CHEMISTRY COMMUNITY

Claudia_Danysh_2B

I would probably wait until Lavelle sends out an email to give you an answer for sure but I know that the exam will be cummulative, so I would assume that the topics we spent the longest amount of time on would be most common on the final.

Claudia_Danysh_2B

k' will not always be the same because it depends on information that you get from your data!

Claudia_Danysh_2B

Reactions that occur relatively slow are kinetically stable. It helps me to remember that kinetics involve movement and reactions, and so reactions that are slow and not hectic, aka. stable, are kinetically stable!

Claudia_Danysh_2B

Yes, I think the best way to do this is to remember that you're looking for a line when you graph time vs. [A], ln[A], or 1/[A]!

Claudia_Danysh_2B

Hey guys I'm waitlisted in Chem 20L for the spring quarter and was wondering if anybody knows if people normally get off the waitlist/ knows Professor Henary's email so that I can ask him myself. Any info is appreciated!

Claudia_Danysh_2B

Essentially graphing the information of [A] vs. time, ln[A] vs. time, or 1/[A] vs. time can tell you which order your reaction is in.

Claudia_Danysh_2B

Yes, temperature can change the rate constant!

Claudia_Danysh_2B

What helps me a lot is actually listening to what Professor Lavelle is saying and then writing down my notes from what he has on his slides in a way so that it isn't all information jumbled together. I'll use arrows, bullet points, different colors, anything that can add more organization to the inf...

Claudia_Danysh_2B

Ya I haven't heard anything about a book like this sorry!

Claudia_Danysh_2B

Hey for anyone interested in this topic, there's an upper division class called "What's Cooking Chemistry in the Kitchen" I think and it mixes cooking with chemistry!!

Claudia_Danysh_2B

I solve for n by subtracting the moles of gas on the left from the moles of gas on the right.

Claudia_Danysh_2B

No, we don't need to have our products or reactants in a certain order. I think as long as they're all on the right side, its okay! :)

Claudia_Danysh_2B

Normally, the anode is what's being oxidized while the cathode is what's being reduced!

Claudia_Danysh_2B

Yes! It helps me to remember that for something to oxidize something else, it needs to take an electron away from that substance, meaning that it has to be reduced!

Claudia_Danysh_2B

Hey! I usually look over my notes to remind myself of the information and then look over textbook problems that I remember having some difficulty with!

Claudia_Danysh_2B

I just started watching Game of Thrones, I assume you've seen it but if you haven't, I definitely recommend!

Claudia_Danysh_2B

Thank you!!! More than half-way through the quarter!!

Claudia_Danysh_2B

Like someone said before, I prioritize sleep a lot in my life and I also try to do something every day that I know I'll be excited about. Even if it's something super small like eating a pbnj or watching an episode of a show at the end of the day. Having something to look forward to every day makes ...

Claudia_Danysh_2B

Toast is so underrated.

Claudia_Danysh_2B

I'm taking LS7B, Chem 14BL, and the third quarter of the 60's cluster!!

Claudia_Danysh_2B

Yes, the deadline is Sunday at midnight!

Claudia_Danysh_2B

Something that always helps me if making a short of summarized sheet of different concepts we go over. When I'm looking through my notes, I write down the main concepts or concepts within different things we've learned and then also have a section just with formula sheets. This always helps me becau...

Claudia_Danysh_2B

Hey guys, does anybody know any recommendations for who to try to get for 14BL next quarter?

Claudia_Danysh_2B

This post to the forum made me laugh out loud because his music for this week was so relaxing he always switches it up

Claudia_Danysh_2B

When you're talking about P in atm, use R=.0821, and when you're talking about energy or work, use R=8.314

Claudia_Danysh_2B

Can somebody clarify what an Ideal Gas is specifically?

Claudia_Danysh_2B

Hey guys, so we just took midterm 1 and I was wondering if anybody has a system/tips that they think have substantially helped them in class because I honestly need a new system. Before a midterm,I go over all of my notes again so that I'm sure that I understand material and then do practice problem...

