CHEMISTRY COMMUNITY

Megan ODonnell 3F

Only use it in irreversible conditions when the external pressure is constant!

Megan ODonnell 3F

I didn't see his name come up when I enrolled in 14C

Megan ODonnell 3F

I personally take handwritten notes for my STEM classes because oftentimes there are a lot of diagrams involved so it''s easier that way.

Megan ODonnell 3F

It was around a week after the final was taken last quarter.

Megan ODonnell 3F

I try to incorporate nonschool related activities into my day like yoga and walking to break it up and remember that there are other things I enjoy doing

Megan ODonnell 3F

Calculate the equilibrium constants for the following reactions:

(a)
Mn(s) + Ti2+(aq)⇌Mn2+(aq) + Ti(s)

(b) In3+(aq) + U3+(aq)⇌In2+(aq) + U4+(aq)

Hi, I was wondering how I should approach this problem. Thanks!

Megan ODonnell 3F

Identify the reactions with K > 1 in the following list and, for each such reaction, identify the oxidizing agent and calculate the standard cell potential. (a) Cl2(g) + 2 Br−(aq)→2 Cl−(aq) + Br2(l) (b) MnO4−(aq) + 8 H+(aq) + 5 Ce3+(aq)→5 Ce4+(aq) + Mn2+(aq) + 4 H2O(l) (c) 2 Pb2+(aq)→Pb(s) + Pb4+(aq...

Megan ODonnell 3F

Suppose that each of the following pairs of redox couples is combined to form a galvanic cell that generates a current under standard conditions. Identify the oxidizing agent and the reducing agent, write a cell diagram, and calculate the standard cell potential from the standard potentials of the e...

Megan ODonnell 3F

For each reaction that is spontaneous under standard conditions (that is, K > 1), write a cell diagram, determine the standard cell potential, and calculate ΔG° for the reaction: (a) 2 NO3−(aq) + 8 H+(aq) + 6 Hg(l)→3 Hg22+(aq) + 2 NO(g) + 4 H2O(l) (b) 2 Hg2+(aq) + 2 Br−(aq)→Hg22+(aq) + Br2(l) (c) Cr...

Megan ODonnell 3F

(a) Write balanced half-reactions for the redox reaction of an acidified solution of potassium permanganate and iron(II) chloride. (b) Write the balanced equation for the cell reaction and devise a galvanic cell to study the reaction (write its cell diagram). I figured out the correct answer to this...

Megan ODonnell 3F

I'm really stressed honestly about the final because I need to do really well on it to bring my grade up since its the last exam.

Megan ODonnell 3F

I read Little Fires Everywhere by Celeste Ng this summer and its a really good book that is a quick easy read that also has a TV show on Hulu!

Megan ODonnell 3F

I think you can but you just won't earn extra points for your grade.

Megan ODonnell 3F

I love rewatching Grey's Anatomy! The show has so many seasons that its really easy to watch as background music to homework or studying.

Megan ODonnell 3F

I love Cava, Ami Sushi, Kazunori, and ItsBobaTime has really good boba!

Megan ODonnell 3F

Congrats everyone! Goodluck!

Megan ODonnell 3F

OIL RIG (Oxidation Is Losing and Reduction Is Gaining)

Megan ODonnell 3F

It depends on what units are given or what units the desired value is.

Megan ODonnell 3F

I am the same way! I just try to remind myself that the test now is out of my hands and that I did the best I could. Good luck!

Megan ODonnell 3F

Yes, I believe that you can assume it's 25ºC or 298K.

Megan ODonnell 3F

Lavelle is probably updating grades or something, they should be back shortly.

Megan ODonnell 3F

My roommates and I are rewatching Greys Anatomy and we are still addicted to it!

Megan ODonnell 3F

They are on the equation sheet so it isn't necessary thankfully.

Megan ODonnell 3F

I agree with what some other people said, I try to get my work done during the day before dinner so then afterward I can allow myself to relax while knowing that I put time into studying before.

Megan ODonnell 3F

I just try to do as many practice problems and attend as many review sessions as I can before the test. And then give me enough time in the morning to wakeup and eat my breakfast so that I have enough energy to take it!

Megan ODonnell 3F

I am enrolling in Chem 14C, LS7C, and LS23L next quarter.

Megan ODonnell 3F

I plan on taking Chem 14BL this spring quarter and waiting to take 14C the fall of next year.

Megan ODonnell 3F

I think as long as you have the 50 by the end of the quarter, with 5 posts per week it should all even out. Dr. Lavelle mentioned that he was counting the posts up to this week so I think it's okay if you haven't done them yet.

