CHEMISTRY COMMUNITY

Elle_Mendelson_2K

We will be told I believe

Elle_Mendelson_2K

Yes because you’re reactants are decreasing and slope is negative

Elle_Mendelson_2K

how do u find delta n as in moles not electrons

Elle_Mendelson_2K

I think this may be due to you using log instead of ln? On the equations sheet for the nearest equation they use ln. Which should we use?

Elle_Mendelson_2K

Hello! When I plug in the same formulas and do all the same steps, I get a couple numbers off. For example, for 1d I got -75740.725. Is this a rounding issue or is something off in my settings. I don't think I rounded anything until the end.
Further for 1c I got .169V instead of .157V

Elle_Mendelson_2K

Thank you!

Elle_Mendelson_2K

What do we need to know about concentrations cells? Will we asked to calculate anything? or just the concept?

Elle_Mendelson_2K

Where can we find week tens worksheet?

Elle_Mendelson_2K

Will we need to do calculations for collision theory? Is the equation is not on the constants and equations sheet?

Elle_Mendelson_2K

Will we have to graph anything by hand or will graphs be given to us?

Elle_Mendelson_2K

Does anyone know what the midterm average was?

Elle_Mendelson_2K

He has not yet posted it.

Elle_Mendelson_2K

Do we need to know the common ion effect for the final?

Elle_Mendelson_2K

Will we have to solve cubic equations on the final?

Elle_Mendelson_2K

when we multiply the conc by a factor lets say of two, do we square k? if we divide conc by 2 do we square root it?

Elle_Mendelson_2K

When can we assume the ideal gas law as an approximation? It is asked on Dr. Lavelle's first outline.

Elle_Mendelson_2K

Can someone explain why we switch AgBr -> Ag + Br- instead of Ag-> Ag+? I get that you could say that because the standard cell potential of the first is less positive, you would switch that one however the original reaction. Is that why?

Elle_Mendelson_2K

Hello, will someone explain how to figure out n? In the solutions manual it says that n is 6. The reaction is: 6Fe3+ + 2Cr3+ +7h2O---> 6 Fe2+ + Cr2O7 2- + 14H+

Elle_Mendelson_2K

Also, does the order of the elements matter? As long as they are on the correct side, is there a difference?

Elle_Mendelson_2K

Thank you so much! wouldn't it be 4P4? Or can you explain why there is only one P4? thank you!

Elle_Mendelson_2K

Hi again, can you explain both parts? I can't seem to get P4->Ph3 balanced!

Elle_Mendelson_2K

Will someone explain how to balance d in chapter 14 problem 5 in the 6th edition. I don't understand why the OH is on the right side instead of the left when you would add H2O on the left and therefore OH- on the right

Elle_Mendelson_2K

Thank you so much! Would you say that any other chem classes were as helpful for the MCAT or did the MCAT only cover 14a and b material?

Elle_Mendelson_2K

There were elements of Gibbs free energy in many different sections of the text book. Which chapter should we focus on? Also, should we read those sections?

Elle_Mendelson_2K

What should this weeks homework be on?

Elle_Mendelson_2K

Can some one explain chapter 8 #51

Elle_Mendelson_2K

Does anyone know the Title of Lyndon's Midterm Review Sheet?

Elle_Mendelson_2K

Delta H is the change in enthalpy. H = U + PV is one of the equations.

Elle_Mendelson_2K

Does that mean that in the 6 edition anything after section 11 will not be on the exam?

Elle_Mendelson_2K

While it is possible to have a negative pH or a pH that is above 14, for the purpose of this class, we are only considering phs of 0-14.
Hope this helps.

Elle_Mendelson_2K

How does expansion and compression effect the reaction?

Elle_Mendelson_2K

Around 12.55

Elle_Mendelson_2K

Will we need to convert from Kc to Kp for this test?

Elle_Mendelson_2K

I don't believe you switch the x values. Instead, if q>k then the reaction sits to the left. All that means is that the reaction favors the reactants. I believe you get a negative value only for the c potion of the ice table usually for the reactants because that is what you have first. Then in the ...

Elle_Mendelson_2K

Does anyone know if the UA sessions will still be available this Monday? (even though it is a long weekend?)

Elle_Mendelson_2K

Does anyone know the dates of when both of the tests will be administered? I found the midterm and the final dates but not the two chapter tests. Thank you!

Elle_Mendelson_2K

(P)ressure is in atm (atmospheric)
(N) is moles
(V) is liters
(T) is kelvins
(R) is a constant ".0821" liters x atm/moles x kelvin

Elle_Mendelson_2K

Personally, I find attending lectures and reading through the textbooks critical! I think that doing as many book work problems as you can is so important and will prepare you well for his tests. Additionally, attending the workshops helps a lot. Just for reference- last quarter the average grade wa...

Elle_Mendelson_2K

hello, why Is this hexadentate/ why don't the oxygens with a double bond bind to the tm?

