CHEMISTRY COMMUNITY

Rayna Irving 2C

Do we only use the ionization constant for water, Kw, when trying to find the concentration of [H30+] and [OH-] of strong acids/bases, or are there other uses for it?

Rayna Irving 2C

The R value we use just depends on what units the question gives, and I believe we will be given a list of all the possible R values and what units they correspond to on our equation sheet.

Rayna Irving 2C

When simplifying quadratic equations, which value of K signals that it is okay to do instead of the quadratic equation: 10^-3 or 10^-4?

Rayna Irving 2C

I usually just try to keep track of my posts myself because we don't know when exactly TA's will update chemistry community grades (weekly vs. all at once at the end) but you can keep checking on the grades tab in CCLE in the mean time.

Rayna Irving 2C

Just checking but is temperature the only thing that can change the value of K?

Rayna Irving 2C

Q and K are found the exact same way with the ratio of products/reactants, but K is just specifically referring to the value when the reaction reaches equilibrium.

Rayna Irving 2C

I'm pretty sure we use atm because its units line up with the R value we are given on the equation sheet so the units can cancel, but in the lecture he said that 1 atm is also pretty close to 1 bar if you're wondering.

Rayna Irving 2C

One thing that helped me a lot was studying consistently throughout the quarter instead of cramming all the info in my head right before finals and midterms, because it helped me feel a lot less overwhelmed and stressed in the long run.

Rayna Irving 2C

For me, doing textbook problems, going to UA sessions when I'm not completely sure about a topic we went over, and watching chemistry review Youtube videos are the three things that I found help me the most when studying.

Rayna Irving 2C

I'm pretty sure we don't start using them unless we take the higher level chemistry classes in the future.

Rayna Irving 2C

I usually just search studying or reading music on Spotify (and it's most likely on other streaming services too) and a lot of good playlists come up that help me stay focused.

Rayna Irving 2C

I mainly try to use the textbook when I'm unsure about a certain topic in lecture, because it often goes into more detail and nuance. I also like to use it for practice problems as a kind of benchmark to see if I am retaining and comprehending the information.

Rayna Irving 2C

Definitely textbook problems and UA worksheets for specific topics have been the most useful for me.

Rayna Irving 2C

I would definitely keep your notes and save the outline to your computer with it worked out while you still remember the info so you can look back later.

Rayna Irving 2C

Thank you so much and good luck you and everyone else, as well!

Rayna Irving 2C

This month as definitely been overwhelming so far with trying to review for all my classes at once, but I'm pushing through and very excited for break!

Rayna Irving 2C

I watched this video too and it really helped me fill in the gaps of what I didn't understand about coordination compounds! Thanks for spreading the word

Rayna Irving 2C

I was wondering if there was any place that specifically lists all the polydentate ligands we have to memorize for the final as well as the number of bonding sites there are?

Rayna Irving 2C

Mainly, I'm going to try to review as many textbook problems as I can and try to re-read the textbook sections we went over so I can pick up any small details I may have forgotten. I also plan to go to as many review sessions as I can, especially for the fundamental part because it's been a couple w...

Rayna Irving 2C

Yeah I'm not sure what's happening either. I tried logging out and logging back in several times and it still isn't letting me watch it.

Rayna Irving 2C

Textbook practice problems help me the most with studying, but I would also go to as many step-up sessions and workshops as possible because they always give great examples that help a lot with the tests. As far as equations I would just stick with anything that looks familiar on our formula sheet w...

Rayna Irving 2C

I feel kinda okay about the material so far, but I just wish the tests weren't so high-stake where missing a few questions could drop you a whole letter grade. While this is true, I do really appreciate all of the resources he provides us to solidify our knowledge on the material.

Rayna Irving 2C

Yes, just remember that each single, double, triple, etc. bond still only count as one region of electron density and each lone pair also only counts as one region of electron density.

