CHEMISTRY COMMUNITY

RaniyaFeroz_1E

Definitely read the textbook and maybe take some notes. That helped me a lot.

RaniyaFeroz_1E

Log out and try logging back again. If it still shows the same thing, then email your TA.

RaniyaFeroz_1E

It's the Boltzmann constant, and it's about 1.380649×10−23 J/K.

RaniyaFeroz_1E

And There Were None is a crime novel, and it's really good!

RaniyaFeroz_1E

Schitt's Creek on Netflix is really good!

RaniyaFeroz_1E

Well, I did better than Midterm 1, but still not that great. Just hope I finish with at least a B.

RaniyaFeroz_1E

A galvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0 M aluminum ion solution and another electrode composed of copper in a 1.0 M copper(I) ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C. How do I begin solving this problem?

RaniyaFeroz_1E

I never learned this, but this is very helpful. Thank you!

RaniyaFeroz_1E

I just used the one that gave me the units that the solution required.

RaniyaFeroz_1E

I have a midterm on Monday and Wednesday, but after that's done I'm planning on sleeping a lot, finishing Sky Castle(kdrama), and eating tons of food.

RaniyaFeroz_1E

I just binged watched Alice in Borderland. It's a Japanese drama, and it's really good, especially if you like the thriller genre.

RaniyaFeroz_1E

I suggest reading/skimming the textbook and going to the UA sessions.

RaniyaFeroz_1E

There is no correlation because endothermic and exothermic relates to heat.

RaniyaFeroz_1E

Last quarter, the final was way harder than the midterms, in my opinion. I definitely needed more time.

RaniyaFeroz_1E

Thank you, everyone!

RaniyaFeroz_1E

No, it's not. I think we're just supposed to memorize how to derive it.

RaniyaFeroz_1E

Thank you so much!

RaniyaFeroz_1E

The molar heat capacity for carbon monoxide at constant volume is CV, m=20.17 J/(K·mol) . A 10.00 -L fixed-volume flask contains CO(g) at a pressure of 6.00 kPa and a temperature of 25.0 °C. Assuming that carbon monoxide acts as an ideal gas and that its heat capacity is constant over the given temp...

RaniyaFeroz_1E

Weightlifting fairy, Flower of Evil (so good), It's Okay Not To Be Okay, Goblin, My Love From The Star (a classic), Crash Landing on You, and What's wrong with Secretary Kim. All of these are pretty good!

RaniyaFeroz_1E

Do the textbook problems! He literally put two problems from the textbook on Midterm 1. So if you can do them and master the technique, you should be fine!

RaniyaFeroz_1E

If you combine 330.0 mL of water at 25.00 ∘C and 100.0 mL of water at 95.00 ∘C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water. I'm really confused about how to do this problem, so if any of you could explain the steps, I would really appreciate that. Thank you, ...

RaniyaFeroz_1E

I'm taking it next quarter, along with 14C, to get it over with as soon as possible. We don't know what the situation will be next year and even if the school will be open or not. So I'd rather just get it over with sooner than later.

RaniyaFeroz_1E

Inert/Noble gases, such as Argon, have no impact on the reaction.

RaniyaFeroz_1E

He hasn't said anything yet, but we'll probably get an email in a few days.

RaniyaFeroz_1E

Try subtracting them from the initial molarity. If you get a negative output, then that one is not the correct answer.

RaniyaFeroz_1E

I think we can just disregard the temperature while doing calculations because they don't affect anything. When the temperature changes, however, so does the equilibrium constant but we haven't come across any problems like that.

RaniyaFeroz_1E

Attend the UA sessions and do the textbook problems assigned in the outlines. Also, review the module questions because last quarter some of the "conceptual" questions on Midterm 1 were taken from the module/post-assessment questions.

RaniyaFeroz_1E

Hi! so to solve this first I would write out that 53.5=[HI]^2/[H2][I2] and the ICE table with the concentrations of H2 and I2, which are both 0.4, and HI would be 0, and so you know H2 and I2 would both lose x while HI would gain 2x but you don't know the value of x, so you can plug in 2x for [HI] ...

