CHEMISTRY COMMUNITY

Summer_Corona 3L

Veronica Macias 3K wrote:I was also wondering the same thing. I am hoping they will open more seats because it seems like a lot of people were not able to enroll.

I believe someone emailed the professor or department and they said they don't plan to open any more seats.

Summer_Corona 3L

I usually try to just keep myself busy so that I don't think about it. If I'm not doing any work then I'll watch some of my favorite shows or look at social media.

Summer_Corona 3L

It's just 50 by the end of the quarter. I've gotten points for extra posts I did during a week.

Summer_Corona 3L

Yes, congrats everyone!! We're almost done with this quarter so finish strong!

Summer_Corona 3L

As many have said I recommend going to the step-up sessions, especially since last quarter for 14a they actually divided their sessions up into certain sections so you could go to ones about topics you may be struggling with or have forgotten. Going over the textbook problems is also your best bet a...

Summer_Corona 3L

A UA had told me it's 0 degrees Celsius.

Summer_Corona 3L

Yes, there is an error on the solutions sheet. If you look at the solutions errors pdf on the chem site you'll see that your answer 2.7kJ is correct and the decimal is missing on the solutions pdf. Edit: I just noticed you wrote 5G13 and if you actually meant 5G15 then my answer still stands but if ...

Summer_Corona 3L

The 101.325 is to convert L.atm (which are the units you get from multiplying pressure and delta V) into Joules since 1L.atm=101.325J. We do this because we like to have our units for work in J. You can find this conversion on the constants sheet and I don't think lavelle actually mentioned this in ...

Summer_Corona 3L

From what I gathered it's because a monoatomic gas means that it will have more space to move around and thus more disorder. While a diatomic gas has more restriction on movement compared to a monatomic one and in turn less disorder.

Summer_Corona 3L

For part a in order to determine if work is done on the system or by the system you need to see if work is a positive or negative number. This can be done without doing any actual math because we are given deltaU (982) and q (492). Because delta U is greater than q and is found with the sum of q and...

Summer_Corona 3L

For this question we know that 765J of heat is being transferred therefore q=765J (and so does delta H like you said). With that in mind we can use the equation q=nCdeltaT to find the final temp. For constant pressure you would set it up as .820*5/2*R(T(final)-298K)=765. The 5/2*R is coming from the...

Summer_Corona 3L

I think your issue may be for the last step your T2 should be the temperature that the water started at before reaching its boiling point (for example mines was 56 degrees Celsius) and your T1 should be the boiling temp.

Summer_Corona 3L

Although there won't be any TA office hours, Lavelle sent out an email about UA sessions happening tomorrow and Monday at these times.

Sunday: 8-10am (step-up) and 7-9pm (step-up)
Monday: 12-1pm (drop-in) and 1-2 (drop-in)

Summer_Corona 3L

I definitely recommend going to the UA sessions, especially the step-ups if you have some loose ends of understanding on certain topics. However, if you do understand the concepts it's just when you get to the test you feel as if you don't know what to do then that is test anxiety. In order to help ...

Summer_Corona 3L

As the others have said, outline 5 will not be on the midterm and it will be the remainder of outline 3 and outline 4.

Summer_Corona 3L

I'm nervous as well. I've been going to more UA sessions than I did for the last midterm so I'm hoping that will help me do better along with doing the txtbook problems.

Summer_Corona 3L

I sometimes have this problem as well. The best thing you can really do is check your work. I even write down whatever I will be inputting into the calculator on scratch paper so that as I type it onto the calculator I can reference it and make sure I entered it correctly.

Summer_Corona 3L

Yes, you would use the grams of ice to find the moles then multiply that by $\Delta H$

Summer_Corona 3L

For strong acids I use SO I Brought NO Clean Clothes. I don't know one for bases but Lavelle had said if the cation is from groups one or two then it's strong.

SO- HSO4
I- HI
Brought- HBr
NO-HNO3
Clean- HCl
Clothes- HClO3 or HClO4

Summer_Corona 3L

I'm pretty sure in lecture Lavelle said we use w to represent work

Summer_Corona 3L

I definitely understand how you feel, lately I have not had much motivation for school. What I usually do to get over the mood is try to get some form of studying done, even if it's only for twenty minutes. From there, I usually take a break to do something to bring my spirits up and see if I'm up t...

Summer_Corona 3L

Yes, the link to download respondus is on ccle at the bottom of the page where you would find the link to chemistry community. As the person above stated, once you download it it will start up automatically when you start the midterm.

Summer_Corona 3L

Week 1 - 3!! I'm scared! Is anyone else scared? I'm definitely nervous and ready to just get it over with lol. No same tho! I paid my tuition a day after the deadline and got kicked outta all my classes last week :( I finally just got caught up with Chemistry! Oh wow I'm sorry to hear that. I hope ...

