PChem312 s22 w2 - Revision history

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Class Assignment

@@ Line 100: / Line 100: @@
 ::- Did you "Write out in your notes the work that shows nR = Nk"
 ::- Did you complete the Excel file using the van der Waals equation of state?
-I will print (no you) this [[PChem_Check_List_01|PChem Check List (first 2 weeks)] and check your work on Monday.
+I will print (no you) this [[PChem_Check_List_01|PChem Check List (first 2 weeks)]] and check your work on Monday.

@@ Line 87: / Line 87: @@
 ====Class Assignments====
-:1) You only assignment today is to verify all previous assignments. As i noted through out the wiki pages, i will check to make sure you did all the items i requested in the past 2 weeks. Each will count as a homework/lab assignment:
+:1) You only assignment today is to verify all previous assignments. As i noted through out the wiki pages, i will check on MONDAY to make sure you did all the items i requested in the past 2 weeks. Each will count as a homework/lab assignment:
 ::- Lab 1 carbon copies with notes on NOVA program, with answers to all 12 questions posted on wiki (week 1).
 ::- Do your notes contain the units listed in Table ME-1.2?
@@ Line 100: / Line 100: @@
 ::- Did you "Write out in your notes the work that shows nR = Nk"
 ::- Did you complete the Excel file using the van der Waals equation of state?

@@ Line 92: / Line 92: @@
 ::- Do your notes contain the example worked out in section ME1.3?
 ::- From last Friday...did you write out in your notes the 3 "heat" calculations (answers &rarr; 4810 J, you tell me, and ...)?
-:::'''Note: although i could give you the answers to these problems and you could then check them against an "answer key", but this is a very "immature" way of teaching/learning. You should be confident in your answers based on your process of answering the problem; if you did not understand the problem, then you should go back to review the material or seek help.'''
+:::'''Note: although i could give you the answers to these problems, you should be confident in your answers based on your process of answering the problem; if you did not understand the problem, then you should go back to review the material or seek help.'''
 ::- From last Friday...did you write out in your notes the 4 "heat"/&Delta;H calculations (ansers &rarr; 6.02 kJ, ..., 109 kJ, ...)?
 ::- Do you have a graph drawn in your notes showing how you think that pressure inside of a balloon increases as a gas is added?

← Older revision		Revision as of 13:43, 21 January 2022
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	===Fri, Jan 20, 2022===		===Fri, Jan 20, 2022===
		+	====Announcements====
		+	:1) We are done with Chapter 1...fyi, this is a very slow start to the semester. Chapter 2 has some very important topics that set the foundation for thermodynamics, so i am not going to start this today, but instead in-person on Monday...9 am CSB 378. Let me remind you that attendance in PChem is essential.
		+
		+	====Class Assignments====
		+	:1) You only assignment today is to verify all previous assignments. As i noted through out the wiki pages, i will check to make sure you did all the items i requested in the past 2 weeks. Each will count as a homework/lab assignment:
		+	::- Lab 1 carbon copies with notes on NOVA program, with answers to all 12 questions posted on wiki (week 1).
		+	::- Do your notes contain the units listed in Table ME-1.2?
		+	::- Do your notes contain the example worked out in section ME1.3?
		+	::- From last Friday...did you write out in your notes the 3 "heat" calculations (answers → 4810 J, you tell me, and ...)?
		+	:::'''Note: although i could give you the answers to these problems and you could then check them against an "answer key", but this is a very "immature" way of teaching/learning. You should be confident in your answers based on your process of answering the problem; if you did not understand the problem, then you should go back to review the material or seek help.'''
		+	::- From last Friday...did you write out in your notes the 4 "heat"/ΔH calculations (ansers → 6.02 kJ, ..., 109 kJ, ...)?
		+	::- Do you have a graph drawn in your notes showing how you think that pressure inside of a balloon increases as a gas is added?
		+	::- Do you have answers (2) in your notes regarding the weather balloon video?
		+	::- Do you have the Gen Chem Lab calculations 3-6 in your notes?
		+	::- Did you submit the Heating-Cooling Curve for Water...last Tues? (''Don't worry i can check this myself'')
		+	::- Did you "Write out in your notes the work that shows nR = Nk"
		+	::- Did you complete the Excel file using the van der Waals equation of state?

