CHEMISTRY COMMUNITY

Britney Tran IJ

its a constant that will be given on the equations sheet! no need to memorize it

Britney Tran IJ

you just have to convert it into molar concentration to find your k

Britney Tran IJ

Ziyan Peng 3A wrote:
Chem_Mod wrote:No class that day due to midterm. :-)

Hello :) Are there any accommodations in place for international students for the midterm like there is for the final? Thanks in advance!

I believe that there are accommodations for international students! The info should be on his syllabus.

Britney Tran IJ

You would need to know whether the reaction is exothermic or endothermic, thus determining whether heat is a reactant or product within that rxn.

Britney Tran IJ

when the reaction shifts right, the production of products is being favored.

Britney Tran IJ

yes, the 14b exams will take place during your lecture time

Britney Tran IJ

sapling is mandatory! the first assignment is due next Sunday of week 2

Britney Tran IJ

jessicaosuna_1F wrote:It's basically just a principle that tells us what the effects of different changes in conditions do the chemical equilibria.

this chart is super helpful tysm!

Britney Tran IJ

aqueous solutions can but solids/liquids cannot

Britney Tran IJ

Quick links is really helpful when you need to find your previous posts, new posts, and other categories!

Britney Tran IJ

I definitely felt rushed! I'm not confident in any of my answers either :(

Britney Tran IJ

p is momentum or mass*velocity

Britney Tran IJ

ni curve but he did say that 10 bonus points would be added to the finals grade

Britney Tran IJ

50% or better to get at least a C-

Britney Tran IJ

I recommend going over the UA worksheets and completing the textbook problems! I like to also watch different videos on topics that I don't have a clear understanding of.

Britney Tran IJ

Wednesday! review is on Friday

Britney Tran IJ

there isn't a curve but I think the average will be adjusted in the end

Britney Tran IJ

1. name ligands and metal, put the ligands in alphabetical order
2. put the appropriate prefixes for the ligand according to the number present
3. find the oxidation number of the metal and put it in parenthesis next to the metal
4. add any cations or anions that may exist

Britney Tran IJ

you have to contact your ta! I think you can review over the problems that you missed on the midterm during their office hours

Britney Tran IJ

my finals plan is to attend as many u.a sessions as I can and do the textbook problems again! I think I'm also going to go over the sapling hw questions as well.

Britney Tran IJ

Kat Stahl 1L wrote:I found a video that I thought was really helpful in this concept. Here it is!
https://www.youtube.com/watch?v=n2Z2tASz7Uk
Hope this helps you!

thank you so much for this resource! it definitely helped a lot

Britney Tran IJ

it will be cumulative of all of the materials we've learned so far

Britney Tran IJ

thank you so much! this is very helpful

Britney Tran IJ

I think you get partial credit put you will end up losing points!!

Britney Tran IJ

Dr. Lavelle said that a 50% is needed to pass, but I think the rest of the grades follow the same scale where 90-93% is an A-, 93-97% is an A, 97-100% is an A+, and the rest of the grades follow the same pattern? I'm not 100% sure but that's what I've been going off of. do you guys know if he will ...

Britney Tran IJ

Darren1e wrote:Like the above question asked, did Dr. Lavelle mention that 14b will be asynchronous as well?

Im pretty sure it'll be the same as chem14a where the lectures are recorded but Im not sure!!

Britney Tran IJ

Electrons will enter the 4s stage first before moving onto 3d because 4s has a lower energy, but 4s will be the first orbital to lose the electrons during ionization.

Britney Tran IJ

Lewis acids are electron acceptors, and an easy way to remember that is the "acid" and "Acceptor" both start with a. Lewis acids are generally cations and they dont have lone pairs. Lewis bases are the donators, and they are usually anions and will maybe have lone pairs.

Britney Tran IJ

Constance Newell wrote:does anyone know if we will be able to review over the questions in midterm 1

I think someone said that you could review them during your t.a's office hours but I'm not too sure!! I would ask your t.a

Britney Tran IJ

https://courses.lumenlearning.com/bound ... ctet-rule/

this is a good resource that summarizes all of the exceptions!!

Britney Tran IJ

hydrogen bonding deals with hydrogen bonding with fluorine, oxygen, and nitrogen! An easy way to remember this is FON!

Britney Tran IJ

One thing in particular I think you should definitely know is that when deciding which atom a radical goes on, you have to consider electronegativity. It will always go on the atom that is least electronegative because that one will, of course, attract less electrons. So if you had a bond between C...

