CHEMISTRY COMMUNITY

Jessica Hu 3L

Then to clarify, a ring is what is a chelate? and that forms when it's a ligand-spare atom-spare atom-same ligand?

Jessica Hu 3L

Hi! how can we tell how many sites a ligand will bond to (for example the difference between a monodentate and a bidentate?) And how much will we need to know for this final exam?

Jessica Hu 3L

What's the reasoning again for Oxygen having a lower ionization energy than Nitrogen?

Jessica Hu 3L

I'm having a little trouble figuring out what the limiting reactant would be

Jessica Hu 3L

Okay thanks so much!

Jessica Hu 3L

Should we know anything about how acids are named?

Jessica Hu 3L

Honestly it could take longer than a week. Depends on the prof, but I've def been in classes where it took longer than a week to know our final grade lol.

Jessica Hu 3L

If it was just a today problem, CCLE and MyUCLA servers have been wonky today. But if it's something that is occurs often, I would contact the IT office if possible.

Jessica Hu 3L

How much of naming compounds should we know for the final and how are you guys studying for that section? (i.e. do we need to memorize stuff)

Jessica Hu 3L

Not totally related, but for some of those having a problem with answering on sapling, also make sure you don't put spaces. I had tetra-ammine dichloro copper (III) chloride and they didn't take it until I changed it to tetraamminedichloro copper (III) chloride.

Jessica Hu 3L

Hi! One of the UA worksheets (I believe Riya's Week 5 worksheet) explains that the ionization enthalpy of Ga is higher than Al because the 3d-subshell is unable to completely shield the valence electrons. This also applies to Ti having a higher ionization enthalpy than In (ineffective shielding of ...

Jessica Hu 3L

Most likely just textbook problems and UA sessions again.

Jessica Hu 3L

Figure out how many valence electrons there would be.

As is the center atom and the oxygen atoms should center around it. It should be pretty easily deducible from there.

Jessica Hu 3L

Echoing what the person above me said, just think about the different bonds you can use between carbons and also whether you can make it a ring structure.

Jessica Hu 3L

Think about the electronegativity difference between atoms and whether these polar dipoles will cancel each other out.

Jessica Hu 3L

Oh okay thanks!

Jessica Hu 3L

I usually like to think of it by looking at the Lewis structures. If there are lone pairs, then they tend to be bases since those lone pairs will often contribute to a bond between that ion and another ion. On the other hand, if an ion doesn't have a full octet (for example, if it has a central Boro...

Jessica Hu 3L

Hi! I understand how to get the hybridization of a given atom through counting bonds and lone pairs etc but can someone kind of explain the concept of hybridization a little bit more to me since I still don't quite understand how it works.

Jessica Hu 3L

While studying, don't be afraid to take breaks. If you overload too much, it can cause mental strain. Additionally, during the exam itself don't think about how fast or slow you're going as that can also stress you out.

Jessica Hu 3L

Do you guys recommend reading through the textbook too, or just doing the problems? I haven't really been reading the textbook to prepare for the midterms, but I was wondering if others find that helpful as well? I usually just skim the textbook because it's a helpful review of the lectures. Ah I s...

Jessica Hu 3L

Do you guys recommend reading through the textbook too, or just doing the problems? I haven't really been reading the textbook to prepare for the midterms, but I was wondering if others find that helpful as well?

Jessica Hu 3L

There is technically a Sapling assignment for every week's material, but it's not necessarily due every week. As other replies have mentioned above, the Week 7 and Week 8 material have a sapling assignment that will be due next Sunday!

Jessica Hu 3L

Hi! One of the UA worksheets (I believe Riya's Week 5 worksheet) explains that the ionization enthalpy of Ga is higher than Al because the 3d-subshell is unable to completely shield the valence electrons. This also applies to Ti having a higher ionization enthalpy than In (ineffective shielding of e...

Jessica Hu 3L

What about the elements below Oxygen also in Group 16, such as Sulfur? Wouldn't they also encounter a similar situation?