Rayna Irving 2C

I usually take a few breaths during the test and plan out how much time I have for each question so I don't feel so rushed. I also make sure I've done practice problems before and stop studying at least 10 minutes before the test so I have time to get everything together and calm down.

Rayna Irving 2C

I'm definitely going to try to look through the book again as well as redoing the practice problems because some questions always seem to pop up on the test. I also am going to try to go to as many step up and review sessions as I can so I can get a stronger understanding of the material. I would al...

Rayna Irving 2C

Since the last holiday we had a lecture, I'm assuming this time will be no different but I don't think we're still having discussions.

Rayna Irving 2C

Yes I'm pretty sure it is cumulative having all the material from midterm 1 and 2 plus whatever new things we learn by the end of the quarter.

Rayna Irving 2C

I usually like to take a nap if I don't have anymore classes at the time and binge watch my favorite shows that I needed to catch up on. I suggest taking time to do whatever hobby you like while you have free time to do so before more tests and homework problems are due.

Rayna Irving 2C

Is it correct to make the assumption that hybridization of orbitals only happens in covalent bonds and not ionic bonds because, with ionic bonds the atoms don't share electrons, they take them, but in covalent bonds they do share electrons?

Rayna Irving 2C

I was wondering how do we know that triple bonds have two pi bonds and one sigma bond, rather than two sigma bonds and one pi bond?

Rayna Irving 2C

In order to find out how many hydrogen bonding sites there are, you first count how many hydrogens there are bonded to F, O, or N atom, and then count the lone pairs on an F, O, N atom and that's it or are there any other steps to go through?

Rayna Irving 2C

I'm not sure whether this midterm will be harder or easier than the last one, but I know there will be more questions worth less points and the questions will be more conceptual rather than math-based since we didn't really do much math besides formal charges since the last test.

Rayna Irving 2C

No, I don't think we're expected to calculate bond length as of right now, just know certain trends and ideas like triple bonds are the shortest while single bonds are the longest, and the bigger atoms have longer bond lengths when bonded with another, etc.

Rayna Irving 2C

I don't really understand how you decide if a molecule has ample ___ bond character or overwhelmingly ___ bond character. I know you have to compare the lewis structures, the observed bond lengths and the expected values together but I don't really know what I'm looking for to choose the right answer.

Rayna Irving 2C

It was mentioned briefly in the Wednesday lecture last week, but I didn't really understand why a molecule with high polarizability and dispersion force strength will most likely be a solid, while a molecule with low polarizability and therefore lower dispersion force strength would most likely be a...

Rayna Irving 2C

Single bonds are longer than triple bonds because there is only one shared electron so the force that brings the atoms closer together is weaker than in a triple bond.

Rayna Irving 2C

Yes because you have to take into account the number of bonded electrons an atom has in order to calculate the formal charge.

Rayna Irving 2C

To be honest, this week hasn't been going that great because I'm trying to study for multiple midterms, attend as many office hours as I can, finish writing an essay as well as stay up to date with all the lectures, homework, and labs so it's a lot to juggle. Hopefully it will all be worth it though...

Rayna Irving 2C

I was just wondering If there was any particular reason why oxygen can be drawn with 7 electrons (6 lone electrons and one shared) instead of 6 when drawing the Lewis Structure for NO3- even though I thought oxygen can't break the octet rule without a d-orbital?

Rayna Irving 2C

I was worried about this too but I found out that if it isn't a metric unit, then we will be given the conversion factors to help us figure out the answer.

Rayna Irving 2C

I think the issue might be in the accuracy of your answer. I just plugged it in and got 12373 as an answer. maybe this answer would work? Thank you so much! I plugged this answer in and got it right. I think my calculator wasn't accurate enough and that was the issue but thanks again! Can someone h...

Rayna Irving 2C

I agree with everyone here in saying in order to not have a rounding error ruin my answer I usually keep my work and numbers in my calculator and then look for sig figs in the final answer as my last step.

Rayna Irving 2C

AliAsh 1H wrote:I think the issue might be in the accuracy of your answer. I just plugged it in and got 12373 as an answer. maybe this answer would work?

