CHEMISTRY COMMUNITY

Kate Manganaro 1F

Paywand,
From the definitions given to us in class by Dr. Lavelle, Lewis acids are electron acceptors, meaning it wouldn't make sense for them to be negatively charged because a negatively charged atoms or molecules wouldn't want more electrons.
Hope this helps!
Kate Manganaro

Kate Manganaro 1F

Hello, I am confused on how the shape of ICl2- is linear and is not bent/angular. This molecule has 3 lone pairs, so it only seems logical that they wouldn't be distributed equally so that the two chlorines can be straight. Am I just thinking of this wrong? Can someone please explain how linear is t...

Kate Manganaro 1F

Hello,
HBr is the acid in this example and KOH is the base.
Hope this helps!

Kate Manganaro 1F

Hello,
I like to think about it in terms of charges. If an acid is a proton, which is positively charged, it is an electron acceptor (electrons have a negative charge).
Hope this helps!

Kate Manganaro 1F

Hello,
Ka is essentially a measure of how strong an acid is in a solution. It is equal to ([A-][H+])/[AH].
Hope this helps!

Kate Manganaro 1F

In order to determine if the shape of a molecule is bent or angular, one needs to determine if a lone pair or lone pairs are present.

Kate Manganaro 1F

Hello! I'm assuming you have a basic understanding of hybrid orbitals from the various links that other students have provided. With this assumption, I will explain a little about the way I think of things. First, I count the regions of electron density around the central atom. After doing this, you...

Kate Manganaro 1F

Hello,
I am quite confused on what exactly London Forces are. Do we need to be able to identify them specifically? If so, how would we do that?
Thank you!

Kate Manganaro 1F

Hello -- VSEPR Model stands for Valence-Shell Electron-Pair Repulsion Model. For each molecule, this molecule illustrates the location of bonding electrons and lone pairs with respect to the central atom. Bonding pair electrons and lone pair electrons repel each other, so the VSEPR Model takes this ...

Kate Manganaro 1F

When denoting how many electrons there are in the VSEPR model with E (lone pair electrons) and X (bonding pair electrons), the number would always be subscript. Hope this helps!

Kate Manganaro 1F

There are other possible shapes, but we would just need to know the ones in the book which Dr. Lavelle went over in class.

Kate Manganaro 1F

Yes, we went over concepts/content from chapter three in these lectures.

Kate Manganaro 1F

You place the double and triple bonds wherever necessary to make the formal charges as low as possible.

Kate Manganaro 1F

Another thing to remember is that it is okay if Boron and the other elements in its column don't necessarily need to fill their octets.

Kate Manganaro 1F

In high school I learned a different equation for the formal charge. It is FC = valence e- - owned e- (the electrons that the atom has in the structure. The equation we learned in class is FC = VE - NE - 1/2 * BE. I believe you get the same answer either way, but is one equation more reliable to use...

Kate Manganaro 1F

There's no particular order you just have to make sure that the electrons are balanced and that you use all of the valence electrons and additional electrons that you get from the problem.

Kate Manganaro 1F

In lecture on Friday one of the TA's said that Dr. Lavelle will likely ask us to do that on one or two of the problems on the test but it would be excessive to ask us on all of them.

Kate Manganaro 1F

As seen in the equation c=λ v (speed of light = wavelength * frequency), the wavelength and the frequency have an inversely proportional relationship. This means that as the wavelength gets longer, the frequency gets smaller, and vice versa.

Kate Manganaro 1F

An 4s orbital has higher energy than a 3d orbital so you would write the 3d orbital before the 4s orbital. This works the same way with the 4d and 5s orbitals and so on. Hope this helps!

Kate Manganaro 1F

The reasoning primarily has to do with the amount of protons. As you move across the periodic table the atomic number gets higher, for example, Oxygen=8, Fluorine=9, and Neon=10. These numbers directly correlate with the number of protons in the nucleus. Because opposites attract, the more positive ...

Kate Manganaro 1F

We use lobes to know the general shape of the potential pathway of an electron.

Kate Manganaro 1F

Hello Amanda, Susu is right, they all increase. When an electron jumps orbitals, like from s to p, the energy is increasing. This would make a yes. When this electron makes this jump, the electron goes from originally having values of n=1 and l=0 to n=2 and l=1, so this makes b and c yes. Lastly, be...

Kate Manganaro 1F

Today in lecture, Dr. Lavelle made an analogy about orbitals, saying that we shouldn't think of orbitals as hotel rooms that exist and that the electrons "stay in". For clarification, does this imply that the states exist because the electrons are there? Or is there some other reason that ...

Kate Manganaro 1F

I don't believe that they're interchangeable per say, but they're associated with one another.

Kate Manganaro 1F

Both formulas are calculating wavelength, but De Broglie's equation only applies to certain things, specifically objects with mass, so not to light, because light doesn't have mass. The wavelength equation, on the other hand, can calculate the wavelength of both objects with mass and of light.

Kate Manganaro 1F

The best formula to represent this is the kinetic energy equation, E(k)=1/2(mv^2). This is because the light wave must have a certain frequency threshold in order to eject electrons off a certain metal. This varies for various metals, but an increase of brightness of light that you know will eject t...

Kate Manganaro 1F

I believe that in scenarios where the light intensity is extremely high it is possible but this is very unlikely so we ignore it. The reason is mainly because photons don't continue to stick to the electron, it stays for only a short period of time. Basically, photons aren't affecting electrons at t...

Kate Manganaro 1F

Planck's constant is used in the equation E=hv where E is the amount of energy, h is Planck's Constant, and v is the frequency of the wave.

Kate Manganaro 1F

From my understanding, Planck's Constant, 6.626 x 10^-34 J*s is just how energy and the frequency of an electromagnetic wave are related to each other.

Kate Manganaro 1F

So is Avogadro's Number used only when converting from moles to atoms or can it be used to convert from moles to molecules as well?

Kate Manganaro 1F

In order to calculate the theoretical yield, we would find the limiting reactant and base it off of that, but is there any way to calculate the actual yield of a chemical reaction or will it always be given to us?

Kate Manganaro 1F

Just for clarification, if a catalyst is present in a chemical reaction, it doesn't appear in the reactants or products of the chemical equation does it?

CHEMISTRY COMMUNITY

Search found 32 matches

Re: Protons are lewis acids?

ICl2- Shape

Re: H3O vs H2O

Re: Protons are lewis acids?

Re: Ka

Re: How To Know When A Molecule Will Be Bent?

Re: basics of hybridization

London Forces

Re: VSEPR confusion

Re: E

Re: Any Other Shapes?

Re: Test 3

Re: Where to put double bonds? [ENDORSED]

Re: Exceptions to the Octet

Equation

Re: Order of Dots

Re: Resonance Structures

Re: Frequency and Wavelength

Re: Switching 3d and 4s

Re: Decrease across a period

Re: Lobes [ENDORSED]

Re: 2.1 help [ENDORSED]

Orbitals as states

Re: Rydberg Formula

Re: Wavelength and De Broglie Equation [ENDORSED]

Re: Looking over discussion problems

Re: Photoelectric Effect

Re: How do I use Planck's constant? [ENDORSED]

Re: Planck's Constant

Avogadro's Number [ENDORSED]

Actual Yield [ENDORSED]

Catalysts [ENDORSED]