Jessica Hu 3L

Hi! I was just wondering how yall were studying for this exam/what you thought helped the most for your first midterm? I've attended a couple UA sessions and I didn't have too much trouble with the Sapling but yea I would love to hear what else you guys did.

Jessica Hu 3L

Adding onto this, I ended up figuring this out, but I'm still confused about the exact number, I counted the atoms most likely to form a Hydrogen bond but that number was less than the number I ended up getting. The exact amount is 8 I'm pretty sure. For each hydrogen atoms, the oxygen in a water m...

Jessica Hu 3L

Adding onto this, I ended up figuring this out, but I'm still confused about the exact number, I counted the atoms most likely to form a Hydrogen bond but that number was less than the number I ended up getting.

Jessica Hu 3L

I think also a good way to think about it is as if the energy from all the electrons are distributed between more atoms, which lowers the energy magnitude of the entire molecule. it's also important to remember that resonance structures represent a singular molecule.

Jessica Hu 3L

Ok thanks so much!

Jessica Hu 3L

Hi so I know that resonance occurs when you can place electrons in different locations (i.e the double bond can go anywhere), but does this imply that every structure with this characteristic has a hybrid/partial bond?

Jessica Hu 3L

I was just wondering if anyone had a way to better memorize/understand the trends in the periodic table? I always end up confusing myself.

Jessica Hu 3L

Wait I thought the expanded octets were only for certain elements, not anything past the 2nd row?

Jessica Hu 3L

I'm pretty sure he's specified before that we should only worry up to the d orbitals.

Jessica Hu 3L

Thanks everyone!

Jessica Hu 3L

okay thank you!

Jessica Hu 3L

can someone explain why 4s and 3d sometimes are flipped in order?

Jessica Hu 3L

Hopefully soon but probably not until end of this week

Jessica Hu 3L

If you're given a wavelength and energy required to absorb the radiation, how can you tell how many photons you need?

Jessica Hu 3L

I might be wrong, but I believe that schrodinger's more or less tells us which orbital an electron is located in. I don't know if a comparison can really be made between it and the lewis dot diagram which just gives us a representation of an atom's valence electrons.

Jessica Hu 3L

Regardless of the precise constant you use, the test is multiple choice, therefore your answer should be close enough to one of the options given.

Jessica Hu 3L

I believe that the light/color you see when you shine light on an object is actually a separate process from the photoelectric effect and has more to do with how our eyes interpret light; the object isn't necessarily continuously emitting light. Hope that makes sense!

Jessica Hu 3L

Oooh okay thanks guys!Also I believe that there won't be partial credit since everything seems to be multiple choice.

Jessica Hu 3L

Hi would we be allowed to use an ipad/tablet to do work our work when completing the exam? Or is it preferred for us to use paper and pen?

Jessica Hu 3L

So is the shorter the wavelength -> the higher the frequency-> the higher the energy? Or am I misunderstanding ?

Jessica Hu 3L

Wow, there are definitely a lot of good ideas here. Personally, I find that practice problems always help me the most (this goes for every stem subject I've been in). I've actually never been to a step-up session but will def consider going at some point. But yes, 100% practice.

Jessica Hu 3L

Can someone explain the difference between the intensity of light and its energy? I'm not sure I understand it completely.

Jessica Hu 3L

Hey Kiana! I'm also a second year in Lecture 3:)

Jessica Hu 3L

I definitely think using an ipad had made organization a lot easier, and since I personally use notability, I'm able to back it up to drive immediately (I'm not sure about other apps). TBH this has been easier for me especially if some classes have premade note templates or slides, so I can just dow...

Jessica Hu 3L

The empirical formula should just be the simplified version of the molecular formula. The ratio of each element should stay the same so essentially you would be reducing the formula to the lowest whole number integers if that makes sense. For example, C₄H₈O₄ would be reduced to CH₂O.

Jessica Hu 3L

Hi I'd love to be apart of this group!

Jessica Hu 3L

So, just to clarify, we don't have to do anything with the given structures? Is the only way to solve this problem through searching up the molar mass?

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