Elle_Mendelson_2K

Will someone please explain 22

Elle_Mendelson_2K

Will someone please explain heme complexs. Thank you

Elle_Mendelson_2K

Will someone please explain number 20?

Elle_Mendelson_2K

Thank you Lyndon! Is this the same level of difficulty as the final will be?

Elle_Mendelson_2K

I believe Lavelle prefers the d to be at the end.

Elle_Mendelson_2K

Sigma bonds are about the internuclear axis and overlap on top of one another (like two pancakes) whereas pi bonds interlap side to side like (two vertical rods)

Elle_Mendelson_2K

another thing to note is that cis and trans usually are isomers meaning they have different properties. For example, one isomer can be polar while another can be non polar.

Elle_Mendelson_2K

A simpler way to look at it is that the N is surrounded by three of the same atom. Therefore, because they are the same atom with the same electronegativity the dipole moments will cancel. Something to note is that this molecule will cancel because this molecule is not one planar, each angle is 120 ...

Elle_Mendelson_2K

On the exam, will we need to write << or can we just write < ?

Elle_Mendelson_2K

It could be because the two lone pairs effect the molecule equally. Therefore, the molecule will stay linear.

Elle_Mendelson_2K

What is the difference between a radical and diamagnetic molecule?

Elle_Mendelson_2K

Hello,
Where can we find the worked out solutions to the midterm? Are they on the class website? I have searched Chem Community and haven't found anything but remember Professor Lavelle saying he will post the worked out solutions.

Thank you!

Elle_Mendelson_2K

Will someone explain # 3 b for 2F in the 7th edition?
I got part of the question right, my lewis structure showed that there are 2 pi bonds and 2 sigma bonds, but it says that there is also 1 pi bond and 2 sigma bonds.
Thank you!

Elle_Mendelson_2K

Will someone explain # 3 b for 2F in the 7th edition?
I got part of the question right, my lewis structure showed that there are 2 pi bonds and 2 sigma bonds, but it says that there is also 1 pi bond and 2 sigma bonds.
Thank you!

Elle_Mendelson_2K

Does anyone know if Lyndon or any of the other Uas/ TAs are having their review sessions on Tuesday?

Elle_Mendelson_2K

Hello,
Does anyone know if we are ahead in class and won't have lecture next Wednesday? I'm trying to make travel plans :).
Thanks!

Elle_Mendelson_2K

Hello!
I have the 7th edition of the textbook and was wondering what homework was acceptable for this week as in Lecture we are only up to 2E.
Thank you

Elle_Mendelson_2K

Hello!
I have the 7th edition of the textbook and was wondering what homework was acceptable for this week as in Lecture we are only up to 2E.
Thank you

Elle_Mendelson_2K

Will someone explain 10A?

Elle_Mendelson_2K

Does anyone know why the atomic radius of Al is greater than the atomic radius of silver?

Elle_Mendelson_2K

Hello, for number 6a I keep getting 9.36X10 ^-46 instead of 9.36*10^-11 will someone explain what I am doing wrong? I have looked at another students work and we did the exact same thing but I got a different answer. Please help!!
Thank you!

Elle_Mendelson_2K

Are there any past exams Lavelle has released? I received an email from a third party saying there was a study guide on their website. Does anyone think it will be helpful?

Elle_Mendelson_2K

Will someone explain 8b? I know that we need to use all of the information given in the question but I am not sure how wavelength corresponds to work functions. Thank you!

Elle_Mendelson_2K

Hello! Does anyone know where we can find the solutions sheet. Thank you!

Elle_Mendelson_2K

Does anyone know how many questions will be on the midterm?

Elle_Mendelson_2K

Hello! Does anyone know if chapter 1 E and 1 F will be on the midterm as they were not on test two. (I am using the 7Th edition textbook)

Elle_Mendelson_2K

How are Quantum Numbers involved? My TA was saying that you can tell properties through Quantum Numbers but I didn't quite understand it.

Elle_Mendelson_2K

Will we have to memorize it or will it be given on the front sheet of the exam?

Elle_Mendelson_2K

Hello! I was wondering if anyone could explain the concept behind nodal planes? I am having trouble conceptualizing it.
Thank you!

Elle_Mendelson_2K

Hello! I was wondering if anyone could explain the concept behind nodal planes? I am having trouble conceptualizing it.
Thank you!

Elle_Mendelson_2K

Does anyone know when grades will be posted to the website?

Elle_Mendelson_2K

Hello! Will someone explain G5, from the 7th edition textbook? I understand how to find the Molarity of the compound in the solution, I just don't understand why when finding how much volume of the solution to obtain 2.15 nmol of Na+ you multiply the 2.15X 10^3 mol of Na / 0.0796 by 1mol of Na2CO3/ ...

Elle_Mendelson_2K

Are these questions similar to those on the test this week? The worksheet obviously covers the topics on the exam but is the phrasing and level of difficulty similar?
Thank you!

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