CHEMISTRY COMMUNITY

Matia Kim 1B

Do we need to include the power in front of the hybridization? *C2sp2?

Matia Kim 1B

For the final, will we need to specify which bent shape we are referring to when answering? Would including the angle be enough?

Matia Kim 1B

What are the electronegativity trend exceptions? What is the general trend?

Matia Kim 1B

What are the exceptions in regards to the electronegativity pattern regarding the periodic table? Will we need to know these exceptions for the final?

Matia Kim 1B

Depending on the electronegativity of the atoms or molecules, it should be a good indicator that it is nonpolar.

Matia Kim 1B

Does a triple bond have 1 sigma bond and two pi bonds? Or is it 2 sigma bonds or something totally different?

Matia Kim 1B

In class today he said "number of unpaired electrons tells you how many...." can somebody finish this for me? I couldn't get if he said bonds or something else. Thank you

Matia Kim 1B

In class today he labeled methane (CH4) as C2sp^3 H1s. Why is it not 2sp^4 if there are four regions of electron density?

Matia Kim 1B

In class today, Dr. Lavelle said that hybridization does not tell us molecular shape/structure, but can it tell us bond angles?

Matia Kim 1B

Because we only write it out as SP2 instead of 2SP2, does that mean energy levels has no relation with hybridization? Would energy levels be needed if we were to go beyond 3 bonds?

Matia Kim 1B

Why is the first bond always going to be Sigma? and the second and third Pi? can there be more than 3?

Matia Kim 1B

Is there a difference between trigonal planar and trigonal pyramidal compounds? Is there a difference in their bond angles?

Matia Kim 1B

What does it mean if an element is more electronegative than another?

Matia Kim 1B

With elements with exceptions in their classification like Copper and Chromium, does that change the number of valence electrons they produce?

Matia Kim 1B

In terms of drawing Lewis Structures, how does dipole moments effects the structure of an atom?

Matia Kim 1B

How do you know which resonance structure to use if they are polar? Is it always by lowest charge?

Matia Kim 1B

Why are these two given exceptions for the Octet rule? Is it only these two?

Matia Kim 1B

Can we determine an element/compound by formal charge alone?

Matia Kim 1B

How do you know if the charge is positive 1/2 or negative 1/2?

Matia Kim 1B

Why does the number order change going from S to D? 4s to 3d instead of 4d?

Matia Kim 1B

What's the difference between the outer most orbital and shell? Is the shell now the outer most orbital?

Matia Kim 1B

Can someone explain to me how orbitals work? Why it starts with s but skips p and d for f? I am lost with this. Thanks!

Matia Kim 1B

To what extent are Black Bodies relevant in our everyday lives? Is this something that can only occur through manipulation or naturally?

Matia Kim 1B

In terms of given variables (e.g. speed of light), how many significant figures is recommended to answer a problem?

Matia Kim 1B

The photoelectric effect was an "accidental finding", what was the original purpose of the study? Did they ever follow up on that purpose?

Matia Kim 1B

I personally refer to Khan Academy when I struggle with chemistry related topics. And crash course is always available on YouTube if you haven't checked.

Matia Kim 1B

I personally have never heard of the term workforce in chemistry so I looked it up myself and didn't really find anything relating to chemistry. I would assume it is just the same as work function. But if anybody else knows otherwise that would be great too.

Matia Kim 1B

I've been struggling to figure out if a question is asking for a dilutions solutions or convergence solution. I know you need 3 givens to answer a dilutions but some questions have you figure out the third solution. What should I be looking for to know whether if the question is asking for a dilutio...

Matia Kim 1B

I don't recall us going over chemical structures too in depth in class, or if we even did that in class yet. I wouldn't focus on that but instead focus on the lecture and stuff from our readings. Hope that this helps!

Matia Kim 1B

Hi I am not a student that has accommodation on section tests but I would highly recommend reaching out to Dr. Lavelle and your TA in person as well as shooting an email if you haven't done so. Goodluck!

Matia Kim 1B

Can you split weak acids or bases? If so how? If not, why not?

Matia Kim 1B

How does ph levels of acid rain differ around the globe?

Matia Kim 1B

Can acids and bases neutralize each other, and if so how? Is it just by mixing solutions?