Megan ODonnell 3F

I also have that error, with my grade saying 20/25. I think though it will even out in the end because Dr. Lavelle mentioned that this week was included in that grade.

Megan ODonnell 3F

I feel the same way as well :( I think the hard part is that in order to feel as though you have done well grade-wise doesn't leave that much room for error, considering that there aren't very many problems on each midterm. There are definitely many of us out there though feeling the same way so you...

Megan ODonnell 3F

Temperature is a measurement of the motion of particles, whereas enthalpy is the heat given off or absorbed during a reaction.

Megan ODonnell 3F

You would put the mass of the substance.

Megan ODonnell 3F

Thank you!

Megan ODonnell 3F

I think you can but I'm not one hundred percent sure.

Megan ODonnell 3F

I'm taking BL during the spring so that I can get the chemistry series done within two years.

Megan ODonnell 3F

Adding a noble gas has no effect on the equilibrium of the reaction.

Megan ODonnell 3F

If the enthalpy (∆H) is given, then if it is negative the reaction will be exothermic and if it is positive the reaction will be endothermic.

Megan ODonnell 3F

I like watching rom-com movies like the Wedding Planner as they are very easy to follow and are funny.

Megan ODonnell 3F

I think they switched it to during lecture this time.

Megan ODonnell 3F

I find that the book problems are definitely the most helpful, and then attending UA peer review sessions are also very informative.

Megan ODonnell 3F

It is the inverse of the forward reaction, so you would take 1/K to find the reverse constant.

Megan ODonnell 3F

I find that the textbook problems from Lavelle's outlines are the most helpful as some of them have shown up verbatim on the past exams. Additionally, I find that the UA workshops are really helpful in doing additional problems with the guidance of the UAs because you learn new ways of approaching p...

Megan ODonnell 3F

I would assume they would all be multiple choice and during the lecture, with the exam being proctored and with the use of Respondus. Also, usually most if not all of the points are worth the same amount of points or around the same amount.

Megan ODonnell 3F

I have found so far that what works the best are going to the peer-review learning sessions and doing the problems from the textbook in the outlines.

Megan ODonnell 3F

We would be asked a question regarding temperature given context on the enthalpy and whether the reaction is endothermic or exothermic.

Megan ODonnell 3F

It seems to me from the lectures that they mean the same thing!

Megan ODonnell 3F

I was told that bars to atm is approximately 1:1

Megan ODonnell 3F

P= pressure
V= volume
n= number of moles
R= gas constant
T = temperature

Megan ODonnell 3F

I think it depends on how comfortable you are with the material during the week. It is definitely helpful going to more leading up to the midterms and final as they give you an opportunity to go over extra practice problems with others.

Megan ODonnell 3F

Q refers to a general reactant quotient regardless of whether it is referring to a concentration or pressure, Qc is a reactant quotient regarding concentration and Qp is a reactant quotient regarding pressure.

Megan ODonnell 3F

Yes, M refers to molarity which is mole/volume

Megan ODonnell 3F

I'm pretty sure they are either ungraded or for extra credit for this course, so no need to worry!

Megan ODonnell 3F

I found that going over a ton of the practice problems helped me the most, and the review sessions for each specific topic that the UAs and TAs hosted were also really helpful.

Megan ODonnell 3F

Thank you to whoever sent the link!

Megan ODonnell 3F

I don't think partial credit will be given, however, Dr. Lavelle mentioned in his last email that he is giving everyone 10 points back on the final.

Megan ODonnell 3F

Hi, I think that our posts will stay up on Chemistry Community, as I am able to see posts from before the quarter started.

Megan ODonnell 3F

No, a salt is usually the resulting product in a neutralization reaction.

Megan ODonnell 3F

I plan on going home, visiting my friends a ton, and spending time with my family!

Megan ODonnell 3F

Stressed about finals!

Megan ODonnell 3F

I would solve and keep all of the numbers that show up on your calculator value and then at the end determine sig figs.

Megan ODonnell 3F

Yes, that sounds correct.

Megan ODonnell 3F

Usually I first try to determine through symmetry, if the shape of the molecule and the bond angles are the same throughout, it is most likely nonpolar. However compare and contrast the bonded atoms to the central atom, an atom with a fluorine bonded on one side and a hydrogen bonded on the other si...

Megan ODonnell 3F

I made a Quizlet to remember all of the potential bond angles a specific molecular shape could have, however when determining each individual angle I try to draw out the lewis structure and visualize the angle in relation to all of the other ones.

