CHEMISTRY COMMUNITY

Stevie Wisz

I got the same name you did but cyclopentane rather than cyclohexane.

Stevie Wisz

So, basically, the difference is that functional groups may contain atoms other than C and H like N or O while substituents are only hydrocarbons?

Stevie Wisz

But for our final exam, we should only focus on the conformations given to us as those of the specific molecules right? Like cyclohexane would be chair? Thanks!

Stevie Wisz

Only iso and neo are included in the alphabetizing so when you have tert and sec, you alphabetize in regards to the molecule. Tert-butyl would be before sec-pentyl. Hope this helps!

Stevie Wisz

Here is a super helpful link!!

https://www.angelo.edu/faculty/kboudrea/organic/IUPAC_Handout.pdf

Stevie Wisz

So, on the quiz would both answers be correct?

Stevie Wisz

Ronald's got it down! Catalysts appear on the reactant side as well as on the product side at some point in a reaction mechanism.

Stevie Wisz

This is so awesome! Thank you!

Stevie Wisz

I would first talk to you TA about it because they are the one who grades it! Also, the sooner the better!

Stevie Wisz

Thank you!!!

Stevie Wisz

Can someone explain to me the pre equilibrium approach. I am utterly confused and even after reading page 75 repeatedly, am still super confused. Thank sin advance!

Stevie Wisz

just kinetics.

Stevie Wisz

The slow step determines the rate law!! So, because it has 2 NO's the rate law is Rate=k[NO]^2.

Stevie Wisz

Laval said they would be given out after the lecture times on Wednesday!

Stevie Wisz

Thank you for the excellent response!^^

Stevie Wisz

The more complex the molecule is, the higher the molar entropy. SO, since CF4 is the molecule with largest size and most complex (more particles such as protons, electrons, etc) it has the highest entropy of the molecules given. I hope this helps!

Stevie Wisz

I was wondering, when calculating say enthalpy, when you express it in just kj and when you express it in kj/mol. On my quiz i was marked down for expressing it in units of kj but i am confused as to when i use just kj and when i use kj/mol.

Stevie Wisz

For this same problem, why is the, for step 2, the internal energy equal to -50 J?

Stevie Wisz

On 14.11 Homework problem it asks to write the half redox reactions in a galvanic cell which I know how to do, although I had a question regarding cell potential... if Ecell of Ni2+ (aq) + 2e- ---> Ni (s) is -.23 V, and you need the reverse reaction Ni(s)----> Ni2+ + 2e- would this reactions cell po...

Stevie Wisz

Oddly, it is backwards, so just remember that the species reduced is the oxidizing agent and the species oxidized is the reducing agent.

Stevie Wisz

This is super clever! Thank you!

Stevie Wisz

Most TA's are handing them back this week in discussion!

Stevie Wisz

In almost all cases they will indicate whether the process is reversible or irreversible. But, if not, know that reversible have infinitely small volume changes where as irreversible have fairly larger volume changes. Reversible have potential to shift back to their equilibrium conditions whereas ir...

Stevie Wisz

Commenting on this because I had the same question!

Stevie Wisz

That or the amounts of particles each contains (electrons, protons, etc), states of the molecules, or how complex each is.

Stevie Wisz

A change in 1 kelvin is the same as a change in one degree celsius, correct? Thanks!

Stevie Wisz

Yes! Entropy is a measurement of disorder of a system so if there is an increase in disorder there will be an increase in the entropy which results in a spontaneous reaction. If the entropy is negatively charged then the reaction is not spontaneous and there's a decrease in entropy, etc. Hope this h...

Stevie Wisz

Extenisve properties are dependent on how much material/substance is present. So, entropy is an extensive property because it is dependent on how much substance is present.

Stevie Wisz

Thank you!! :)

Stevie Wisz

So, when a compound has resonance, it typically has a higher entropy than a compound that does not have resonance?

Stevie Wisz

Is degeneracy related to residual entropy?

Stevie Wisz

never mind! i got it :D thank you haha

Stevie Wisz

I was wondering why the change of moles of the reaction CH4 + H2O YIELDS CO2 + 3 H2 was +2/3 moles? (with the production of 1 mole H2) This might be a dumb question because my brain is so fried but i cannot figure out why the delta n is 2/3.? Sorry and thanks ahead of time. :D

Stevie Wisz

Regarding this problem, I just need clarification.... the more energy/enthalpy the more stable the molecule? For instance, the benzene structure that is higher in kj is the most stable, correct? :)

Stevie Wisz

thank you!

Stevie Wisz

Thank you!!!

Stevie Wisz

In this question it has the reaction 4 C7H5N3O6 + 21 O2 yields 28 CO2 + 10 H2O + 6 N2 When calculating the enthalpy for the entire reaction you do the sum of the enthalpies of the products minus that of the reactants. Although in the solutions manual, when calculating that, the enthalpy of the N2 wa...

