CHEMISTRY COMMUNITY

Namratha Gujje

I honestly suck at making time for myself and relaxing when I have a lot of things on my plate. What I usually try to do is give myself the nights off. I will work all day, but then stop working around 7ish and use the rest of the day to do things that make me happy. Since it's quarantine that usual...

Namratha Gujje

I am currently a freshman and I am really looking forward to going to all of the UCLA social events, meeting new people and creating strong friendships. I really miss going places with my friends and LA is going to super fun to explore with good friends.

Namratha Gujje

I am taking Cluster 20C Seminar, Life Science 7B, Life Science 30B and I am still debating if I should take Chemistry 14BL. It depends on how I feel after the first or second week of spring quarter.

Namratha Gujje

I have been doing alright. I definitely have been feeling unmotivated and I am hoping that having a relaxing spring will help me feel better and more prepared for the spring quarter. I hope everyone has a fun and safe spring break. Good Luck to everyone in their final!

Namratha Gujje

The equation that you should be using for this problem after its been rearranged should be Ea = -RT*ln(k/a) k = 0.258 A = 4.93×10^11 make that the R is in kj when you calculate, it should 0.0083145 kj/mol*k so that you get your final answer in kj. Also make sure to convert celsius to kelvin. 62 + 27...

Namratha Gujje

Q: What did the thermometer say to the graduated cylinder?
A: "You may have graduated but I have many degrees!"

Namratha Gujje

I'm so sad I missed this. Sounds like sooooo much fun. Hopefully there will be something else like this.

Namratha Gujje

I found handwriting to be the best way because I need to find ways to quickly write down what the professor just said or wrote down and in order to do so I must paraphrase. In order to paraphrase I have to have a basic understanding of the concept so that I can accurately note is down. You can't rea...

Namratha Gujje

I miss being able to work at libraries. I feel like I work better when I am surrounded by other productive people and in quiet environments. During the quarantine I have been working in my living room where it is kind of loud and I have a really hard time concentrating sometimes. Being able to work ...

Namratha Gujje

The final is on Sunday (March 14th) 3/14 at 9:30 am-11:00 am

Namratha Gujje

I usually allow myself to do something that is completely unrelated to school for a couple of hours or even for a day. Allowing myself to focus on something that is not school and doing something that I found to be fun really helps me recollect myself and once again work hard on school items. You ju...

Namratha Gujje

I am a part of AMWA (American Medical Women's Association) and I have also been working as a research assistant in a psych lab. I am not thinking of adding anything to do that though because I am already kind of overwhelmed with school.

Namratha Gujje

^I agree. If you are referring to the order in which the reactants and products should be written, I don't think the order should matter much. As long as the reactants are with the reactants and the products are with the products then you should be good.

Namratha Gujje

Step-Ups usually get more down to the basics. The UAs go slower through the problems and explain the basics of the main concepts we are learning. The workshops are more advanced. The UAs work through more difficult book problems or past midterm/final problems at a faster pace.

Namratha Gujje

I've been needing new book recommendations so this thread is very much needed. I have been just rereading Percy Jackson books when I have the time lol. I have heard that the book Six of Crows is really good. That is going to be my next book, maybe you all will like it too.

Namratha Gujje

I've been listening to a lot of telugu (Indian) music recently so I can't really recommend something that you all might like haha. But a group chemistry playlist would definitely be fun to have. We should definitely make one.

Namratha Gujje

Hi!

I would just say start studying as soon as possible. Do the textbook problems, go to UA sessions and ask the UAs, TA's or the professor for help if you are confused by any topic of chemistry.

Namratha Gujje

Congratulations to us! Hope everyone had a fantastic weekend to rest and prepare for these next couple of weeks. Good Luck to everyone, we need to continue working hard in this final stretch!

Namratha Gujje

It would be the safest option to just stick with Kelvin unless it specifically says otherwise.

Namratha Gujje

Hi! I honestly was hoping to do a lot better on the final as well so I would suggest for the both of us to study earlier for the final. As well as starting to study earlier, we should also start reviewing/redoing the assigned textbook problems. Also going to office hours to get help on concepts that...

Namratha Gujje

Currently I am craving brownies with ice cream!!!

Namratha Gujje

Happy Valentine's Day!

Your message is soo sweet and I hope you had an amazing Valentine's Day! I love you too!

Good Luck on your midterm next week! You are going to do amazing!

