CHEMISTRY COMMUNITY

simmoneokamoto3K

Professor Lavelle should let us know via email about review sessions and I think the UA, Lyndon Bui might also be planning a review sess as well.

simmoneokamoto3K

Professor Lavelle should let us know via email about review sessions and I think the UA, Lyndon Bui might also be planning a review sess as well.

simmoneokamoto3K

Hi, I was just wondering when we're supposed to get back Test 2 and also when and what the final will be covering? Thank you!

simmoneokamoto3K

Hi, I'm a bit confused if Coordination numbers and steric numbers are the same because I've looked it up on the internet and there are some resources that say they are the same while others say otherwise. Please advise, thanks!

simmoneokamoto3K

Are we going to get a sheet with all the electron shapes (Ex: tetrahedral, trigonal pyramidal) on test 2 or are we going to have to memorize them all?

simmoneokamoto3K

Hi, does anyone know what's the difference between finding the VSEPR model vs. finding the electron configuration because I'm a little confused. Furthermore, are the shapes of tetrahedral and trigonal pyramid the same, and why are they different from one another? Thank you!

simmoneokamoto3K

Hi, does anyone know what's the difference between finding the VSEPR model vs. finding the electron configuration because I'm a little confused. Furthermore, are the shapes of tetrahedral and trigonal pyramid the same, and why are they different from one another? Thank you!

simmoneokamoto3K

FOr this class at least, I don't think we'll go into too much depth why we use kg but just know that when you're solving an equation, the values of the mass should be in kg

simmoneokamoto3K

Because of their differing electronegativities, the atoms will never be nonpolar because they have differnet charges.

simmoneokamoto3K

I think we do have homework due but most TA's are lenient and some even let you digitally scan it and send it so just shoot an email to your TA.

simmoneokamoto3K

Test 2 is during week eight and tests all materials given to us after the midterm up to probably the monday and wednesday of that week. Hope this helps!

simmoneokamoto3K

As today in class, Professor Lavelle stated he was pleased with the average of the midterm, I think its unlikely that he'll curve the class, but like the others said CHem community and homework are both good cushions

simmoneokamoto3K

I tend to do it on a separate piece of paper and by the end of it, I box the entire lewis structure and write the overall formal charge in the upper right corner of said box.

simmoneokamoto3K

Yes , we shouldn't be worrying about lone pairs because professor lavelle mentioned that we only need to name the molecule.

simmoneokamoto3K

There are several general rules to help determine, and thus memorization is required. To determine the molecular shape, both lone pair electrons and bonding pair electrons need to be considered; professor Lavelle hasn't discussed this in lecture yet. However, to name the shape of the molecule, only...

simmoneokamoto3K

Matt Sanruk 4F wrote:These show detailed, step by step solutions?

Sometimes, it really depends on the type of question. For very simple questions, likely not, but for harder questions, yes most likely

simmoneokamoto3K

I believe the ground state refers to the initial state, so the state without any charges and without abbreviating it. It's almost like the full state of the electorn

simmoneokamoto3K

Yes, because you remove the electron from the highest orbital, the s orbital would be where you remove the electron first.

simmoneokamoto3K

There probably won't be another sect purely dedicated to fundamentals, however on the midterm, there generally aren't many fundamental problems for better or for worse, because they'll be focused on the newer material. Hope this helps!

simmoneokamoto3K

Our midterm is on November 6th however, the locations of said midterm have yet to be disclosed

simmoneokamoto3K

Midterm 1 will cover fundamentals, quantum and a little bit of chemical bonds

simmoneokamoto3K

Not to worry, the only thing necessary for Professor Lavelle's midterms are pens/pencils, a calculator and your bruin ID

simmoneokamoto3K

The questions from this week should be from quantum, but i recommend you put chemical bonds in your homework just so you can get the practice in.

simmoneokamoto3K

Generally, when balancing equations, the general rule is that the number of elements on one side should be exact to the number of elements on the other side, so if one element has even one more than the other side, that means you have to rethink the question. Hope this helps!

simmoneokamoto3K

There aren't any rules as to where to start putting electrons, however there are rules once we start learning about formal charge on what's the most ideal configuration of certain electrons to attain neutral charge, but don't worry about that for now.

simmoneokamoto3K

Unlike the other elements, boron is not one of the elements subject to the octet rule as it is more stable when it has 6 electrons rather than eight.

simmoneokamoto3K

you don't need to write x, y, or z next to your electron configurations. I think Dr. Lavelle just put that in lecture as extra information but for now dont' worry about it.

simmoneokamoto3K

ONce you get the base configuration, usually you don't want to have the long electron configuration, so we use the elements in the far-right column of the periodic table (starting with Helium and ending with Radon) for short-hand. Basically once you have the electron configuration, in the event that...