Claudia_Danysh_2B

Hi guys, can someone give more clarification on what a reversible reaction is? I know systems do more work in reversible reactions and I understand why,I just am not exactly is "reversible" in a reversible reaction.

Claudia_Danysh_2B

Hey guys,
I'm trying to plan what series I wanna do next year like the LS series or Physics or starting O chem as a biochem major. Does anybody know if there's an order that people recommend, or if you really just take them in the order you want to?

Claudia_Danysh_2B

I'm taking Chem14BL because I heard that it's still just as easy to learn but sort've less work since you're doing everything online!

Claudia_Danysh_2B

No, we don't need to have any enthalpies memorized!

Claudia_Danysh_2B

Neutralization in a reaction is when an acid and a base react!

Claudia_Danysh_2B

We can assume that x is insignificant whenever K is less than 10^3!!

Claudia_Danysh_2B

Yes, we still include 2 in the K equation!!

Claudia_Danysh_2B

The temperature is supposed to be in Kelvin!!

Claudia_Danysh_2B

They are the same! I was also confused about this before

Claudia_Danysh_2B

Yup! No class that day!

Claudia_Danysh_2B

Basically, this is because although steam and boiling water can be the same temperature, steam has more internal energy because of the energy that is needed to be put in to be able to actually reshape the water bonds so that the water is able to become steam!

Claudia_Danysh_2B

Yes, a negative delta H is always going to be exothermic because it released heat in the process, making enthalpy a negative value. Additionally, a positive delta H value will always be endothermic because it required heat in the process!

Claudia_Danysh_2B

Hey guys, so recently we talked in lecture about how there are exo and endothermic reactions and I guess I'm just sort've confused now because online it says that all reactions are partially exo and endothermic and I was wondering if this was true/if anybody could clarify?

Claudia_Danysh_2B

Yes, Lavelle put this on the syllabus!

Claudia_Danysh_2B

I'm planning on spending time with family, my dogs, and hopefully picking up some new hobbies!

Claudia_Danysh_2B

This isn't a movie but Hannah Montana always makes me feel better! Also any Disney movie or comedy like Pitch Perfect

Claudia_Danysh_2B

I think you just need 50 by the end of the quarter because I remember hearing that you can make up for weekly posts that you missed as the quarter goes on!

Claudia_Danysh_2B

Hey! What has really helped me a lot is watching Lavelle's lecture and rewriting the notes in my own format so that I processed it when I watched lecture and then reaffirmed the information in my brain through my notes after watching. It also helps a lot to go over your notes at the end of each week...

Claudia_Danysh_2B

I would honestly look at what units are used in the problem and use those for my work!

Claudia_Danysh_2B

I wish you luck on your future!! :) It is really calming hearing another persons perspective and helps me think about what matters in the "big picture" instead of stressing over temporary issues!

Claudia_Danysh_2B

Yes! Just to clarify even more, Q is the reaction quotient while K is the equilibrium constant!

Claudia_Danysh_2B

I realized there's no chemistry joke forum under 14B..may the jokes continue!!

Claudia_Danysh_2B

I'm starting to think these jokes are too basic for everyone because I see no reaction..get it

Claudia_Danysh_2B

Water is amphoteric, meaning it can act as an acid and a base!

Claudia_Danysh_2B

Hey guys, does anyone have any tips of remembering all strong acids and bases?

Claudia_Danysh_2B

If H20 is the formula for water, is the formula for ice? H20 cubed!

Claudia_Danysh_2B

Hey so Dr. Lavelle has been talking about equilibrium constants a lot this week and I understand what he's explaining but I'm not entirely sure what an equilibrium constant actually is. Can anyone elaborate? Thank you

Claudia_Danysh_2B

Want to hear a joke about element 116? Uuh...

