CHEMISTRY COMMUNITY

Mrudula Akkinepally

Hello everyone!

During Justin's step-up section this morning, he said that we need additional information to be able to solve for pKa given the pH and pH given pKa.

I was wondering what that additional information is.

Please let me know!

Thank you :)

Mrudula Akkinepally

Hello everyone!

I know this might sound stupid but what's the point of conjugate acids and bases? Like I know it's just the terminology, but why does it have a name? Do they serve a purpose aside from being a base's/acid's counterpart in a reaction?

Please let me know!

Thank you :)

Mrudula Akkinepally

Hi!

Do you guys think its important to know the difference between the Lewis and Bronsted definitions for acids and bases for this class?

Let me know! Thank you :)

Mrudula Akkinepally

Hello!

What pka values are indicative of a strong acid? What pkb values are indicative of a strong base?

Please let me know! Thank you :)

Mrudula Akkinepally

Hello everyone!

I know that pka is the negative log of ka, but how do we go from pka to ka?

Thank you :)

Mrudula Akkinepally

omg thank you so much!

Mrudula Akkinepally

Hi everyone!

After taking chem 14a, I realized that I need to do better with studying.

I was wondering if any of you had any suggestions on new study habits or study habits to leave in 2020.

Please let me know!

Thank you :)

Mrudula Akkinepally

Hi everyone!

I just wanted to confirm that we haven't gone over ice tables in lecture yet, right?

We talked about them during my discussion section and they showed up on sapling but I don't remember them from lecture.

Please let me know!

Thank you

Mrudula Akkinepally

Hello everyone!

I hope everyone had a fun holiday season and a happy new year!

I was wondering what topics we need to have memorized from chem 14a for chem 14b.

Please let me know!

Thank you :)

Mrudula Akkinepally

What happens to a system at equilibrium when there is an increase in temperature? Will it favor products or reactants? Will Q be greater than, less than, or equal to K?

I don't remember this from lecture. I don't think we covered it yet lol.

But if you know, please let me know!

Thank you :)

Mrudula Akkinepally

Hi everyone!

I'm having trouble solving a sapling problem and I was wondering if someone can help me figure it out!

The problem:

My work:

Thank you :)

Mrudula Akkinepally

Darren1e wrote:This is a great tip! Has anyone come up with one for strong bases?

I just saw this!! But I think if it has an OH in there its a strong base. And if it has an N with a lone pair then its weak.

Mrudula Akkinepally

Faaizah Arshad 1E wrote:That's a great mneumonic,. Heads up that HClO3 is also a strong acid; you left that out in the list.

I just added it!! Thank you for telling me :)

Mrudula Akkinepally

I went to A UA session yesterday where we were given a really useful pneumonic to remember the names of the strong acids.

SO I Brought NO CLean ClOthes.

SO: H2SO4
I: HI
Br: HBr
NO: HNO3
Cl: HCL
ClO: HClO4 and HClO3

I hope it helps!! :))

Mrudula Akkinepally

Mrudula Akkinepally

Hi everyone!! I know that finals are really stressful, and if you're like me then you need to get a really good score on the final to get an A in the class. But I think it's really important to forget about the grade for a minute and try your best to understand the material because your grade in the...

Mrudula Akkinepally

Hello! I was wondering if someone had a way to memorize the difference between a Lewis Acid/Base vs a Bronsted Acid/Base. I know that if a molecule is a Lewis Acid, it's also a Bronsted Acid, and that the lewis definition has to do with electrons while the bronsted definition has to do with protons....

Mrudula Akkinepally

Hi everyone!

I'm having trouble watching our lectures and I was wondering if everyone is also getting an error code? If you were able to overcome the error, do you mind sharing what you did ??

Please and thank you :)

Mrudula Akkinepally

Why is the charge of Cobalt +3 and not +2 in [Co(NH3) 3Cl3]?

Mrudula Akkinepally

Lol, I just watched the lecture again. It's because the bond length between hydrogen and bromine is shorter than the one between hydrogen and chlorine. A larger bond length means a weaker bond. So in the presence of water, it's easier to break the bond between hydrogen and bromine in comparison to h...

Mrudula Akkinepally

Can someone explain to me how we can determine which one of these is a stronger acid based on periodic trends? Lecture 26 mentions bond lengths but I'm still not too sure.

Thank you!