simmoneokamoto3K

Basically when it comes to electron configuration, we want to think of s, p, d, and f which can all hold a certain amount of electrons in them. If you reference our textbook (page 33) each orbital (s, p, d, f) has an L or "orbital angular momentum quantum number" so for each s, p, d, and f...

simmoneokamoto3K

The UA sessions and Step-up programs are very helpful as you get more one on one help rather than being in a massive class setting. I would also recommend going to O.H. of T.A.'s because they can be very helpful as they're grad students. If you're struggling with a specific topic though, the session...

simmoneokamoto3K

Generally, in this class we should put the d before the s, also because you can get deducted points in special cases where one orbital steals an electron from another (ex: 3d^2 4d^9 -> 3d^1 4 d^10). Hope this helps :)

simmoneokamoto3K

I don't think we need to know Wein's law. If we need to know a value, it'll be put on the equations sheet (where all the formulas, and values are put).

simmoneokamoto3K

I never did electron configurations in high school and I am super lost. In my notes I have that for carbon when there are 6 electrons, the configuration is 1s² 2s² 2px 2py. Could someone please explain to me where these numbers came from? To add to what the people are saying above, when I was initi...

simmoneokamoto3K

You should choose which equation to use based on what kind of energy it's asking for. Technically both equations are the same but you can substitute E(k) with 1/2mv^2. The discerning factor is what are the givens in the problem and what the problem asks for.

simmoneokamoto3K

Depends on how much detail you want to go into, but if we're speaking broadly, the two main categories are kinetic energy and potential energy. Kinetic energy is the energy that is released in movement, so if you're walking you're releasing kinetic energy. On the other hand, potential energy, as the...

simmoneokamoto3K

Basically you should draw it like how you would any normal lewis structure but depending if it has a negative charge or positive charge you remove or add molecules, so for negatively charged you add and vice-versa

simmoneokamoto3K

I wouldn't say you need to show all your work, but I definitely recommend it, in the worst case hypothetical you get the question wrong, you can, at the very least, get partial credit for showing your work.

simmoneokamoto3K

According to the TA, a subshell is a specific s or p, so how l can equal 0, 1, 2, or 3, while a shell is a principal quantum #, represented by n

simmoneokamoto3K

Hi, i'm a bit late for the midterm but i'm open to study for the final if you're down

simmoneokamoto3K

If you look at the constants and equations sheet, you can see the convertion factor from eV (volts) to J whcih is for 1 eV there are 1.602x10^-19 J

simmoneokamoto3K

First use the De Broglie equation as appropriate turning (lambda) = h/p into (lambda)= h/mv. Next convert the mass of an electron using your conversions, so here are 1000 g in one kg. Once converted you should be left with 9.10939x10^-31. Afterwards convert km into meters so that you're also using t...

simmoneokamoto3K

No, you would have to write out Ca as a ground configuration initially and then at the very end with your final electron configuration, remove two electrons as appropriate for Ca^2+

simmoneokamoto3K

The equation was for molarity which is M (molarity) = (moles)/(liters). If you have different measurements like mg you need to convert, so for question seven you needed to plug in the values after converting mg to liters.

simmoneokamoto3K

Cu and Cr are both special cases and the only special cases in that row. Basically, because Cu's configuration is 3d^9 and 4s^2, the 3d^9 steals an electron from 4s^2 turning it into 4d^10 and the same thing with Cr.

simmoneokamoto3K

Personally, I have a hardtime doing electron configuration the way the professor teaches us, so I watched this video and it helped make electron configuration easier especially with elements like Bi

https://www.youtube.com/watch?v=2AFPfg0Como

simmoneokamoto3K

I think it's a matter of when the atom is most stable, so we know ideally that an atom would like to fulfill the octet rule, using double bonds, single bonds, etc. or lone atom pairs but it's just a matter of when B is the central element, it will want to be as stable as possible.

simmoneokamoto3K

Actually the configuration for Cu is [Ar}3d^9 4s^2 but because 3d^9 is so close to have a complete shell it steals an electron from 4s^2 taking away one electron and reducing it to [Ar]3d^10 4s^1. Lastly because Cu^+ has the plus sign it means you're removing an electron versus in the hypothetical i...

simmoneokamoto3K

I prioritize valence electrons personally, because without the valence electrons, you can't calculate the formal charge technically

simmoneokamoto3K

I don't think so, but I think we do need to know the different types of orbitals like s, p, d and f.

simmoneokamoto3K

Vacuum is basically just referring to an enclosed sapce, so for example space is also a vacuum. We need a vacuum though because without it, the experiment will have other external forces interfering like the presence of air molecules. Because the photo electric effect centers on the idea of electron...

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