CHEMISTRY COMMUNITY

Jalaia Jackson 2G

I agree with the other comments, just practice remembering the common elements and you should be fine. Here's a link to a good review and practice. Hope this helps: https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Supplemental_Modules_(Analytical_Chemistry)/Electrochemistry/Redox_Chemist...

Jalaia Jackson 2G

Agreeing, with the above comments they will show you in the diagram, but just remember that the anode is usually on the left and the cathode is on the right, with the anode going through oxidation and the cathode reduction.

Jalaia Jackson 2G

I agree with the other comments, since the conversion is spontaneous it could happen at room temperature and 1 atm, but it would be a much slower process since the energy being absorbed is low.

Jalaia Jackson 2G

Yeah, if you have received 50 points you can still post, you just don't get any extra points since that category is capped at 50.

Jalaia Jackson 2G

The max is 50 points, but you are expected to post at least 5 times a week since there are 5 points per week multiplied by the 10 weeks, hence the total of 50 points.

Jalaia Jackson 2G

Yes, I believe we can use them interchangeably. In Friday's lecture when writing the equation Lavelle used redox, cell, and battery in the E (__potenial), so I'm assuming they represent the same idea.

Jalaia Jackson 2G

I think the purpose of the salt bridge is that it helps to maintain neutrality between the two sides of the circuit. It's to maintain a charge balance since the electrons are moving from one-half cell to the other. Without it, the ions can't flow between the cathode and anode freely.

Jalaia Jackson 2G

My favorite food is any kind of pasta or sandwich. I've really been into shrimp scampi lately, and also craving mint chocolate chip ice cream.

Jalaia Jackson 2G

Agreeing with the others, I think the battery is set up like this. When Prof. Lavelle told us about E cell= E (Right: cathode) - E (Left: Anode) in Friday's lecture. I think it will always be represented like this.

Jalaia Jackson 2G

Agreeing with the previous comments, E (cell potential) is not a state function because it is dependent on the path it takes, so it ends up being a path function.

Jalaia Jackson 2G

This isn't a dumb question at all. Enthalpy has to deal with heat, while entropy has to do with the state of a system. In more depth, enthalpy is the heat content of a system, and enthalpy changes when energy is either lost or gained. Entropy refers to the level of disorder of a system depending on ...

Jalaia Jackson 2G

Agreeing with most comments, I think the context of the question matters. If the question mentions Kelvins then you should convert like when dealing with entropy. I think it is a good habit to just convert to Kelvin, even if it is not specifically stated because most questions seemed to be formatted...

Jalaia Jackson 2G

This is very kind. I hope everyone that reads this post is also able to enjoy their weekend and have a happy Valentine's Day.

Jalaia Jackson 2G

If the problem does not directly state it, it might hint by writing "slow" or "quick" expansion or by talking about the type of pressure exerted on the system.

Jalaia Jackson 2G

Currently, I've rewatched Game of Thrones, but I have also been watching Queen's Gambit and Scandal. All three shows are fantastic.

Jalaia Jackson 2G

Just wanted to update:
I've been watching Vampire Diaries, The Walking Dead, Naruto, and Game of Thrones. I've been having a lot of fun watching them.

Jalaia Jackson 2G

Here's a link to a good website. I hope it helps.
https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_General_Chemistry_(Petrucci_et_al.)/16%3A_Acids_and_Bases/16.4%3A_Strong_Acids_and_Strong_Bases

Jalaia Jackson 2G

Agreeing with Karl, Prof. Lavelle mentioned this in Lecture # 12. The standard enthalpy of vaporization is linked to N or the # number of particles. When a system moves from liquid to gas, the molecules in the gaseous phase occupy more states compared to liquids or solids. This allows more possibili...

Jalaia Jackson 2G

I think the main difference is that thermal energy doesn't move and stays inside the system versus heat, which is the energy that can be transferred in and out of a system like with endothermic and exothermic processes.

Jalaia Jackson 2G

I agree with Andrew and Vince, I think it mainly depends on what is constant when looking at your system. You can also result in the same value too.

Jalaia Jackson 2G

Just like others have mentioned, the simplest example is the tire pressure example that Prof. Lavelle brought up. Adding air into the tire increases the compression within the tire, which puts work into the system allowing for a positive value for work. Sapling also mentions this on one of their que...

Jalaia Jackson 2G

Since the reaction is endothermic that means the system will take in heat. This will cause the reaction to shift right towards the products. Since the system is requiring more heat this will cause K to increase since the numerator will increase.

Jalaia Jackson 2G

It usually takes around a week, he also emails us to update how grading is going.