Claudia_Danysh_2B

I try to tell chemistry jokes, but sometimes there's no reaction

Claudia_Danysh_2B

So I know the coordination number is the number of bonds, but do we count one or two bonds when were looking at a double bond for coordination number? I know a double bond is two individual bonds so I think we count two but I just wanted to make sure!

Claudia_Danysh_2B

Yes to your first question, there is a pi bond in ethene as well as three sigma bonds so we can't fill the 2sp2 orbital with four electrons and that final electron has to go to the 2p orbital that is unhybridized. The hybridization doesn't actually change, the hybridization should always be sp2 for...

Claudia_Danysh_2B

Hey guys, so I was following Lavelle's lecture but then I got confused when he started explaining hybridization on ethene. So, I understand that we made three hybrid orbitals because the carbon has sp2 hybridization in ethene. I'm also pretty sure that we put the fourth valence electron in 2p instea...

Claudia_Danysh_2B

Does anyone have any tips for remembering molecular shapes? I looked up charts online and was just wondering if anybody has any advice!

Claudia_Danysh_2B

I would make a chemistry joke, but I heard the good ones Argon

Claudia_Danysh_2B

I don't trust atoms...I heard that they make up everything!

Claudia_Danysh_2B

Yes, in other words, a dipole is a partial separation of charges!

Claudia_Danysh_2B

Lone pair electrons do count as their own area of electron density!

Claudia_Danysh_2B

So I'm trying to sort out my understanding and was wondering if somebody could tell me if this is right. So, a single bond is a sigma bond and that a double bond is one sigma and one pi bond, but a double bond is also just called a pi bond even though its one pi bond and one sigma bond. Right?

Claudia_Danysh_2B

Hi guys, so I know that Cr and Cu are exceptions because you have a half-filled 4s orbital in both, but am wondering if this pattern follow for elements that are in the same column as Cr and Cu? For example, since Cr is [Ar](3d^5)(4s^1), is Mo [Kr](4d^5)(5s^1) so that it follows the same pattern as ...

Claudia_Danysh_2B

It helps me to distinguish these by knowing that you need two polar covalent molecules to have one dipole-dipole interaction!

Claudia_Danysh_2B

In short, yes because the atoms have to have opposite charges to be attracted to each other which ultimately means a partial positive and negative charged side when the two atoms bond!

Claudia_Danysh_2B

Just adding on to this...I used to get confused about this also but it helps me to remember that hydrogen bonds aren't actually bonds because we even draw them differently in diagrams. Whereas we draw a straight line for a single, double, or triple bond, we draw multiple short lines ( ex: | | | ) to...

Claudia_Danysh_2B

Hi! So the order from weakest to strongest intermolecular forces are as follows: London Dispersion Forces < Dipole-Dipole < Hydrogen Bonding < Ion-Dipole The difference between dipole-dipole and dipole-induced dipole is dipole-dipole is present with polar molecules verses dipole-induced dipole (or ...

Claudia_Danysh_2B

Hey guys, I know that electronegativity increases as you go up and to the right, but I'm confused on which matters more...the higher you are in the periodic table...or the further right you are in the periodic table. For example, would oxygen or chlorine be more electronegative?

Claudia_Danysh_2B

Q: Why was the mole of oxygen molecules excited when he walked out of the bar?

A: Because he got Avogadro's number!

Claudia_Danysh_2B

Yes, only those three atoms! But they also have to have a partial negative charge.

Claudia_Danysh_2B

Hi! No you don't because the way you can denote a double bond is by drawing two shared bond lines instead of one!

Claudia_Danysh_2B

They are not included and no, fluorine is the most electronegative atom!

Claudia_Danysh_2B

Hey, I don't know if there is actually a way to tell other than looking at the periodic table and identifying which column the atom is in and which spin that column correlates to in spin!

Claudia_Danysh_2B

Usually, you can know by identifying what the overall charge of the atom is!