Mrudula Akkinepally

In lecture 26, Dr. Lavelle drew a Lewis structure and identified that it was in the gas state. I just want to clarify that we don't know how to determine the state of a molecule solely based on its Lewis Structure, right? Follow up question: how would we determine what state a molecule is in? Like w...

Mrudula Akkinepally

Do we need to know the mechanisms of myoglobin, hemoglobin, and the heme complex? Or do we just need to recognize them as a biological application of coordination compounds?

Mrudula Akkinepally

Hi guys! I was wondering what the difference between UA and Step Up sessions is. Please let me know ! Thank you!

Mrudula Akkinepally

How do we determine where the negative pole of a molecule is based on its structure?

Mrudula Akkinepally

After taking the two midterms, I realized that whatever I'm doing to study needs a little but more help. I heard a lot of people saying that the step up/UA sessions are worth trying out. However I'm a little unsure of what to expect. What do you guys do in them? Do you personally find them helpful? ...

Mrudula Akkinepally

In lecture 23, Dr. Lavelle says that the electron configuration of Nitrogen would not give the proper structure of NH3 so we invoke hypridization and create the 2sp3 state. I was wondering if someone could explain how we know when to invoke hybridization if we don't know what the proper structure of...

Mrudula Akkinepally

In lecture 22, Dr. Lavelle says that sigma bonds are characterized by electron density with cylindrical symmetry and I was wondering if someone could illustrate what that means. Thank you!

Mrudula Akkinepally

Hi everyone! In lecture 21, I noticed that the lone pairs for an H2O molecule are right next to each other on the O atom, while two lone pairs are on opposite ends of a xenon atom in a XeF4 molecule. I was wondering why that is. Does it have to do with the fact that Xe is a noble gas?

Mrudula Akkinepally

I was wondering the same thing! I hope we don’t, but we might just because they’re recorded and we don’t necessarily have to watch it on Friday .

Mrudula Akkinepally

I think doing the homework will definitely help, but I personally find flash cards to be the best way to do it. Quizlet is perfectly fine, but a lot of people rave about this app called aanki ( don’t quote me on the spelling lol) if you want to try it out!

Mrudula Akkinepally

12 units to be considered a full time student!

Mrudula Akkinepally

The night before the exam do something that calms you down. For example, I like to do a face mask and watch my favorite show while not worrying about anything else. And then don’t study the day of the test!! I know it can be difficult but you’ll psych yourself out. Just prep leading up to it but rel...

Mrudula Akkinepally

Do we need to memorize that a tetrahedral bond angle is 109.5 degrees if all the atoms bonded to the central atom are the same. Dr. Lavelle approximated the bond angle for trigonal pyramidal from the bond angle of tetrahedral.

Mrudula Akkinepally

Will midterm 2 be formatted just like midterm 1? In the sense that it will be multiple choice, we will be given partial credit for certain answers, and there will be around 12 questions? Also, will we also take it like Midterm 1 where we signed into zoom on our phones and took the midterm through re...

Mrudula Akkinepally

Hi! I was wondering if we needed to memorize oxidation numbers for any elements to prepare for the midterm or if they will be given to us on the midterm as needed?

Mrudula Akkinepally

That helps a lot, thank you !

Mrudula Akkinepally

I can understand why CH₃ CHO has dipole-dipole forces, but can someone explain why it also has dispersion forces? I read the explanation that Sapling gave me but I still didn't understand.

Mrudula Akkinepally

Petition for Dr. Lavelle to make a Lecture Bops Playlist! I can't help but bop my head along at the beginning of every lecture and I think it would be pretty cool to just have a spotify playlist of those songs.

Mrudula Akkinepally

Can someone explain to me how to calculate the oxidation number and what it means?

Mrudula Akkinepally

Hi! I was wondering if the length of double bonds is always 0.2 Å shorter than that of a single bond. For example, a C-C single bond has a length of 1.54 Å while a double bond is 1.34 Å. Similarly an N-O single bond has a length of 1.40 Å while a double bond is 1.20 Å. I'm not sure if this was just ...

Mrudula Akkinepally

Hi! They are exceptions to the octet rule because of their limited number of valence electrons.

Mrudula Akkinepally

Double bonds are shorter than single bonds because they have a stronger force and therefore hold each other closer.

Mrudula Akkinepally

I'll follow green.

Also this is so fun!!

Mrudula Akkinepally

As far as I understand, it will be the same format.

Mrudula Akkinepally

Do we get points for every post we make? Because people are saying to just look under yours posts to see our participation points.