Jalaia Jackson 2G

If H2O is water and H2O2 is hydrogen peroxide, what is H2O4?

Drinking, bathing, and lots of other activities.

Jalaia Jackson 2G

Yes, you're correct. You can rearrange the equation, but like the other comments mentioned keep track of the sign changes of the enthalpy.

Jalaia Jackson 2G

The professor will send out an email when the grading is close to being finished. So, between a week or two, the grading should be inputted.

Jalaia Jackson 2G

Just as everyone else has mentioned, I don't believe there is a reset button. However, you could copy the question and reanswer them separately, and then check the answer using Sapling. That could be a good method.

Jalaia Jackson 2G

I believe it has to do with potential energy. Forming bonds releases energy because once they are formed the energy is no longer needed. It gets released which is why it is exothermic, compared to breaking bonds which requires energy.

Jalaia Jackson 2G

Agreeing with the post above, he sent out an email listing the specifics of what we should do. It should outline what you should be looking at.

Jalaia Jackson 2G

Speaking from experience, the midterm is much more like the textbook problems. However, Sapling is good at breaking down the solutions step-by-step. Hope this helps.

Jalaia Jackson 2G

Agreeing with everyone else, yes they refer to the same thing. Good question.

Jalaia Jackson 2G

I watched a video of a man touching lava, but very quickly, and yet he doesn't get burned. I looked it up and found out it is related to the Leidenfrost effect. Looking at the heating curve for water, how could we explain this effect?

Jalaia Jackson 2G

I remember on the post-assessment for module 4, one of the questions mentioned: "State whether the equilibrium will shift toward the products, reactants, or neither." ii. The pressure on the system is increased. The answer was neither. Why is that? I know a change in pressure doesn't chang...

Jalaia Jackson 2G

Thanks for asking this I had the same question. But, as everyone has mentioned it depends on what the question is asking for and which side the reaction will shift to. The question might say something like "1.50 mol PCl5 is placed..." and you have to look at the equation to see if it is th...

Jalaia Jackson 2G

I think looking at the topic title when clicking on someone's post or if you post might help you differentiate if it is 14A or 14B material. Also, the other post might be right, some people probably just posted in the wrong place. This has never happened to me so I don't have much knowledge of this ...

Jalaia Jackson 2G

The 5% rule is probably just a guideline. If it is less than 5% you can approximate, but if it is more that is when the quadratic equation comes in. We probably use this rule because anything under 5% is very small, so it doesn't make that much of a difference to the overall composition. For example...

Jalaia Jackson 2G

Just as everyone has mentioned, when there's an increase in pressure, the volume will decrease. When the volume decrease to tell if the reaction will shift either left or right, you have to look at the moles of gas on each side of the equation. If there are more moles on the left then the reaction f...

Jalaia Jackson 2G

I think stability implies that either the products or reactants are favored. The ratio of P/R is related to the energy difference of R and P. So, with stability depending on K it can tell you whether R or P is favored and the energy difference.

Jalaia Jackson 2G

I remember it was mentioned in lecture that chemical reactions adjust so as to minimize the effect of changes. What exactly does this mean, how do the reactions adjust themselves?

Jalaia Jackson 2G

Agreeing with others, I believe you look at the overall reaction even if you are only calculating Kc or Kp. So, you look at each phase in the entire reaction and that’s what determines if the equilibrium is homogeneous or heterogeneous.

Jalaia Jackson 2G

Is there anything else besides temperature that can make an equilibrium dynamic?

Jalaia Jackson 2G

Agreeing with what everyone else said, having both the products and reactants with equal concentrations at equilibrium is very difficult to produce. That’s probably why lavelle mentioned that.

Jalaia Jackson 2G

Here's a good image for simplification. I hope it helps.

Jalaia Jackson 2G

I think doing practice problems and just watching some videos will be good over the break. Don't overload yourself, remember you are on break.

Jalaia Jackson 2G

I feel like one way to stay motivated is to set a schedule for yourself and pace yourself. Write out everything you want to accomplish, so you can check it off as you go. Give yourself 15-30 minute breaks every two hours or so, so you don't get fatigued. Also, act like you're still going to class in...

Jalaia Jackson 2G

When classifying strong & weak acids, and strong & weak bases, I was curious when do we classify a compound as Other? Just like in the Sapling HW for example.

Jalaia Jackson 2G

When I was doing the Sapling HW on Sunday I found a really good picture that helped me. I hope it can help anyone that needs it.

