CHEMISTRY COMMUNITY

Kendra Barreras 3E

Another example would also be plumbate for lead.

Kendra Barreras 3E

Recall that hydrogen bonds can form when a hydrogen that is bonded to a Nitrogen, Oxygen, or Fluorine is strongly attracted to a Nitrogen, Oxygen, or Fluorine with a lone pair. In problems where it asks you to find how many hydrogen bonding sites there are, you should look for the hydrogens bonded ...

Kendra Barreras 3E

I really doubt that the exam will be on topics that we haven't yet tested on. It will most likely be an equal distribution of topics from before the midterm and after the midterm. I'm assuming that the exam will be hard, not because of the content, but the combination of different concepts. Or bett...

Kendra Barreras 3E

I know the exam is cumulative but I would also assume that material from post-midterm would be more heavily emphasized.

Kendra Barreras 3E

Thank you!

Kendra Barreras 3E

I'm also wondering the same thing^^^^

Kendra Barreras 3E

It is cumulative and regarding the outlines, just make sure to understand conceptually the topics discussed in each and how they form connections with each other.

Kendra Barreras 3E

It is cumulative but I would suppose that more material after the midterm would be emphasized.

Kendra Barreras 3E

How many posts should we have by then?

Kendra Barreras 3E

Dr. Lavelle's syllabus says that you need at least a 50% to get a passing grade in the class.

Kendra Barreras 3E

It'd also be a good idea to look at the outlines he has. All the topics are listed there.

Kendra Barreras 3E

Without myoglobin, is hemoglobin square planer about Fe? Isn't hemoglobin just 4 myoglobin-like molecules joined together? It should have the same shape I believe? Yea! Myoglobin is a cytoplasmic protein that binds oxygen on a heme group. It harbors only one heme group, whereas hemoglobin has four.

Kendra Barreras 3E

VioletKo3F wrote:Does anyone know if there's discussion on Wednesday?

Lavelle sent out an email explaining how if discussions were Wednesday after 3pm then they were going to be canceled.

Kendra Barreras 3E

Yea! Basically everything that we have learned in lecture is fair game for the final.

Kendra Barreras 3E

Haley Pham 4I wrote:Bronsted acids are are proton donors, while Lewis acids are electron acceptors. All Bronsted acids are Lewis acids, but not all Lewis acids are Bronsted acids.

Similarily all Bronsted bases are Lewis bases but not all Lewis bases are Bronsted bases.

Kendra Barreras 3E

Using the correct number of sig figs could never hurt but I would assume that if you don't the loss of points would be minimal.

Kendra Barreras 3E

Jamie Hwang 3H wrote:Does anyone know if the final will be cumulative of everything we have done this quarter or is it just stuff we learn after the midterm?

It's a cumulative 3 hour final on Sunday, December 8th.

Kendra Barreras 3E

I'd personally focus on the material after the midterm that I least understand in order to understand it more for test #2.

Kendra Barreras 3E

SO2 has a region of unequal sharing, in which when you draw the VESPR model of it, you see that where the lone pairs are there is a bent shape that is less electronegative. Therefore, the oxygens at the bottom are more negative making SO2 a polar molecule.

Kendra Barreras 3E

I believe Lavelle said in lecture on Friday that hybridization wouldn't be on the test.

Kendra Barreras 3E

Lone pairs cause repulsion and this in turn changes the geometrical arrangement.

Kendra Barreras 3E

I believe the next test happening on week 8 will have everything from the second part of 2d to the information we get to right before the next test.

Kendra Barreras 3E

In general, for electronegativity just remember that Fluorine is the most electronegative and from there it decreases down and to the left from there.

Kendra Barreras 3E

It is important to know the trends going across the table however, I don't think he will ever ask a question regarding specific personalized numbers to an atom.

Kendra Barreras 3E

Does anyone have any advice on how to take really good notes during lecture? I usually copy the slides but I always feel like he says some important things, I just never catch them on time since I'm too busying copying what the slides say The first few weeks I would focus too much on taking notes a...