RaniyaFeroz_1E

Thank you so much, everyone!!

RaniyaFeroz_1E

Midterm 1 is on Friday, Jan 29th. Here is the link for the exam schedule: https://lavelle.chem.ucla.edu/wp-conten ... hedule.pdf.

RaniyaFeroz_1E

On his website, there's a link for the exam schedule and in that, it says that the exams are taken "In class," or during the lecture. Here is the link: https://lavelle.chem.ucla.edu/wp-conten ... hedule.pdf

RaniyaFeroz_1E

Yes, Q can reach K, and when that occurs (Q=K) then the reaction is at equilibrium. Also, yes Q is the value that is calculated when the reaction isn't at equilibrium. On the other hand, K is only calculated when the reaction is at equilibrium.

RaniyaFeroz_1E

Yes, Q can reach K, and when that occurs (Q=K) then the reaction is at equilibrium. Also, yes Q is the value that is calculated when the reaction isn't at equilibrium. On the other hand, K is only calculated when the reaction is at equilibrium.

RaniyaFeroz_1E

I'm confused about this as well. I know that the midterms will be during the Friday lecture, but I don't know if we'll take it in our discussion sections. However, Dr. Lavelle will probably send an email regarding the midterms sooner or later.

RaniyaFeroz_1E

The Ka of a monoprotic weak acid is 0.00214. What is the percent ionization of a 0.121 M solution of this acid?
I'm confused about how to calculate the percent ionization.

RaniyaFeroz_1E

I'm assuming you're asking how to solve the problem. For the reaction given, you need to rearrange equations 1 and 3. You would multiply the first reaction by 3, and then flip the third equation around. By doing this, when you add the two equations, you get the reaction given initially. To find the...

RaniyaFeroz_1E

They're inversely proportional. Increasing the pressure will decrease the volume.

RaniyaFeroz_1E

K would just be 1/K when you reverse a reaction. I think Dr.Lavelle had an example of this in his first lecture.

RaniyaFeroz_1E

Consider the reaction of NH3 and I2 to give N2 and HI. 2NH3(g)+3I2(g)↽−−⇀N2(g)+6HI(g) K Using two or more of the given equations, determine the equilibrium constant, K, for the reaction of NH3 with I2. H2(g)+I2(g)↽−−⇀2HI(g), Ka=160 I2(g)↽−−⇀2I(g), Kb=2.1×10^−3 N2(g)+3H2(g)↽−−⇀2NH3(g), Kc=3.6×10^−2 H...

RaniyaFeroz_1E

At a certain temperature, the equilibrium constant, Kc, for this reaction is 53.3.

H2(g)+I2(g)↽−−⇀2HI(g)
Kc=53.3

At this temperature, 0.400 mol H2 and 0.400 mol I2 were placed in a 1.00 L container to react. What concentration of HI is present at equilibrium?

RaniyaFeroz_1E

Missing one discussion is ok because they're not mandatory. You can maybe go to your TAs office hours or ask someone in your section to tell you what you missed.

RaniyaFeroz_1E

You should go to the UA/step-up sessions. Also, do the textbook problems that are in the outline. Those really helped me last quarter.

RaniyaFeroz_1E

The deadline is Sunday at 11:59 pm. However, some TAs are fine as long as you have your 50 posts by the end of the quarter. So just ask your TA to confirm.

RaniyaFeroz_1E

We should use Kelvin.

RaniyaFeroz_1E

My comfort movie would be Avengers and Avengers: Endgame. I don't think I'll ever get tired of watching these two movies.

RaniyaFeroz_1E

I plan on attending as many UA sessions as possible. Additionally, I'll go to Dr.Lavelle's office hours.

RaniyaFeroz_1E

Thank you, everyone!!

RaniyaFeroz_1E

Doing the textbook questions and attending the step-up sessions helps me.