Summer_Corona 3L

Yes, you would still get credit since they don't ask us to turn in our work.

Summer_Corona 3L

I would say it depends on how much practice/clarification you want on the relevant topics that week. Most of the sessions seems to revolve around similar topics, you just get to see new practice problems. If you seem pretty confident in the material and don't want to do too many practice problems, t...

Summer_Corona 3L

Hey, does anyone know about any of the UAs planning to use their sessions to review things before the midterm this week.

Summer_Corona 3L

Charlie Russell 2L wrote:Week 1 - 3!!

I'm scared! Is anyone else scared?

I'm definitely nervous and ready to just get it over with lol.

Summer_Corona 3L

You can find the testing schedule on the chem website. According to the syllabus, the midterms will be 50 minutes. Also you do need respondus in order to take the exam. As far as I'm concerned there will be no short answer questions on the exam. Lastly, because our tests are proctored we will be in ...

Summer_Corona 3L

Heather Costa 2C wrote:will we be in a zoom meeting with our TAs during the midterm?

Yes, the TAs will be proctoring us during the midterm. I'm not sure if they will use the links from our sections or will provide us a new one though.

Summer_Corona 3L

I'm also in 3L and I'm assuming we will still have section since our TA hasn't said otherwise, maybe they will use it as time to ask last minute questions.

Summer_Corona 3L

As the others have said, the best way to study is going over the textbook problems a few times and attending as many UA sessions you can (I try not to overdo it though as it causes me to burnout). I also look at the homework problems that I may have had trouble solving on my first try and attempt th...

Summer_Corona 3L

Week two homework is due this upcoming Sunday, week one homework was the one due last week. Lavelle normally puts the week the homework is due in parenthesis after the title so for example the one that's due this Sunday says "Week 2 Assignment (due midnight Sunday week 3)".

Summer_Corona 3L

Yes, for this question I assumed that the initial concentrations of the reactants was 0 and that their change would be +x while the product's change would be (initial-x). Meaning your equation should look like (product initial-x)/x^2 = Kp. From there, you just solve it like any other question using ...

Summer_Corona 3L

So for question 3 you would first start off by cross multiplying which will give you 2x^2=53.5(.500-x)^2. Then your next step would be to I guess you could say solve 53.5(.500-x)^2 and that gives you 53.5x^2-53.5x+.25=2x^2. From here set the equation to zero and plug it into the quadratic formula to...

Summer_Corona 3L

If this has only happened when you clicked someone else's post, then I think it just mean that person posted in the wrong forum on accident. I don't think this is a issue on your side because this post alone was posted in 14B, but if it is I don't know how to fix it. If you're worried about your gra...

Summer_Corona 3L

Q and K don't represent the same number. K is a constant that stays the same (unless you change the temp) and shows you the ratio of the concentration of products over the concentration of reactants. Q actually can help you determine if a reaction is at equilibrium and if it isn't how it will shift ...

Summer_Corona 3L

A tip to help you memorize strong acids is the phrase: SO I Brought NO Clean Clothes

SO- HSO4
I- HI
Brought- HBr
NO- HNO3
Clean- HCl
Clothes- HClO3/HClO4

I don't really know any for the bases but if the cation is within groups one or two then it is a strong base.

Summer_Corona 3L

The grading is just based on quantity as long as you have posted 50 times by week ten you’ll get all your points.

Summer_Corona 3L

I know it’s a kid’s movies and I haven’t watched it in a while but I’ll probably never turn down watching Rio lol. Although, I usually listen to music if I just want background noise as I work.

Summer_Corona 3L

Yes, I think everything will be the same the only difference is that the midterms will be during lecture instead of section.

Summer_Corona 3L

As the others have said, you can really post anything as long as you post it in the right section you're fine (there's even a section to post chem jokes)

Summer_Corona 3L

As some of the others have said I've learned it's best to spread out my studying since when I study too late I forget things easier. The textbook problems and going to the UA sessions seem to be the best way to test your understanding of the topics and if possible studying with others in the class i...

Summer_Corona 3L

Yes, hard water is alkaline and soft water is acidic. I think soft water is the one that feels soapy/smoother, but I am not entirely sure.

Summer_Corona 3L

They're on the class website under a link that says "Final Zoom Review".

Summer_Corona 3L

What I learned in the UA sessions was to look at the anion and cation separately and compare the conjugate bases/acids. For example if you have KCl you know that K comes from the strong base KOH and has a weak conjugate acid. While Cl comes from the strong acid HCl and in turn has a weak conjugate b...

