a part of the AP Test anymore because I am pretty sure this was taken off. Use this site to post questions that you may have. All others in the class can see what is being asked and gain better understanding through this blog site as well. Also, when I see what the struggles are that you guys are facing, I can better address them during class time.
|
Archives
March 2015
Categories |