RaniyaFeroz_1E

I'm pretty stressed about the final, but besides that I'm good. How about you?

RaniyaFeroz_1E

What is the oxidation state for the central metal atom in [AlCl4]−?

RaniyaFeroz_1E

For each metal complex, give the coordination number for the metal species.
a).[Pt(en)Cl2]

RaniyaFeroz_1E

What's the difference between pi bonds and sigma bonds?

RaniyaFeroz_1E

Noting that the bond angle of an sp^3 hybridized atom is 109.5° and that of an sp^2 hybridized atom is 120°, do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased?

RaniyaFeroz_1E

How many σ-bonds and how many π-bonds are there in (a) H2S and (b) SO2?

RaniyaFeroz_1E

I put my phone completely out of sight, and sometimes out of my room so I won't have the tendency to look at it. Sometimes, I listen to music on my laptop which helps me stay focused.

RaniyaFeroz_1E

I do the textbook problems for extra help and attend the step-up sessions. I also like to watch The Organic Chemistry Tutor sometimes.

RaniyaFeroz_1E

I don't feel that great about the second midterm, to be honest. But please remember that it's just one grade and one class. Also, since we have quarter units, one class doesn't affect our GPA as much. For the final though, try doing the textbook problems and attending the step-up sessions as they re...

RaniyaFeroz_1E

I would really suggest doing the textbook problems. They are usually harder than the midterm problems, so the midterms don't seem too hard for me. Also, try attending step-up lessons.

RaniyaFeroz_1E

I either watch a TV show or go on a long drive to relax.

RaniyaFeroz_1E

I think the only equation we probably need to know is the formal charge equation to help us with Lewis structures. But besides that, I don't think there will be any other calculation problems on this midterm.

RaniyaFeroz_1E

The question is basically asking what orbital would you remove an electron from, to make the charge of the ion +1. For example, Ge has an electron configuration of [Ar] 3d^10 4s^2 4p^2. In order to make the ion +1, you would remove an electron causing Ge to have 31 electrons and an electron configur...

RaniyaFeroz_1E

Can someone explain what Zeff and shielding are, and how they relate to each other? I read the textbook but ended up getting more confused.

RaniyaFeroz_1E

I'm also confused about this. I think the atom H is bonded with (N, O, or F) might be a deciding factor of the bond length, but I'm not sure.

RaniyaFeroz_1E

There were many questions in Sapling that asked us to calculate the oxidation number of an atom. Will this be on the midterm?

RaniyaFeroz_1E

Yes, please!! I need the help.

RaniyaFeroz_1E

Me too, but there's another midterm coming up, and now that we know what his questions are like it might be easier and we might do better. So please don't feel bad!

RaniyaFeroz_1E

Try doing the textbook problems! They were harder than what was on the midterm, so the problems on the midterm were easy for me to do.

RaniyaFeroz_1E

Sera Aintablian 3C wrote:Do we need to know the irregularities in the trend for ionization energies?

I have the same question.

RaniyaFeroz_1E

No, you would write 1.03 x 10^-59m as the answer because 1.03m and 1.03 x 10^-59m are extremely different answers. 1.03 x 10^-59m is a very small value, almost close to 0.

RaniyaFeroz_1E

Happy Halloween!! My family and I dressed up and watched horror movies. We also ate a lot of candy and food.

RaniyaFeroz_1E

I think after everyone takes it. I looked on CCLE and there's a make-up midterm link, probably for those who missed it or had technical issues. So probably after they are done taking it, we'll get our scores.

RaniyaFeroz_1E

I think Dr.Lavelle mentioned in one of his lectures that we don't need to know how to derive equations so you should be fine.

RaniyaFeroz_1E

I completely agree Meghan! Currently, I am trying to do the assigned textbook questions. However, I also plan to rewatch the modules, take the post-assessments again, and do the workshop worksheets. It is very overwhelming and stressful, but hopefully, it pays off. My advice would be, if you are com...