Kendra Barreras 3E

As for the trend just remember that Fluorine is the most electronegative atom and therefore it decreases going down and to the left.

Kendra Barreras 3E

Usually the question will be specific regarding what it wants, but my TA said that unless it states to do the FULL electron configuration to just do the notation using the noble gas.

Kendra Barreras 3E

Electron affinity is the amount of energy released when an electron is added to the neutral atom, mean while electronegativity is the tendency of an atom to attract an electron towards it.

Kendra Barreras 3E

So for the 2nd test there will only be material from after the midterm?

Kendra Barreras 3E

I would say stay on campus as long as possible and really take advantage of the breaks between your classes. Although review sessions do help, they aren't mandatory to be successful in the class and as long as you understand the information conceptually and practice homework/additional problems you ...

Kendra Barreras 3E

What was the average for test #1?

Kendra Barreras 3E

Both electronegativity and ionization energy increases from left to right. The same is true for electron affinity. the opposite however is true for the atomic radius.

Kendra Barreras 3E

The electronegativity trend increases from left to right and from bottom up. Therefore the order would be indium, tin, antimony, and finally selenium. (increasing as you go from left to right)

Kendra Barreras 3E

Yes because what comes before it is 3d10 and because 4s2 is in n=4 you remove from t first.

Kendra Barreras 3E

It typically is the one with the lowest ionization energy.

Kendra Barreras 3E

5s comes before, but don't worry too much about the f-block since Dr. Lavelle stated in lecture that we wouldn't really be dealing with it.

Kendra Barreras 3E

I think it would definitely be helpful to know the difference and in which categories the Lyman and Balmer series fall on. Also, there is a homework question that asks to order wavelengths in order of energy (or might be length), in any case maybe know the general order.

Kendra Barreras 3E

It can only work for Hydrogen, or other one electron systems because the Rydberg formula is used to predict the wavelength of light that results from a single electron moving between an atom's energy levels.

Kendra Barreras 3E

Both are used together to find the correct ground state electron configuration. The Pauli Exclusion principle just tells you that in one individual level your electron direction has to be opposite of each other (have different spins). Hund's says you have to fill up every level before attempting to ...

Kendra Barreras 3E

Dr. Lavelle said in lecture that it wasn't necessary to know how to derive it for this class.

Kendra Barreras 3E

The principal quantum number, n, determines the energy level of the electron in an atom. There are n^2 orbitals for each energy level.

Kendra Barreras 3E

I dont think it should be as long as your final answer is not more sig figs than the least digit you used.

Kendra Barreras 3E

I was wondering the same thing, if I had to take a guess I would say sometime in your specific upcoming discussion days.

Kendra Barreras 3E

Thank you so much for the advice!

Kendra Barreras 3E

For my understanding as well, there is an infinte number of energy levels but you must remember that they are always integers.

Kendra Barreras 3E

There is a periodic table on Lavelle's website and also for future reference it is in black and white just like it was in the first test.

Kendra Barreras 3E

It basically is just telling you that there are 3 sig figs and given that that is your least number of sig figs in the problem, that amount would be the one you would use for your answer.

Kendra Barreras 3E

It's important to balance chemical equations because aside from the Law of Conservation of Mass where matter can not be created nor destroyed, you need to have the correct molar ratio in order to be able to conduct any sort of stoichiometric problem.

Kendra Barreras 3E

Personally Lavelle's modules help out a lot and also what has helped me with topics I struggle with is to google problems aside from the book and see if I find a way that makes more sense to me. Thanks to eeryone for the tips!

Kendra Barreras 3E

The zeroes before a non zero number never count (ie 0.0005 has 1 sigfig) The zeroes after a non zero count because they are telling you that you are sure of that digit until that last zero (ie 12.2300 has 6sf) because a sig fig is all the digits that you are sure of plus the one you are unsure of, t...

Kendra Barreras 3E

Not necessarily, you first would have to see which ratio you need using your balanced chemical equation and then convert the grams you were given into moles and see if it fits the ratio, you have. If it does not you have to check if it either has more or less than you need and evaluate from there.

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