Britney Tran IJ

nope but we do need to know the length of the bonds in regards to the number of bonds

Britney Tran IJ

The difference between Nitrite and Nitrate is the number of Oxygen atoms they have. Nitrate=NO3 and Nitrite=NO2 both have a charge of -1. I don't know for sure whether we'll need it memorized, but he hasn't said we need to memorize it so I don't believe we do. Yep! My t.a said that the formula shou...

Britney Tran IJ

Hi there! I'm having a little trouble understanding why ionization energy increases as you go across a period. Any clarification would be greatly appreciated!!

Britney Tran IJ

Carbon dioxide is a polar molecule that contains a carbon atom in the center that has a partial positive charge. This positive carbon atom attracts, and thus accepts, the lone electron pairs present in the two oxygen atoms with negative partial charges. For this reason, carbon dioxide is acting as ...

Britney Tran IJ

Because double bonds have more electrons, there is a stronger attraction/pull so the length is shorter

Britney Tran IJ

Hi there! Could anyone explain what the importance of the formal charge is? I understand how to dine it but I'm not really sure what the values mean. Thank you!

Britney Tran IJ

Did Prof.Lavelle go over the Bohr radius during lecture? It's mentioned in the textbook, but I'm not sure if it holds any importance for this class. Thank you!

Britney Tran IJ

Hi there! During the lecture, Lavelle talked about how half full d^5 and full d^10 subshells have lower energy. I dont really understand the concept of this and how he used it to find the levels/orbitals for Cr and Co. I would appreciate any clarification on these two exceptions and the steps he too...

Britney Tran IJ

reva_bajjuri wrote:for this problem, would you use the 4 sig figs in the conversion from joules to electo volts or are those not significant figures?

I believe you would use the sig figs from the value given in the problem (0.0431). Therefore, your answer should have 3 sig figs.

Britney Tran IJ

When a problem asks for the number of photons, atoms, e.t.c you would use Avogadro's number

Britney Tran IJ

like everyone said, I usually don't worry about sig figs until I have my final answer!

Britney Tran IJ

any post works whether that is commenting or posting. you can check the status under your profile!

Britney Tran IJ

I would keep it in m so that it cancels out with velocity(m/s)

Britney Tran IJ

Well I don't have an outline or a list of equations, but everything that we learned on Wednesday of week three and before that is fair game, which goes as far as the basics of orbitals. So in short, you should have a handle on these topics: Stoichiometry Unit conversion Dimensional Analysis Propert...

Britney Tran IJ

I've been doing all of the textbook problems and pre module quiz questions, and if I dont understand something I would go to peer sessions or rewatch the lectures! Khan academy is also really helpful.

Britney Tran IJ

my ta said that it was fine just as long as they can see what you're writing!

Britney Tran IJ

problem: The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 3 103 km?s21. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 * 10^16 Hz. How much energy i...

Britney Tran IJ

During lecture, Dr.Lavelle said that a wave is more likely to have particle like behavior given if the mass is higher and the wavelength is smaller. I don't really understand this concept. Can someone explain?

Britney Tran IJ

I think its usually written as nm but either is fine

Britney Tran IJ

During one of the step up sessions, the ua said that we'd only need to remember the visible light spectrum (ROYGBIV) but I'm not sure!

Britney Tran IJ

Hi there! I think what part c is referring to is the slope! Once you draw it out, you can see that the slope of the wave is smaller after the frequency decreases.

Britney Tran IJ

The audio visual videos and step up sessions are super helpful! I like to plan out which questions ill do for the week, and if I need any help I'll refer back to the textbook or go to office hours!

Britney Tran IJ

Is the energy released from a photon always positive then?

Britney Tran IJ

Hi. I was really lost too until someone explained it to me. So looking at the problem, the given information is that we have 1.000g of caproic acid. We have 2.275g of CO2 and 0.929g of H2O. Step one would be to find the carbon in CO2. In order to do this, you must take the molar mass of carbon (12....

Britney Tran IJ

Hi there! so would it be better to round the number or just truncate it?

Britney Tran IJ

I also just counted up all of the atoms as presented in the image and used the periodic table and molar masses of each element to find the amu!

Britney Tran IJ

so the chemistry community posts are due on Sunday at midnight instead of Friday right?

Britney Tran IJ

The molar mass of the metal hydroxide M(OH)2 is 74.10 g?mol21. What is the molar mass of the sulfide of this metal?

-can someone explain the steps to solving this? I went over the answer but I'm still a little confused.

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