Namratha Gujje

*calculate the difference in mass and divide that by molar mass to get mols of the molecule.
*Convert 500 W to kJ

DeltaH = kJ/moles

DeltaS = deltaH/Temperature

Namratha Gujje

If the change in Gibbs Free energy in a reaction is negative then the reaction is going to spontaneous. You can use the reaction deltaG = delta H - T*delta S to figure out if H and S need to positive or negative for the reaction to be spontaneous.

Namratha Gujje

If you get a total of 200 points out of 400 then you can pass the class with a C-

Namratha Gujje

A Valentine's Day Pun: A hug with u is just toxic (hg)

Namratha Gujje

I am so nervous for this midterm. I have to spend so much studying this week. You all will do amazing though. You are working hard everyday for this class and your other classes. You are all geniuses!

Namratha Gujje

Q: What do you do with a dead chemist

A: you barium

Namratha Gujje

I need new book recommendations haha. I've just been rereading my favorite books over this quarantine. Right now I am reading the Heroes of Olympus books by Rick Riordan.

Namratha Gujje

A closed system is when it is sealed, it does not mean that there cannot be energy transfers. In an isolated system it is both sealed and insulated and there cannot be any energy transfers.

Namratha Gujje

I was planning on taking 14BL by itself next quarter and then take 14C fall of 2021, but now I might just take 14C and 14BL together. I guess it really would depend on how hard the people taking it right now say it is. I don't want to overload myself with chemistry.

Namratha Gujje

I have been watching Teen Wolf which honestly is a really good show. I wasn't expecting it to be this good when I first started it. 10/10 would recommend.

Namratha Gujje

I don't see an option for CC on bruincast. Maybe that can be something arranged if we talk to our TA's

Namratha Gujje

I haven't heard anything from Lavelle specifically, but I know that it usually takes about a week for midterm results to come out.

Namratha Gujje

Typically for UCLA 93 or above is an A and anything below a 93 would be an A-. I think that is what Lavelle follows as well.

Namratha Gujje

I honestly complete understand what you are going through. I definitely feel the same way. I feel like I am constantly working and can barely make time for myself or to do something fun or relaxing for myself. I am currently trying to create that balance though. I think something that I am going to ...

Namratha Gujje

Last quarter for 14A we weren't allowed to review our tests by ourselves. We could only do it during the TA's office hours. I am assuming that this is how its going to happen this quarter as well, so I would ask your TA is you can go over the midterm with them.

Namratha Gujje

The way that I have been thinking about it is putting -x when there is a initial concentration value and putting +x when the initial concentration of 0.

Namratha Gujje

Should be around 50 minutes.

Namratha Gujje

You can have a periodic table, the list of equations and calculator for the midterm.

Namratha Gujje

I have been listening to Kehlani and other R&B artists for American Music. But right now I have been listening to a lot of Hindi and Telugu Music (Indian Music) which can been really nice haha.

Namratha Gujje

I'm assuming that it will be the same style as 14A. So using 2 devices and having respondus downloaded onto your computer.

Namratha Gujje

Yes! Calculators are allowed for the exams. That includes graphing calculators too.

Namratha Gujje

Yes! That is the way I solved this problem. I square rooted each side of the equation which made solving much easier. I didn't have to use the quadratic formula.

Namratha Gujje

I like to do HIIT workouts at home. Compared with other forms of exercise, I find this to be the most beneficial and relaxing for me. After working out i definitely feel refreshed and much less stressed than I felt before. I also love to do Yoga. Doing Yoga helps me out a lot if I ever feel anxious ...

Namratha Gujje

My comfort movies will always be the Harry Potter movies. I have always loved the Harry Potter series. My siblings and I would watch the movies together every time my sister came home from college. That is one of the ways we bonded when we were younger and it continues to bring us closer to this day.

Namratha Gujje

When a value is less than x10-4, it is close enough to zero to the point where if we were to subtract 0.20 - 1x10-4, it wouldn't make much a difference on the 0.20 value. Because of this, we can approximate that 0.20 - 1x10-4 is still 0.20.

Namratha Gujje

Yes! This is such a good idea and would be very helpful for me!

Namratha Gujje

The points don't carry over. You would have to complete 50 new points in total over the next 10 weeks.

Namratha Gujje

I agree with Sarah! We should always use the units specified in the problem. However, I think in class Professor said that bar is used with partial pressure, but since it is so similar to atm that we usually just use atm. Maybe am I mistaken.

Namratha Gujje

Increasing pressure causes the volume to decrease therefore causing the concentration to change. This means that there will be a shift to bring the reaction back to equilibrium.