Summer_Corona 3L

You solve it by finding 10^-pH. For your problem it would be whatever 10^-11.66 equals. This is the same with pOH.

Summer_Corona 3L

When you're asked for the conjugate acid you would write the original compound but with an extra H atom. So in this case it would be H2SO4.

Summer_Corona 3L

For this question the rule is that if the pH is greater than the pKa then the predominant species (anion) will be charged . On the other hand, if it is less than the pKa then the predominant species (acid) be neutral.

Summer_Corona 3L

Yeah dealing with test anxiety is hard. However, I've learned that studying too much causes me to tire myself out mentally more and I now try to balance between relaxing and studying. Also just doing things for self-care, such as eating enough everyday; having a moment to yourself to do what you enj...

Summer_Corona 3L

I think this may have just been a mistake on Lavelle's part and to just go with hard water being alkaline and soft water is acidic.

Summer_Corona 3L

For strong acids a good way to memorize it is using: SO I Brought NO Clean Clothes.

SO= HSO4
I=HI
Brought=HBr
NO=HNO3
Clean=HCl
Clothes=HClO3/4

As for the strong bases, I just would look to see if the cation is from groups one or two, if not then it isn't strong.

Summer_Corona 3L

As the previous person stated, I think for the final it's best to just know the strong acids we were given and based on Lavelle's last lecture it seems we will learn other ways to determine strength in 14b.

Summer_Corona 3L

After looking at your answer the only one you seem to have wrong is [Co(SO4)(NH3)5]. You placed it in box two but I think what you're missing is that there are five NH3 molecules and one SO4, therefore, the coordination number would be 6

Summer_Corona 3L

I'm finally caught up on lectures so that's good but I'm a bit anxious about the final since I need some clarification on some topics.

Summer_Corona 3L

Izamary Marquez 2L wrote:In addition to this question, do the formal charges change significantly when there is a delocalized bond? Or would it generally be the same?

I think it would depend on the molecule how greatly the formal charge is affected once you move the bond.

Summer_Corona 3L

I believe it's referring to the total 500 points.

Summer_Corona 3L

Hi, does anyone know if we will be able to print and use the ligand worksheet on the final or will we only be able to use the periodic table and equations worksheet like on the midterms.

Summer_Corona 3L

In addition to what the others have said, if the problem you're considering giving up has different parts where you were right on some of them, then I believe you can still earn the partial credit for what you had right. I may be wrong but I'm pretty sure that's what the warning said when I consider...

Summer_Corona 3L

Yeah, so far this class hasn't been as bad considering how much I hated chemistry in high school (and still kind of do). I do think I could probably do better if I had more time to do extra studying/practice, but I'm doing as much as my schedule will permit.

Summer_Corona 3L

What show do Cesium and Iodine love to watch together?
CsI

(I hope no one has recently posted this joke)

Summer_Corona 3L

I'm probably going to start studying later this week. I'm going to be studying by practicing the textbook problems, going to the step-up sessions, and as the final gets closer I'll try to study with some people.

Summer_Corona 3L

oh this is pretty cool. if I could I'd trust neither lol but for the sake of the choices I'll give green a chance

Summer_Corona 3L

By this Sunday you should have 35 posts.

Summer_Corona 3L

As the previous person stated, you are mixing the two. However, a larger molecule, especially one that is rod-shaped, is able to have a stronger LDF than a smaller molecule. The reason for this is because the larger molecule has a larger surface area and can allow for more LDF to occur compared to t...

Summer_Corona 3L

Yeah I thought that at first too but I remember in one of the UA sessions they said that Carbon and Hydrogen have a small difference in electronegativity (I think it was like .35). In addition to this, in CH4 carbon needs 4 electrons to fill its octet and gets it from the hydrogens while each hydrog...

Summer_Corona 3L

Yes, LDF are found in all molecules as fluctuating electron density is what's causing them to occur.

Summer_Corona 3L

They just added more spots to the lectures so once your second pass starts if you have a good time you should be able to get in. In general though once a class has all the waitlisted seats taken and the professor doesn't intend to add more then you will not be able to take it.

Summer_Corona 3L

Orla Lynagh-Shannon 1J wrote:Does anyone happen to have the groupme join link for this class? I would also be interested in joining a smaller study group.

Here's the groupme link for this class https://groupme.com/join_group/62288203/dSSkobMS

Summer_Corona 3L

I remember in lecture that Lavelle said dispersion interactions are always present/occurring because of electron density fluctuating which causes fluctuating induced dipole- induced dipole moments.

Summer_Corona 3L

From what I understand elements with d orbitals does start at the fourth period, however, when writing electron configurations it first appears as 3d then 4d and so on. This is why As has 3d^10 because it appears at the 4th period.