Jalaia Jackson 2G

If anyone needs help naming coordination compounds I found this website extremely helpful:
http://www.chemistry.wustl.edu/~edudev/LabTutorials/naming_coord_comp.html

Jalaia Jackson 2G

As everyone else mentioned, you only need to add -ate, when the coordination complex has an overall negative charge. Here's a website link that I found was helpful. http://www.chemistry.wustl.edu/~edudev/LabTutorials/naming_coord_comp.html

Jalaia Jackson 2G

So as long as the dipole moments cancel out in a molecule it is considered nonpolar? I was thinking about this because I know bonds can be polar from differences in electronegativity, but based on the shape the molecule can still be nonpolar, right?

Jalaia Jackson 2G

How is a complex ion important for biological processes? Or is it important at all?

Jalaia Jackson 2G

How would you explain why lone pairs are more likely to be found in certain locations around a central atom? Thanks.

Jalaia Jackson 2G

How does everyone feel about the class so far? I feel like it is going well, there are some points where I could've done better. Does anyone feel the same?

Jalaia Jackson 2G

How does an even number lead to a coplanar on a molecule? Are coplanars important to molecule structure?

Jalaia Jackson 2G

Why are chemists so great at solving problems? Because they have all the solutions.

Why did the white bear dissolve in water? Because it was a polar bear.

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."

Jalaia Jackson 2G

Chapter 2: Yellow decides to follow Green. It was odd that Green would leave right as the reactor went off. Yellow thought to themselves, 'I better be careful, Green could be the Imposter.' You follow behind Green catching up with them in weapons. They're standing in front of the download data righ...

Jalaia Jackson 2G

I feel as though one way to make studying at home better is to: 1. Find an environment that suits you. 2. Mentally prepare and take care of yourself. 3. Plan out what you have to do, to keep yourself on track. 4. Write down anything you need clarification on, for any class. 5. Make time for office h...

Jalaia Jackson 2G

So in terms of Lewis structures, delocalized π bonds can only occur with resonance structures, or even if a molecule doesn't have a resonance structure can delocalized π bonds exist? I'm referring to the solution of question 16 on Sapling just for clarification.

Jalaia Jackson 2G

On one of the questions for Sapling, the solution mentioned that the most stable geometry is an arrangement that keeps the atoms or electrons bonded to the central atom as far apart as possible. Why is this true? Does it have something to do with electron-electron repulsion?

Jalaia Jackson 2G

As mentioned before you should have 35 posts and 50 by the end of the quarter. Make sure to check the dates to see how often you've been posting per week.

Jalaia Jackson 2G

For Lewis structures, the octet rule can be violated by elements that use the d-orbitals found in the third principal energy level and greater (n=3...5, 6). S, P, Si, and Cl are some examples of elements that form an expanded octet.

Jalaia Jackson 2G

Nane Onanyan 1H wrote:Learning the choreo for "I Cant Stop Me" by twice B)

That's amazing. Twice's choreos are always fun to learn. Hope you have fun.

Jalaia Jackson 2G

Recently, I've been really into doing yoga. I feel like it is really good to stretch out your body in the morning before sitting in front of a computer screen all day, lol.

Jalaia Jackson 2G

Like everyone else has mentioned, if you ever want to check your grades you can go to my.ucla.edu and go under the Classes tab to find grades and transcripts.

Jalaia Jackson 2G

I know Sapling Question.9 asks, "What is the oxidation number of chlorine in the perchlorate ion?" How do I approach this question? Also, has Lavelle talked about oxidation numbers yet?

Jalaia Jackson 2G

I've mostly been practicing using textbook problems and going through the Sapling explanations again. This has been the most helpful for me. Also, since this section is more conceptual try to explain the problems to yourself before you solve/approach them, that might be helpful.

Jalaia Jackson 2G

What was Avogadro’s favorite sport?
-Golf, because he always got a mole-in-one.

Jalaia Jackson 2G

Which would release more energy, an intermolecular/interionic interaction or an intramolecular bond when broken?

Jalaia Jackson 2G

I know for me I had trouble identifying Lewis acids and bases. Especially for Sapling problem # 6. I found this picture to be helpful as well as writing out the Lewis structures.

Jalaia Jackson 2G

This is so cool. Thanks for putting this together.

Jalaia Jackson 2G

Hi guys, I am back once more for some chemistry fun. This week I wanted to do Among Us, where I let you pick choices, and then the next day I respond with the next chapter/choice. Have fun. Chapter 1: The Missing Valence The clock reads 8:35 AM. You are Yellow, tasked with checking that all the val...

Jalaia Jackson 2G

I 100% recommend watching the vampire diaries, gossip girl,new girl, young and hungry, and honestly I have so many more suggestions!! hmu if you need more ideas :) Your taste is amazing. I just finished binge-watching Vampire Diaries and The Originals too. Absolutely 10/10. I also started watching ...

