CHEMISTRY COMMUNITY

Jessica Manriquez 1H

Kailani_Dial_3G wrote:Aqua is when it is in the brackets of the coordiantion compound. Hydrates is when it is on the outside of the brackets.

Thank you !!!

Jessica Manriquez 1H

Hi everyone! happy week 10 :)
I was wondering if anyone knew when we would name water hydro vs aqua when naming a coordination compound? Thanks in advance :)

Jessica Manriquez 1H

Hi everyone! Im having a hard time with polydentate ligands and was wondering if anyone had a good way to remember/identify them in a given problem. Thanks all in advance :)

Jessica Manriquez 1H

yes thats completely right !!

Jessica Manriquez 1H

(en) is short for ethylenediamine and it is a bidentate ligand

Jessica Manriquez 1H

I think it would be really helpful to look at the subscripts of the different compounds attached to the TM; I noticed you basically followed this rule, the only one you have wrong is [Co(SO4)(NH3)5], for this one if you look at the subscripts you would see the you have 5 ammonia, and 1 sulfate; ther...

Jessica Manriquez 1H

Nancy Yao wrote:December is so intense.

I completely agree, I'm mentally drained lol

Jessica Manriquez 1H

Jayden_Yamasaki_2J wrote:I think if a ligand is greater than monodentate it will form more than 1 bond. For example a bidentate would form 2 bonds and a tridentate would form 3. This increased number of bonds would also then change the coordination number.

Thank you :))

Jessica Manriquez 1H

Hi all, I had a question regarding coordination number on ligands that are greater than monodentate, since these can form more than 1 bond, would the coordination number change or would it still count as one bond? Thank you in advance.

Jessica Manriquez 1H

A delocalized pi bond would occur in a molecule with resonance structures, where the pi bond in shared amongst the molecules. An example of this is benzene, where the Carbons the same 3 pi bonds the C-C bonds are somewhere between single and double bonds. A regular, localized pi bond is confined wi...

Jessica Manriquez 1H

Hi all! Im sure this has been asked before but can someone please explain the difference between a delocalized pi bond and a regular pi bond. Thank you in advance. :)

Jessica Manriquez 1H

Since lone pairs have very high repulsion, they push bonding pairs away from themselves and closer to other bonding pairs, therefore decreased bond angles between them. Hope this helped :)

Jessica Manriquez 1H

Im pretty sure this one would be square planar, due to the fact that it follows the formula AX4E2, which means 4 bonded and 2 lone pairs, and its similar to the xenon tetrafluoride example Dr. Lavelle went Over in lecture 21; Hope this helped :)

Jessica Manriquez 1H

Hi! my TA mentioned that for this midterm we are not required to memorize any formulas and that Dr. Lavelle will provide us with the written formulas; Hope this helped :)

Jessica Manriquez 1H

Hi! Dr. Lavelle has mentioned that the least electronegative molecule will be placed in the center of a Lewis structure. Hope this helped :)

Jessica Manriquez 1H

Lewis acids are elements that accept an e- while bases are those that donate e-

Jessica Manriquez 1H

https://sciencenotes.org/periodicity-de ... chemistry/
the main picture in this website really helped me memorize the trends; Hope this helped :)

Jessica Manriquez 1H

the one with the formal charge that is closest to 0

Jessica Manriquez 1H

Adding to this, my TA said Dr. Lavelle will specify the formulas we need in the problem, we wont be expected to memorize any; Hope this helped :)

Jessica Manriquez 1H

Like most people have said, i don't think we necessarily have to know how to calculate the bond length, but we should know which bonds are longer and which bonds are shorter; so for example double bonds are shorter than single bonds, but triple bonds are shorter than double bonds, single bonds are a...

Jessica Manriquez 1H

Hi all! Im kind of confused on the interpretation of London forces, and was wondering if anyone has good way to distinguish these from other types of bonds. Thank you in advance :)

Jessica Manriquez 1H

Just an attraction;

Jessica Manriquez 1H

Hi all! im sure this has been asked before, but how do we know which elements are exceptions to the octet rule?
Thanks in advance :)

Jessica Manriquez 1H

electron affinity relates to the amount of energy released when an electron binds to an element; electronegativity relates to how well an atom can attract an atom.
hope this helped :)

Jessica Manriquez 1H

https://www.youtube.com/watch?v=CP35NuspGlk
I personally found this video extremely helpful, it really helped solidify the concept of n,l,ml
Hope this helped :)

Jessica Manriquez 1H

I have found the textbook problems to be the most helpful form of review; there are quite many so by the time you finish most of them you have a good understanding of the concepts and how to apply them. There is also an answer sheet so that you could check and compare your answers which is also a he...