Namratha Gujje

Yes! When something changes like concentration, volume or pressure the reaction will not be in equilibrium anymore, but due to Le Chatalier's principle, something will adjust to bring the reaction back to equilibrium.

Namratha Gujje

From what I know they do not records their sessions, but maybe we can ask them to record them and put them on chem community. As mentioned before, some UA's do share the questions and answers to the worksheets that they worked on during their sessions. That may be a helpful alternative if they can't...

Namratha Gujje

Its saying that that the host needs to start the meeting for me

Namratha Gujje

Hi! Can you please go over how to tell if an acid is a strong acid or a weak acid and how to tell if something is a strong base or a weak base? Or like if given two molecules how to tell which is stronger/weaker? Thank You!

Namratha Gujje

From what I know I don't think so. We need to use an acid and base pair in order to do titration and if we don't know if its an acid or a base then we wouldn't be able to use its opposite to find the concentration. I think we would need to know if it was an acid or a base, along with the samples vol...

Namratha Gujje

Electronegativity decreases as we go down a period and Ba is much lower in group 2 meaning that it has a lower eneg than Be. Because of this, the electronegativuty difference would be greater in BaBr2 making it the one that is the most ionic.

Namratha Gujje

Thank You for saying that! It definitely needed to be said. We all got this! We are all smart and hardworking! Good luck to everyone! You all are going to do amazing!

Namratha Gujje

From what I know, we need Molarity when we are solving for pH of H+ molecule. pH = -log[H+]. pOH = -log[OH-]. For those equations we would need concentrations.
pH + pOH = 14. These equations show the relationship between pH, pOH and these equations can be used to find them.

Namratha Gujje

Hi! I was in a review session today where a TA said that the Schrodinger's wave function is used to find the quantum numbers for an electron. Essentially it helps find the position of the electrons. Apparently we shouldn't see too much of it on the final. Sorry I don't have a practice problem.

Namratha Gujje

The work function is the amount of energy required to remove an electron. The threshold frequency is the frequency of the work function.

Namratha Gujje

We will stop learning new material on Wednesday and Friday will be a review session with professor Lavelle.

Namratha Gujje

You would name them in alphabetical order :)

Namratha Gujje

I am kind of stressed for finals, but other than that I am doing okay. Waiting for the quarter to be over basically. Can't wait til Christmas!

Namratha Gujje

Lone pairs are more repulsive than bonded electrons, and therefore they take more space than bonded electrons.

Namratha Gujje

From what I heard, the topics that we spent the most time on during class/lectures will show up the most often on the final.

Namratha Gujje

Yes, every lone pair and every bond is considered to be one region of electron density. Double bonds and triple bonds count as one as well. More bonds does not equal more regions of electron density.

Namratha Gujje

Determining greater ionic character can be done by seeing which molecule has the greater difference in electronegativity. The trend for electronegativity increases along a group and decreases down a period. Based on this rule, we can assume that NaBr has more ionic character as there is a larger ene...

Namratha Gujje

H20 has a bent shape due to the two lone pairs on the oxygen. Due to electron repulsion the hydrogens bonds would be pushed down.

Namratha Gujje

I would suggest redoing the textbook problems that were assigned to us and reading the textbook. Something that I like to do is create flashcards to quiz myself on key concepts. If more people are interested, we could also form a study group to discuss difficult topics and work on problems together.

Namratha Gujje

Q: Why was the mole of oxygen molecules excited when he walked out of the singles bar?
A: He got Avogadro's number!

Namratha Gujje

The bond lengths are not the same length in every molecule with a double bond. The lengths vary per molecule. There are a lot of factors that determine the lengths of the bonds.

Namratha Gujje

Chlorine would have a lower ionization energy because the trend is that IE decreases as you go along a period and down a group. IE is the amount of energy it takes to remove the outermost electron on an atom. There is more IE for smaller atoms because their electrons are more tightly held together. ...

Namratha Gujje

One of the UA's during a Step-Up session said that typically elements that come after Phosphorous and Sulfur in the P-Block can have expanded octets.

Namratha Gujje

I look at the electronegativity difference of the two atoms to determine ionic character. The larger the difference is the more ionic character the molecule has. I don't think that the size of the molecule has an affect on the ionic character.

Namratha Gujje

The one with the most covalent character would be the two molecules with the smallest electronegative values. The one with the smallest electronegativity difference is the answer.