RaniyaFeroz_1E

A UA did a problem where the reaction was 2 steps, and each step had its own limiting reactant.

RaniyaFeroz_1E

Yes, if oxygen is in excess, then the other reactant would be the limiting one.

RaniyaFeroz_1E

Non-metals typically have a much higher electronegativity than metals, and I learned from my life science class, that as the number of protons increases, the electrons are held more tightly by the atom, if it makes sense. Since the difference in electronegativity is so big, the non-metal "steal...

RaniyaFeroz_1E

Yes the fundamentals will be on the midterm!

RaniyaFeroz_1E

In the Rydberg equation, is n1 always the initial and n2 always the final? or is n1 always just the lowest energy value and n2 the highest? Hi Annabelle! if you are using the frequency is equal to Rydberg's constant((1/(n162)) - (1/(n2^2))), then yes, n1 will always be the initial quantum energy le...

RaniyaFeroz_1E

The midterm will cover all the material up to the third week. He explains this in his announcement on his website. "Midterm 1 covers all material up to the end of Week 3. This is up to Q21 in Sapling (quantum) homework. In Outline 2 below, all topics except the last three listed. MT 1 is up to ...

RaniyaFeroz_1E

You need an external camera. Some TAs said that we can use our phones to be on zoom while taking the test and being on respondus on our laptops. Dr.Lavelle talks more about that in this post: https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=157&t=63679 Also, we have to use the link given to u...

RaniyaFeroz_1E

You need an external camera. Some TAs said that we can use our phones to be on zoom while taking the test and being on respondus on our laptops. Dr.Lavelle talks more about that in this post: https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=157&t=63679 Also, we have to use the link given to u...

RaniyaFeroz_1E

Hi! Dr. Lavelle wants us to use an external camera so that we can show our work area. We can also use our phones to join the zoom meeting, while using respondus and taking the test on our laptops/computers. Lavelle answers the question in this post: https://lavelle.chem.ucla.edu/forum/viewtopic.php?...

RaniyaFeroz_1E

The electron in a hydrogen atom is excited to the n=5 shell and emits electromagnetic radiation when returning to lower energy levels. Determine the number of spectral lines that could appear when this electron returns to the lower energy levels, as well as the wavelength range in nanometers. I was ...

RaniyaFeroz_1E

When a metal was exposed to photons at a frequency of 1.34×1015 s−1, electrons were emitted with a maximum kinetic energy of 4.00×10−19 J.
Calculate the work function, Φ, of this metal.

How should I do this problem?

RaniyaFeroz_1E

We can only use integers for moles/stoichiometric coefficients. I don't know if you'll get points taken off if you leave it as a fraction. But you should change the fractions into integers to be on the safe side :)

RaniyaFeroz_1E

His class website has a section called "Weekly Online Discussion," which talks about Chem Community. You have to post at least 5 times a week. You can obviously post more but the max points you can get in one week are 5 points.

RaniyaFeroz_1E

You have to use the work energy given in the question, but since it's given in kJ/mol, you have to convert it to find the amount of energy for only a single sodium atom. You'd convert 150.6 kJ/mol to 150600J/mol and then divide that by Avogadro's number to find the energy needed in joules. 150.6 kJ...

RaniyaFeroz_1E

Which one of following is not describing the photoelectric effect? A. E (photon) – E (remove e-) = E (excess) B. E (photon) – E (remove e-) = EK (e-) C. hv - work function = 1/2mv2 D. λv = c E. None of the above I though it was none of the above because I saw all the equations when working on the mo...

RaniyaFeroz_1E

Since I am taking chem after 2 years, I like to take notes. Also, I think that even if you know the subject taking notes engrains it into your mind and you can use this knowledge when the course gets more challenging. However, you're not required to take notes. :)

RaniyaFeroz_1E

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. In the previous step, it required me to calculate the kinetic energy which was: 1.99 x 10^-19 J. In this step the question is asking: How much energy is req...

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