@@ Line 12: / Line 12: @@
 ::Thermal imaging (IR) can be used to evaluate heat loss...we have one of these cameras.
-::- Balloons are interesting. The most important feature of a balloon is that the volume can change (boundary is not fixed). When you add more stuff, the pressure inside the balloon does not change (???), but it responds by increasing volume. Under most cases, a balloon is considered a closed system, but in reality, helium can diffuse through the walls of a latex balloon and hence are not truly closed. This is way we have Mylar balloons that can hold helium for months. It would be weird if a balloon attempted to be adiabatic...not even sure how this would be designed since the stretchiness of the walls is required to expand, resulting is thinner walls...balloons are by design diathermic.
+::- Balloons are interesting. The most important feature of a balloon is that the volume can change (boundary is not fixed). [''Edited sentence follows, 1/21/2022, bes''] When you add more stuff, the pressure inside the balloon does change, but it mainly responds by increasing volume. Under most cases, a balloon is considered a closed system, but in reality, helium can diffuse through the walls of a latex balloon and hence are not truly closed. This is why we have Mylar balloons that can hold helium for months. It would be weird if a balloon attempted to be adiabatic...not even sure how this would be designed since the stretchiness of the walls is required to expand, resulting is thinner walls...balloons are by design diathermic.
-::As noted above, when you add air/gas to a balloon, the volume changes, but in reality the pressure changes as well. In your notes, please draw a graph of pressure (y-axis) and volume of air (x-axis) and ass-u-me the balloon will burst at 30 psi, when 5 liters of air has been added.
+::As noted above, when you add air/gas to a balloon, the volume changes, and the pressure changes as well. In your notes, please draw a graph of pressure (y-axis) and volume of air (x-axis) and ass-u-me the balloon will burst at 30 psi, when 5 liters of air has been added.
 ::Continuing with the balloon...watch this weather balloon [https://youtu.be/jXP-va2t4D8 video] then answer the questions below in your notes:

@@ Line 79: / Line 79: @@
 ::::[[File:van der Waals eq.PNG|400px]]
 :- Please use Excel to reproduce [[:File:van der waals example EXCEL.PNG|this figure]]; the van der Waals coefficients can be found [[:File:van der Waals table.PNG|here]]. PLEASE use global variables/universal constants/constant values so that once the Excel file is completed, you can change these parameters and the rest of the spreadsheet will update. If you don't know what a global variable is...ie. B3 vs. $B$3...please see https://youtu.be/6y_Nf6uvPxw
 ===Fri, Jan 20, 2022===

@@ Line 78: / Line 78: @@
 :A guy named, van der Waals put together an equation which took into a account that there ARE interactions between gas atoms/molecules (d above are not totally true). Eq. 1.22 (p 15) is the van der Waals equation...of state for non-ideal/real gases.
 ::::[[File:van der Waals eq.PNG|400px]]
-:- Please use Excel to reproduce [[:File:van der waals example EXCEL.PNG|this figure]]; the van der Waals coefficients can be found [[File:van der Waals table.PNG|200 px|here]]. PLEASE use global variables so that once hte Excel file is completed, you can change the temperatures and the rest of the spreadsheet will update. If you don't know what a global variable is...ie. B3 vs. $B$3...please stop by...it is not easily answered via email.
+:- Please use Excel to reproduce [[:File:van der waals example EXCEL.PNG|this figure]]; the van der Waals coefficients can be found [[:File:van der Waals table.PNG|here]]. PLEASE use global variables so that once hte Excel file is completed, you can change the temperatures and the rest of the spreadsheet will update. If you don't know what a global variable is...ie. B3 vs. $B$3...please stop by...it is not easily answered via email.
 ===Fri, Jan 20, 2022===