Jessica Manriquez 1H

Since fluorine has more electrons and protons, it has a greater effective nuclear charge; this means that the electrons in the fluorine atom will be closer to the nucleus, making it harder to remove them. Although oxygen has a smaller atomic radius than nitrogen, nitrogen has balanced px,py,pz subl...

Jessica Manriquez 1H

Hi can someone explain why oxygen would have a lower 1st ionization than both Nitrogen and fluorine? Thank you in advance :)

Jessica Manriquez 1H

So since d orbitals can hold 10 electrons when an element in the d orbital is close to having a half full (5) or full (10) d subshell, it takes an electron from the preceding s orbital to make the element more stable. Dr. Lavelle mentioned that this was done for symmetry reasons, since it makes more...

Jessica Manriquez 1H

I would strongly suggest reviewing the textbook outline problems, they facilitate how to approach a problem. Theres answer key for the textbook problems so that you could see how they work out the answer if you're unsure of how to approach a problem; Hope this helped :)

Jessica Manriquez 1H

Many people have mentioned that the scores will be released after every discussion section has taken their midterm, however this is not confirmed by Dr. Lavelle , so as of right now no one really knows when they'll be released. Hope this helped. :)

Jessica Manriquez 1H

I associate De Broglie with velocity, so if I see a question asking for the wavelength of an electron going at a certain speed, I immediately think of De Broglie; Hope this helped :)

Jessica Manriquez 1H

hi! someone had mentioned doing problems 1-10, 12, 14, 19, 22-27, which are what will be covered in MT1; hope this helped :)

Jessica Manriquez 1H

Perfect!! thank you!

Jessica Manriquez 1H

Hi everyone! im kind of lost on how to start this problem and was looking for any guidance; thanks in advance. :) The E.coli bacterium is about 2.0 μmlong. Suppose you want to study it using photons of that wavelength or electrons having that de Broglie wavelength. What is the energy Ephoton of the ...

Jessica Manriquez 1H

Mine are also still shuffled, however someone had mentioned doing problems 1-10, 12, 14, 19, 22-27, which are what will be covered in MT1; hope this helped :)

Jessica Manriquez 1H

Hi, I'm not sure if this has been asked/answered before, but I was wondering if there will be more modules posted for these upcoming lectures. I personally found the modules extremely helpful and they really helped solidify the content of the lectures, so I'm wondering if there will be more in the f...

Jessica Manriquez 1H

the midterm is during your discussion time next week; Hope this helped :)

Jessica Manriquez 1H

The mass of an electron is a set value, so it will always be 9.1 x 10^-31 kg. Hope this helped :)

Jessica Manriquez 1H

Hi, I'm not sure if this has been asked or answered before but, after you find the delta e of an equation, in terms of delta E= -(h*R)/n^2, and it comes out negative due to the loss of energy, how come you lose the negative sign if they're asking for the frequency? Thanks in advance.

Jessica Manriquez 1H

I remember Dr.Lavelle mentioning black body radiation will not be included in the scope of 14A

Jessica Manriquez 1H

I think it would be up to week 3 material; hope this helped

Jessica Manriquez 1H

electrons would be ejected when talking about the photoelectric effect, which is why the detector served to couldn't the number of electrons that were ejected; in the atomic spectroscopy experiment youre basically trying to measure at which frequency the electrons get excited into a next level; henc...

Jessica Manriquez 1H

Yes, the threshold and work function basically mean the same thing. Threshold was used when the experiment was first conducted, but now its more commonly known as the work function.

Jessica Manriquez 1H · Re: Homework Due Time I'm pretty sure they mean tomorrow (Sunday) at 11:59pm.

I'm pretty sure they mean tomorrow (Sunday) at 11:59pm.

Jessica Manriquez 1H

I find it really helpful to list right underneath how many units of each element you have, and that way try to figure out how many you would need to make them balanced, after that I go back plug in the values I came up with and then see if it works out.

Jessica Manriquez 1H

Hi! I'm not sure if this has been answered before, but will the midterms/final be open book or not? thanks in advance :)

Jessica Manriquez 1H

I completely agree; seeing Dr. Lavelle vibe to the music prepared me for the content of the lectures.

Jessica Manriquez 1H

Hi! grades should be posted on CCLE on the grades section; they should also appear on MyUCLA. I have found that some professors update grades on CCLE before they do on MyUCLA. Hope this helped.

Jessica Manriquez 1H

I agree with the previous posts; you don't necessarily have to arrive with a question ready, its very helpful to hear other student's questions which could clarify any of your own questions. Sometimes people stray away from attending OH because they feel as though they need to have questions ready t...

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