Megan ODonnell 3F

H2O is bent since there are two bonds formed and two lone pairs which force the bonded oxygens closer to each other.

Megan ODonnell 3F

I make a Quizlet and go through it until I get all of the shape names correct.

Megan ODonnell 3F

No, when determining molecular shape each bond (whether it be single, double, or triple) counts as one entity.

Megan ODonnell 3F

NaCl is ionic because it has a great enough difference in electronegativities between the metal and non metal, whereas HCl doesn't have a large enough difference in electronegativities for the Cl to take the electron from H. Usually, a metal and a nonmetal form an ionic bond, and two nonmetals form ...

Megan ODonnell 3F

The difference in electronegativities isn't significant enough for it to be a polar bond.

Megan ODonnell 3F

Usually symmetry, and if you can determine the difference in electronegativities. If the shape of the molecule is mostly symmetrical it is more likely to be non polar.

Megan ODonnell 3F

Ionic bonds are between a metal and non metal whereas a covalent bond is between two nonmetals.

Megan ODonnell 3F

Determine the difference in electronegativities between the two atoms in the molecule you are examining, and which ever molecule produces the greater difference is the molecule that is more ionic.

Megan ODonnell 3F

It is usually the least electronegative atom, however hydrogen is an exception to this rule.

Megan ODonnell 3F

Nitrate has three oxygens and nitrite has two oxygens. Generally if the ending is "ite" it has one less than the "ate" version.

Megan ODonnell 3F

I am not sure, but it is not outlined in the syllabus so I doubt it.

Megan ODonnell 3F

I haven't been to the step-up sessions but I know that when I took the last midterm for this class, a couple of the questions came directly out of the textbook and so I found that doing the practice problems ended up being really helpful.

Megan ODonnell 3F

Khan academy always has good review videos that go into great detail and are good at explaining concepts!

Megan ODonnell 3F

Thank you!

Megan ODonnell 3F

I am working through the textbook problems, the homework problems, and the problems on the worksheet that my TA gave me.

Megan ODonnell 3F

I think you can use your phone or ipad if you can't get a webcam.

Megan ODonnell 3F

I have been going through one textbook unit (ie Focus 1A and the practice problems) per night, working on the sapling homework, and doing the worksheets my TA has given me.

Megan ODonnell 3F

They should be out by sometime tomorrow!

Megan ODonnell 3F

v with italics is frequency whereas v non-italics is speed.

Megan ODonnell 3F

It will cover fundamentals up to focus 1D!

Megan ODonnell 3F

Thank you for the info!

Megan ODonnell 3F

We have only used c as the speed of light so far!

Megan ODonnell 3F

It is 12 problems on CCLE during discussion section

Megan ODonnell 3F

Thank you!

Megan ODonnell 3F

It's not going to hurt your grade if you don't do every single question, but I would do a few questions from each segment in order to self study for the exam and make sure you know all of the topics that are being covered.

Megan ODonnell 3F

I think that they strongly recommend that we have external webcams because of the way that the lockdown browser works, but it seems like you can still take the test without one, maybe just less conveniently. My TA also said that maybe we will be able to take the test on an ipad if you have those, an...

Megan ODonnell 3F

Congrats!

Megan ODonnell 3F

Amazon probably has the most variety and most reasonably priced. Plus if you are a prime member, shipping is very fast!

Megan ODonnell 3F

Thank you so much!

Megan ODonnell 3F

Here is the latest news on CRISPR:

https://www.sciencemag.org/news/2020/10 ... stry-nobel

Megan ODonnell 3F

I always just try not to wake up right before the test starts, but rather give myself enough time in the morning to have a routine to make food, brush my teeth, etc. I also find it helpful to do some last minute review or practice problems to get my brain warmed up. Hope this helps!

Megan ODonnell 3F

Thank you so much for posting this! I love hearing about your experience as a medical student as I hope to become one eventually.

Megan ODonnell 3F

Don't trust atoms, they make up everything.

Megan ODonnell 3F

I would search for the subject of your post when on the main page. Your question should pop up.

Megan ODonnell 3F

I find it helpful, especially when learning the different equations, constants, and their applications. If you don't like doing the readings, though, there are multiple other ways in which you can learn the material

Megan ODonnell 3F

Thank you so much for this post! As a pre-med student I find this very helpful.

Megan ODonnell 3F

Dr. Lavelle, Thank you so much for all of the work you have put into providing resources for this course, despite the difficulty during COVID-19 right now. I was initially anxious about taking this course since the lectures have so many people and the sheer size of the course made learning seem so d...

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