Mrudula Akkinepally

I'm not too sure, but I feel like we will find out before our next midterm so we can calculate what we need to get on that to maintain/improve our grade.

Mrudula Akkinepally

I was a little confused too when I saw the question on the Sapling homework. How I went about it was to think about how an excited electron would be in the highest energy shell. So if it were to go to its ground state, that electron would come back down and lose the highest energy shell. Then I look...

Mrudula Akkinepally

I wrote the s orbital first in high school too. However, I think we are expected to write the d orbital first because it has a lower energy than s.

Mrudula Akkinepally

It takes more energy to pull apart ionic bonds than covalent bonds. Therefore, ionic bonds are stronger.

Mrudula Akkinepally

For the midterm next week, do we need to know the frequency and wavelengths of different types of lights on the spectrum or just the wavelengths?

Mrudula Akkinepally

Hi! So for the first midterm do we just have to memorize what part of the light spectrum visible light is in, or the specific wavelength of each color? For example, do we need to know the wavelength of red specifically, or can we just know that visible light ranges from 380 nm to 700 nm?

Mrudula Akkinepally

Thank you for your responses! I realized that my error was in my conversion from cm to m. It was a very simple error but it threw off my whole calculation!

Mrudula Akkinepally

Hi everyone! I came across this question while taking the assessments associated with the modules on Dr. Lavelle's website and I'm not sure how to solve this. I am pasting the question below! The meter was defined in 1963 as 1,650,763.73 wavelengths of radiation emitted by krypton-86 (it has since b...

Mrudula Akkinepally

Hi! Do we have to memorize the mass of an electron? Or will that be given to us on the formula sheet?

Mrudula Akkinepally

I'm stuck on this problem and I was hoping I could get some of your help! So the question asks how many photons are required for the liquid to absorb 30.59 J of heat. I started by finding the energy of the photon and ended up with 3.49 x 10^-24 J. I then divided 30.59 J by 3.49 x 10^-24 J and ended ...

Mrudula Akkinepally

I wondered the same thing! Normally, if the entire process was correct and just the sig figs were off, I was given partial credit. But I'm not sure how Dr. Lavelle grades his exams.

Mrudula Akkinepally

I personally didn't get penalized for taking a hint or attempting a problem multiple times! I think the point is to simply help you understand how to approach a problem

Mrudula Akkinepally

Which polyatomic ions would be considered basic ones to memorize?

Mrudula Akkinepally

No, I don't think so. As far as I understood, excited electrons always come back to their ground state.

Mrudula Akkinepally

If the question does not specify the units your answer should be in, then it shouldn't matter whether you answer with m or nm.

Mrudula Akkinepally

Hello! I noticed that discussion 3E did not have a groupchat on GroupMe so I created it! Here's the link incase anyone needs it :)

https://web.groupme.com/join_group/63275109/C4FLReya

Mrudula Akkinepally

I don't think so! I looked in the big GroupMe chat and no one mentioned it. I'm not personally in that discussion but I think it would be a good idea to create the chat!

Mrudula Akkinepally

Yes! His intro always hyped me up!! Please bring back the music!

Mrudula Akkinepally

Awesome, Thank you guys so much for responding !

Mrudula Akkinepally

I'm not sure whether this question has been asked and answered, however I was wondering if we had to make 5 new posts every week on this website to receive participation points for the week, or if replies to previously made posts count as credit. Please let me know! Thank you!

Mrudula Akkinepally

So final update on this, I did it! Thank you all for your help!

Mrudula Akkinepally

Hi! So after I read your responses I went back and googled the molar masses one more time to see how I butchered them so horribly. It has come to my attention that I was looking at the molar mass of 3-ETHYL-3-haxanol instead of 3-METHYL-3-hexanol. Totally my fault! Thank you for your responses thoug...

Mrudula Akkinepally

I think my issue has to do the values I'm using for the molar masses of 2-butanone and 3-methyl-3-hexanol. When I googled the molar mass of 2-butanone it said that it was 72.11 g/mol, however when I calculated it myself it came out to be 72.12 g/mol. With 3-methyl-3-hexanol, it was 130.23 g/mol on g...

Mrudula Akkinepally

Hi! So I'm in the process of completing the Sapling assignment for week one. However, I am stuck on the question 10 and can't seem to do it right. Did any of you run into the same problem as me? If yes, then what did you do to overcome it? If not, then what did you do to begin with?

Search found 70 matches