Matia Kim 1B

What do the strength of acids and base tell us and what is the relationship of acidity to a molecular structure?

Matia Kim 1B

Why is an acid and base about the donor and acceptor of protons whereas Lewis acids and base is about the donor and acceptor of electron pairs?

Matia Kim 1B

I'm trying to know what the significance of these are, so what do a coordination sphere, number, and compound tell us?

Matia Kim 1B

Can someone explain to me the valence bond theory? or link me to a video that better explains it? I couldn't understand it from what the author said about it in the text.

Matia Kim 1B

Is it possible to determine a molecule's shape using VSPER with a radical molecule?

Matia Kim 1B

What is the difference between hybrid orbitals and regular (nonhybrid) orbitals?

Matia Kim 1B

Are radical chemical bonds possible without an extra electron to make the number of electrons even? Do they exist without manipulation?

Matia Kim 1B

A chemical bond with 4 or more elements, do they always bond with one specific atom (one directly in the middle) or can they be two pairs of elements sharing a bond? (kind of difficult to word)

Matia Kim 1B

How do you know if a bond will have an octet exception or not? Is it only by memorization or position of an element on the periodic table?

Matia Kim 1B

Why is it that elements in the third row and below have octect exceptions instead of elements earlier in the periodic table?

Matia Kim 1B

What is the easiest way to distinguish the three different kinds of bonds?

Matia Kim 1B

How do you know if a bond is sharing electrons or not?

Matia Kim 1B

The textbook says that electron affinity increases towards the right of the periodic table. Why is that? Also is there a pattern or affinity going down the groups of the periodic table?

Matia Kim 1B

The textbook says that a(sub 0) is called the Bohr radius. Is this number a constant and what is its value? If not how do you find it?

Matia Kim 1B

In lecture today he said that lower ionization energy levels are cations. What is considered a low ionization energy? is it by value or position of the periodic table?

Matia Kim 1B

In the caption of the "Particle in a Box" the equation is showed as (n^2*h^2)/(8mL^2). What does that mean and what does the other equation in the textbook (2n+1)(h^2)/8mL^2 mean?

Matia Kim 1B

The purpose of this equation is to find both the wavefunction (phi) and the corresponding energy (E). This equation helps us calculate the wavefunction for any particle. The textbook also mentions that this equation is a differential equation, the second derivative of phi, because it relates the der...

Matia Kim 1B

I am not 100% sure but from the success that I had with these kinds of problems when the values of n aren't given, it would depend on what is given. Assuming that everything but n is given, you would simplify it to 1/n(1)^2 - 1/n(2)^2 = Given info (after simplifying). From here you kind of have to g...

Matia Kim 1B

How do you know if a black body is emitting or absorbing a particular wavelength? And is black body radiation only the process of emitting different radiation wavelengths?

Matia Kim 1B

The textbook explains black body as the "hot object" and basically means that it is an object that is extremely hot (so hot it glows white) because it doesn't favor one wavelength over another, in the sense of choosing a wavelength to absorb or emit.

Matia Kim 1B

What is the significance of this value and is this only applied to H-atoms?

Matia Kim 1B

In the photoelectric effect slides learned in class, it talks about the concept of a radiation source emitting electrons off a source of metal. Does the kind of metal have any effect on this at all? Or does metal have a consistent value in this relationship between radiation, metal, and emitting ele...

Matia Kim 1B

I know that infrared radiation is radiation experienced as heat but do other radiation like visible light have a similar effect by heat?

Matia Kim 1B

I know that Planck's Constant is 6.626 x 10^-34 J S but what's the significance of it and when do you use it?

Matia Kim 1B

I am still confused on the idea of how Avogadro's number is consistent with every element. It doesn't make sense to me how an element as light as Hydrogen has the same number as a metal like Silver. Also I am unsure as to why Avogadro's number is a constant in chemistry with all of the other element...

Matia Kim 1B

I understand the law of conservation of mass how matter is neither created nor destroyed. But If you were to dissolve a solution in a substance and boil the substance, would that effect the weight of the substance? Or would it depend on the chemistry of the substance?

Matia Kim 1B

I've seen different forms of the word moles used in the text, homework, and lecture slides and confused as to which term to use when, if it matters. Does it matter which spelling of the word I use (other than adding the "s" for plural).

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