Summer_Corona 3L

Hey, does anyone have an official answer on posts being able to roll over to another week. I seen different answers on groupme where people said as long as you have 50 posts by week ten you get all the points while others have said you can only post 5 times a week and if you miss a week you can't ea...

Summer_Corona 3L

Yes I believe the midterm stops at Wednesday's lecture.

Summer_Corona 3L

It's graded weekly and it's one point for every post with five being the max you can get in a week. Meaning you can get a total of 50 points.

Summer_Corona 3L

In the converse manner, are all ionic bonds salts too? Or is it only one sided I'm not entirely sure but based off of what Lavelle concluded with in Friday's lecture, I would say it depends on the compound. Lavelle had mentioned that as the size of the anion increases in silver halides, they become...

Summer_Corona 3L

Yeah I didn't do as well as I'd liked on the midterm. However, what I normally always do after I'm done with a test is just tell myself that it's over and I need to accept whatever score I get because I can't change it. I usually get really nervous during tests and that causes me to make dumb mistak...

Summer_Corona 3L

I think the first thing you should do if possible is to not study somewhere where you're too comfortable. If you tend to study in your bed or just room in general, I would suggest moving to some place different. I also would suggest making a schedule where you have free time after studying so that y...

Summer_Corona 3L

Hey could someone explain how to create the Lewis structures for sapling. I did one problem but when I tried to repeat the same steps for the next one nothing happened. Thanks!

Summer_Corona 3L

Your TA checks you have 5 posts per week, so as long as you complete them before midnight every Sunday you should be fine! So it has to be before Sunday? Ahhh.. I consider Sunday as the last day of the week and completely forgot... :( I think you can still post on Sunday as long as you have all fiv...

Summer_Corona 3L

I believe he said that partial credit for this test will be given on some questions as some answer choices show how close you were to correctly solving the question. As the others have said, I don't believe that he curves his tests much if at all.

Summer_Corona 3L

For this question the answer is 0. In order to find the ml you first need to determine l and in this case it is zero because it is a s orbital. From there, the possible values for ml are values between -l and l but because for this problem l is zero then ml can only be zero.

Summer_Corona 3L

From what I understand ml represents the different orbitals within a subshell and the orientation of angular momentum. To find the values of ml using l you would just include all numbers from -l to l For example if l=3, then ml could range from -l to l so the corresponding values would be -3,-2,-1,0...

Summer_Corona 3L

If we are going from the excited state to the ground state, then the excited electron configuration will be given and your first step would be to look to see how many electrons are present (this is determined by adding the exponents). From there you would look on the periodic table to find the corre...

Summer_Corona 3L

Yeah it can be a little confusing at first glance but I just try to reread the problem to be sure I know what is being asked and then determine what the v represents. Just remember in problems using De Broglie's equation the v represents velocity and if another equation like E=hv or c=lambda*v is us...

Summer_Corona 3L

Sandra Kim 2B wrote:We're going to be allowed to have multiple empty sheets of paper for scratch work, right? I feel like just one wouldn't suffice for me :(

I believe so my TA said that as long as we show that our scratch paper is blank before the test starts we can have as many as we think we'll need.

Summer_Corona 3L

Hey again! So when you solve using the equation (solving for the energy of the initial and the energy of the final state and subtracting it) that usually gives you a negative energy, which represent the CHANGE in energy of the ELECTRON after going from the initial state to the final state. Because ...

Summer_Corona 3L

I usually listen to music that's not too fast/hype or just watch shows that make me laugh. A nap is always good too so you can just reset or even taking a break to eat something.

Summer_Corona 3L

The question is: What quantum numbers specify these subshells? 6s
n=? ℓ=?

Can someone tell me what the ℓ symbol is supposed to represent in this problem.

Summer_Corona 3L

If H2O is the formula for water, what is the formula for ice?

H2O cubed.

Summer_Corona 3L

I'm interested in joining too. Are you going to make a group on groupme or instagram? I think groupme would be the easiest but either works for me.

Summer_Corona 3L

I believe the electron can still be ejected. I have in my notes from lecture that as long as the energy of the photon is greater than or equal to the work function, then the electron will be emitted.

Summer_Corona 3L

So is the shorter the wavelength -> the higher the frequency-> the higher the energy? Or am I misunderstanding ? Yes, that is correct since shorter wavelengths mean more cycles or greater frequency and the frequency is used to determine energy with the equation E=hv. Where h=6.63x10^-34 and v is th...

Summer_Corona 3L

Divide the total energy by the work function to see how many electrons the energy can displace. 6.78×10−7 J/4.28494×10−19 J/photon Important concepts: One photon with enough energy to displace an electron will only displace one electron. In other words, there is a one-photon to one electron ratio i...

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