Stevie Wisz

In this question it has the reaction 4 C7H5N3O6 + 21 O2 yields 28 CO2 + 10 H2O + 6 N2 When calculating the enthalpy for the entire reaction you do the sum of the enthalpies of the products minus that of the reactants. Although in the solutions manual, when calculating that, the enthalpy of the N2 wa...

Stevie Wisz

Thank you!! I think I was confusing enthalpy with entropy!!!! After reading chapter 9 I realized that my idea of enthalpy was mixed up with that of entropy. Thanks, again! :)

Stevie Wisz

After reading chapter 8 and attending lecture, I struggled with understanding how the breakage of a bond is endothermic? The way my mind works (lol) is that when a bond breaks it would release energy and thus be exothermic and have a negative charged enthalpy. Same goes with the bond formation; I as...

Stevie Wisz

Can someone explain to me why KBr has a neutral ph? Problem 71 from the 5th edition textbooks asks you to determine if the pH of specific molecules is less than, equal to, or greater than 7 and i had a difficult time determining the pH of KBr. Thanks!

Stevie Wisz

Video for 2015 Midterm Question 2: Empirical and Molecular Formula

by Stevie Wisz and Naiomi Desai

Stevie Wisz

Alphabetize using the first letters of the ligands. Act as if there are no prefixes. Or in other words, ignore the prefixes and strictly pay attention to the first letters of the atoms not prefixes!

Stevie Wisz

I was wondering why, for number 3 on the second preparation Quiz for Quiz 3 in the workbook, why the chloride ion is listed before the ligand cyanide when naming the compound. I thought the ligand names go before the anions/metals? When i did the problem before checking my answer i had cyanochlorobi...

Stevie Wisz

i am commenting because i am stuck on this problem too.

Stevie Wisz

I was doing problem 17.31 from the textbook and was struggling with determining how to write the formulas without knowing if the compound inside the brackets has its own charge. For instance, pentaaminesulfatocoblalt (III) bromide: what is the correct formula? the inside's charge, when i calculated ...

Stevie Wisz

When Prof. Lavelle was going over how to calculate the concentrations of products/reactants using ICE Box method I was confused as to how you (for the change in concentration) get -X or +2X, etc. Can someone explain this a little more in depth please? I realize you look at the molar ratio but I just...

Stevie Wisz

Does it HAVE to be a question or can it be replying to other's questions? For some reason theres no where for me to post on my screen or i just don't know how to do it I guess so I just comment to others for points. Does that count?

Stevie Wisz

Bond order represents the number of bonds between two atoms/elements. So, because bond length decreases with multiplicity of bonds between two elements and increases with lesser amounts of bonds, the larger the Bond Order, the stronger the bond, the shorter the bond length and vice versa. Hope this ...

Stevie Wisz

This is awesome!! Thanks for the laugh, I really needed it after my long week!!!

Stevie Wisz

I have a similar question regarding the polarity of PCl5... when working on this problem on the midterm last week I initially put that it was a non polar molecule do it its dimple moments canceling out and then i changed it to polar because I thought the molecule's dipole moments do not completely c...

Stevie Wisz

Regarding a problem similar like this: if you're given an electron confined to a radius 150 pm and another confined to a radius of greater than 150 pm and you calculate the uncertainty in velocity, how would you determine in which atoms can the velocity of the electron be known with the highest prec...

Stevie Wisz

Lone pairs are pairs of electrons that are not bonded to any other elements. So, if the central atom contains a set of two electrons (pair) that are not bonded to any other element they are classified as a lone pair. With that said, if there is an elements that has multiple pairs of these lone pairs...

Stevie Wisz

so, say when comparing two resonance stuctures and everything is similar except one of the structures has a formal charge of -1 while the other has that of +1... what would be the more stable? the stucture with the positive 1? Thanks!

Stevie Wisz

i think i was having difficulty because my book is a different version......

Stevie Wisz

I am working on completing all of the assigned homework problems and have come across some such as numbers 33 and 37 who have been very difficult for me. This is because Lavelle has not gone over these types of calculations. Will we be required to know how to calculate these types of problem on our ...

Stevie Wisz

I am working on completing all of the assigned homework problems and have come across some such as numbers 33 and 37 who have been very difficult for me. This is because Lavelle has not gone over these types of calculations. Will we be required to know how to calculate these types of problem on our ...

Stevie Wisz

I recall Prof. Lavelle saying that we will not need to utilize the Schrodinger equation to calculate any values but will need to know just the basis and concept of it. Although, there was a problem assigned by Lavelle (#33) that required the use of the equation to calculate a specific value. I was v...

Stevie Wisz

I recall Prof. Lavelle saying that we will not need to utilize this equation to calculate any values but will need to know just the basis and concept of it. Although, there was a problem assigned by Lavelle that required the use of the equation to calculate a specific value. I was very confused by i...

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