Thank you so much! I plugged this answer in and got it right. I think my calculator wasn't accurate enough and that was the issue but thanks again!

Rayna Irving 2C

Just checking, when a Sapling problem asks how many spectral lines there are when an electron returns to a lower level from n=7 for example, is the answer 6 because a line appears between the drop from 7 to 6, 6 to 5, 5 to 4, etc. all the way to 1?

Rayna Irving 2C

Thanks for asking this, I saw it too and I wasn't sure exactly what it meant so these answers are very helpful!

Rayna Irving 2C

I agree with what was said, if you end up with a fraction in your empirical formula, multiply it by whatever number gets the fraction to a whole number. Then don't forget to multiply all of your other numbers in the empirical formula by that same value to make sure everything is equal.

Rayna Irving 2C

I've been having trouble with the sapling problem: The electron in a hydrogen atom is excited to the n=7 shell and emits electromagnetic radiation when returning to lower energy levels. Determine the wavelength range in nanometers when returning to lower levels. I got the lower range of 93 nm (which...

Rayna Irving 2C

Yes, because it has a measurable mass, even if it seems really small, therefore the equation is applicable here.

Rayna Irving 2C

I usually make sure I can do all of the homework problems up until now because sometimes I forget some of the concepts that we went over in the beginning of the year, and I also go to step-up and workshop sessions to ask any questions I have and get more practice.

Rayna Irving 2C

My TA also said that they had a meeting with Dr. Lavelle and decided that graphing calculators wouldn't give students any advantage over non-graphing calculators since we are given an equation sheet already, so they ruled that any type of calculator is fine for this midterm.

Rayna Irving 2C

I agree with everyone above, from what we have learned so far, c is always a constant used in equations to represent the speed of light.

Rayna Irving 2C

If the Lyman Series is ever mentioned in a problem should we just assume E(final) is 1?

Rayna Irving 2C

I suggest reading over the textbook and going to step-up sessions and any other office hours that fit your schedule so you can be with other people who might come up with questions that you might not have thought about on your own to enhance your comprehension of the material.

Rayna Irving 2C

Usually, I use the same amount of sig figs in my answer as the number with the least amount in the problem. If the tests happen to be multiple choice, however, I don't know how much making an error in this process would affect our grade, but I would stick to this method just to be safe.

Rayna Irving 2C

I was wondering if there was a clear cut off of what wavelength is officially too small to be measured or should we just stick with the idea that anything smaller than around a picometer to 10^15 is too small, like discussed in the de Broglie module video?

Rayna Irving 2C

In general, when a question gives you the frequency in Hz of the light a hydrogen atom emits and the energy level the light reaches, how do you find what principle quantum level it started at? (Question #42 on this module)

Rayna Irving 2C

When considering significant figures in a number, is the (10^x) part also included when using scientific notation or does that part not count?

Rayna Irving 2C

I agree with all of the previous posts in saying that while it probably isn't required it does help me a lot to keep track of my work and make sure I'm not missing or confusing any units. At the very least I believe it can possibly open up the opportunity for partial credit even if your final answer...

Rayna Irving 2C

The way I usually do it is I copy exactly what is written on the periodic table when calculating molar mass and wait to deal with significant figures until I get my final answer for the problem. Usually what I've found is that any rounding errors are so small they're insignificant and don't really a...

Rayna Irving 2C

Yes, because without knowing the limiting reactant, we cannot get a full grasp on how much a theoretical experiment would make because the limiting reagent both directly limits and determines the amount of product produced.

Rayna Irving 2C

In addition to precision and accuracy, significant figures also a way to make sure that the results we report are both honest and relevant to the problem. Also, because everyone may round differently resulting in multiple varying final answers, sig figs are needed so we can get a general consensus o...

Rayna Irving 2C

In a multi-step question, I was wondering if it is better to round your sig figs after each step, or to just wait until the end when you get your final answer?

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