Namratha Gujje

I don't think we need to know a way to calculate the electronegativity of an atom. We do need to know the electronegativity trend on the periodic table of elements. It also wouldn't hurt to know what the most electronegative elements are. They are fluorine, oxygen, and nitrogen. I like to remember t...

Namratha Gujje

They are interchangeable terms. Other names for this include induced dipole-induced dipole. All of these terms are referencing the same thing.

Namratha Gujje

You need to make sure that the overall formal charge of the structure is the same throughout each resonance structure and you need to make sure that the octet rules are being followed for each atom.

Namratha Gujje

Another name for these London Dispersion Forces is induced dipole-induced dipole bonds. These are the weakest bonds because they are temporary dipoles. This makes it easier for those bonds to be broken making them the weakest.

Namratha Gujje

The most favorable structure can be determined by the formal charge of each atom of the structure. We would want as much atoms as possible to have a formal charge of zero.

Namratha Gujje

I don't think that we need to memorize the electronegativity values for all elements. I think that he expects us to know the electronegativity trend which is the same thing as the ionization energy trend.

Namratha Gujje

1/seconds applies to hertz only. Joules is equal to kg*m^2/S^2

Namratha Gujje

I was wondering the same thing. It would be very beneficial if I could see where I went wrong on some of the questions on the midterm. At least we will see them before the final exam. That would be very helpful.

Namratha Gujje

I think that the issue here is that you calculated the incorrect formal charges. The equation for finding the formal charge is FC = Valence Electrons - (# of bonds/2 + Lone Pairs). If you were to do that for NH4+, then you should get a different numbers. For H it would be FC = 1 - (2/2 + 0). The FC ...

Namratha Gujje

Only two electrons can have the same first three quantum numbers. No two electrons have the same 4 quantum numbers and this is because the last number, indicating electron spin, is different. The two electrons with the same 3 quantum numbers will have a different 4th quantum number.

Namratha Gujje

In order to find the energy of a photon you can use E = hc/wavelength and to find the energy of the electron you would have to use the kinetic energy formula. In order to do that you would first have to find the velocity which you can do by using the de broglie's equation. Make sure to convert micro...

Namratha Gujje

The enthalpy of fusion of water is 333.6 J/g. You would multiply the the amount of ice we have which is 493 grams to find out how much energy we need to completely melt the ice. After finding this number, we would find out how much energy there is in a photon with the wavelength 787 nm. We would use...

Namratha Gujje

Yes, for this equation c will always be the speed of light.

Namratha Gujje

In order to solve this problem, you would have to use Heisenberg's uncertainty equation which is. You would need to rearrange this equation so that you are solving for the uncertainty in the electrons velocity. This would just mean that v is greater than h/(4pi)(mass)(Position). Mass of an electron ...

Namratha Gujje

The more electrons that there are the smaller the radius is. The protons are tight and are pulled to the nucleus. This is opposite for electrons. If there are more electrons, or if there are free electrons then the radius will be bigger.

Namratha Gujje

I usually use all the digits, and wait to round at the end of the problem. I also keep track of the sig figs throughout the problem so that I know what I need to round to at the end of the problem. This is what I noticed my TA do as when he solved practice problems during our discussion section.

Namratha Gujje

it is due to the size. We can only measure how light affects objects at the atomic level and this is because the baseball is too big to notice such a change. Also, the electron's position can vary and this allows us to measure the way light affects its momentum.

Namratha Gujje

I am pretty sure that we do need to include the states of matters. It will never hurt us if we do. If a compound can be dissolved by water then it is aqueous. For the most part, we need to use out best judgement and any patterns that we notice during previous chemical reactions.

Namratha Gujje

I know that is a multiple choice exam and that it will given during our discussion section. This means that we only have 50 minutes to complete the exam. The number of questions was never specified, but the questions were made by the TA's and some were made by Professor.

Namratha Gujje

5 posts on chemistry community are due every Sunday by 11:59 PM

Namratha Gujje

Week 2, 3, and 4 homework is all due on Sunday of week 4. I would still recommend getting it all done beforehand so that you can practice the math/concepts that we will be tested on. Doing the homework will only make us more prepared for the midterm.

Namratha Gujje

I believe so! The light is only getting brighter, it is not changing its frequency/wavelength.

Namratha Gujje

I am definitely having a hard time staying focused with this distance learning thing. I usually like to work at the library when I need to focus and get things done. i can't do that now, so I am trying to implement new study practices and I am made myself a study area where I can stay focused. As fo...

Namratha Gujje

You would just say 273 Kelvin. Degrees aren't used for Kelvin

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