Claudia_Danysh_2B

Hey guys, I get really confused when I'm thinking about trends in the periodic table and was wondering if anyone has any tricks/advice for making them easier to remember?

Claudia_Danysh_2B

Ya usually I fill in the dots by only putting one on each side and then going around a second time so you I the right number of paired and unpaired electrons!

Claudia_Danysh_2B

alebenavides wrote:is there a way to know if we've posted in a section already ?

I don't think there is!

Claudia_Danysh_2B

I think we do get points for every post we make. I don't think we can actually see how many points we have but ya I think if you only submitted three posts instead of 5 you would get partial credit but I'm not sure.

Claudia_Danysh_2B

Congrats!!!! :)

Claudia_Danysh_2B

Congrats!!!! :)

Claudia_Danysh_2B

Why can you never trust an atom?

Because they make up everything!

Claudia_Danysh_2B

This post has guided me during this quarter. I've been doing everything you said and I feel comfortable with the material and ready for the midterm!

Claudia_Danysh_2B

Thank you this actually saved me so much time!

Claudia_Danysh_2B

Doctor to patient: You're low on Magnesium
Me: 0mg

Claudia_Danysh_2B

Reading this post was so motivating for me because I also want to go to medical school. Thinking about the road to getting there is super intimidating and reading what you had to say made me realize that even though it's tough, its a long process that will prepare me for the future!

Claudia_Danysh_2B

Hi Marina! First, I want to say that everybody is also nervous to some extent and that you're not alone! :) One of the main things that helps me to not be so nervous is honestly to just study the material until I feel comfortable with it. One of the reasons why I get anxiety about school is that I f...

Claudia_Danysh_2B

Hey, my TA sent out an email this week saying that we can use our phone camera instead of having to use a separate webcam! I would probably reach out to your TA first though to make sure!

Claudia_Danysh_2B

Hi! So basically, I watch the lectures and then do the problems in discussion. If I realize I'm having trouble understanding a topic covered during a lecture or trouble answering a practice question from discussion section on my own, I either watch the lecture again or try to understand why we appro...

Claudia_Danysh_2B

Hi! So my understanding is that an electron is excited when it receives energy from an incoming photon and because of this is "excited," ultimately making the electron jump to a higher energy level. Sometimes, when this energy from an incoming photon is high enough, the electron is so &quo...

Claudia_Danysh_2B

Hey guys, I know Dr. Lavelle has been explaining how the law of conservation of mass connects to different topics we're covering but I'm struggling to connect it to when an electron is so excited that it ultimately ends up "disconnecting" from the nucleus of an atom. Does anyone have any i...

Claudia_Danysh_2B

Hey guys, I don't think this is something that we need to know but since different photons can make electrons jump to different energy levels that eventually end up returning to ground state, is there a correlation between the color of light that is emitted and the energy of the photon? I know this ...

Claudia_Danysh_2B

I don't think that there's a preference in which form you use. Either should be good in my opinion as long as you make sure that you're being careful when you're using that notation when doing calculations!

Claudia_Danysh_2B

I would also say that you should really only worry about sig figs when you're writing down your final answer. I keep every decimal that I can in between calculations since that helps me be more accurate and then once I'm at my answer, I make sure my final answer and the numbers used in the question ...

Claudia_Danysh_2B

Which units should we use when including temperature in a chem problem? My roommate said that the unit that you should use for temperature depends on the type of problem you're looking at, is that true?

Claudia_Danysh_2B

I also think that we pretend we have 100 grams in total because it makes the calculations easier because when you're first learning how to figure out empirical and molecular formulas, pretending that there are 100 grams in total just makes it easier to approach each problem since you start each prob...

Claudia_Danysh_2B

Since we know that mass is conserved in chemical reactions because of the Law of the Conservation of Mass, you can determine the amount of oxygen in combustion by looking at a balanced chemical equation that involves combustion and determining how many number of moles of oxygen there are to begin wi...

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