Jalaia Jackson 2G

Hello! First off, I've watched a LOT of the recommendations above + I would say all of them are really good! Second, I just wanted to add a recommendation of my own, especially if you like crime/forensics. It's called Bones, and I think it's on Hulu (?) Feel free to let me know what you think! Yes,...

Jalaia Jackson 2G

Like, everyone else has mentioned a hydrogen bond occurs when a highly electronegative N, O, or F atom shares a lone pair of electrons with an electron-deficient H atom. O---H---O for example, like #14 on Sapling.

Jalaia Jackson 2G

Hi guys, I am back once more for some chemistry fun. This week I wanted to do Among Us, where I let you pick choices, and then the next day I respond with the next chapter/choice. Have fun. Chapter 2 is live scroll down to see it and leave your replies!!!! Chapter 3 is LIVEEEE! Scroll down and leave...

Jalaia Jackson 2G

I love revisiting my childhood by watching all of my past favorite television shows. Furthermore, I find this so interesting as I am able to see the show from a different perspective than I did as a 6th grader in middle school. This allows me to understand parts of the show that I never was able to...

Jalaia Jackson 2G

Why is a molecule with several resonance structures, more stable than one with fewer? Does it have something to do with the ability to change where the bonds are placed or the delocalization of electrons?

Jalaia Jackson 2G

When calculating the formal charge, is it more favorable for any charges to be on the more electronegative atoms? Also, why do we not want our central atom to have a charge? Thanks.

Jalaia Jackson 2G

How does the size and shape of a molecule limit the number of hydrogen bonds formed? I was thinking about this from the Sapling question about the Urea molecule.

Jalaia Jackson 2G

I would assume by Sunday night, they mean 11:59 pm Sunday. Especially, because it says "Sunday at Midnight."

Jalaia Jackson 2G

I also found a picture that assisted me. Hopefully, it can help a bit.

: 2yVtmDMPT5ORfR49I4nL_q-20numbers.png (10.49 KiB) Viewed 66 times

Jalaia Jackson 2G

Hey, everyone. I was wondering what are some good show recommendations to watch or some of your favorite childhood shows. Recently, I have watched Castlevania 10/10, and when I was younger I loved Total Drama Island, also a 10/10.

Jalaia Jackson 2G

This is how I remembered it: The Lyman series corresponds to UV light and the electrons rest at the energy level n=1. While the Balmer series corresponds to visible light and the electron's rest at the energy level n=2.

Jalaia Jackson 2G

How does electron repulsion contribute to the increase or decrease of the radius size? Thank you.

Jalaia Jackson 2G

Are we going to be asked questions like “What series would this transition belong to?” On the midterm or is this something I shouldn’t worry about?

Jalaia Jackson 2G

What do you guys like to do to relax when not doing work? I usually watch Netflix, play with my dog, or play video games.

Jalaia Jackson 2G

During one of the review sessions someone said something that peeked my interest. Is it true that N1 is initial if it’s absorption and final if it is emission?Because in the textbook it is written as 1/n1 first.

Jalaia Jackson 2G

Wow, I never really thought of this. Sometimes when solving the equations I just plug in the numbers and add the units at the end. This is very helpful, thank you.

Jalaia Jackson 2G

What are the additional factors that effect the e- energy electrostatic potential energy in Multi-Electron Atoms? I know Lavelle mentioned it in his slides, but I don’t think I have a full grasp of the concept.

Jalaia Jackson 2G

Just like everyone has mentioned above frequency and wavelength have an inverse relationship. When you want to increase the frequency the wavelength will decrease, while if the frequency decreases the wavelength will grow bigger. The difference in wavelengths is how you determine the types of waves ...

Jalaia Jackson 2G

For the future would it be good to know how to write the formula of a molecule when just given the name such as, disulfur dichloride or sulfuric acid?

Jalaia Jackson 2G

I was looking at one of the module problems #17, the one that mentions one hundredth of the speed of light and was confused on where does speed fit into Heisenberg’s equation.

Jalaia Jackson 2G

So when the mass of an object is presented as grams or kilograms in a problem, how do we determine in a form such as ( 1.93 x 10^n), what the exponent will be. I feel like sometimes I am using the wrong exponent when converting numbers in the questions. Thanks.

Jalaia Jackson 2G

So based on my understanding, do only atomic sized things have wavelike properties. Because I recall on Prof. Lavelle’s lecture he said any moving particle with momentum has wavelike properties. Thanks.

Jalaia Jackson 2G

From my understanding of significant figures pay attention to the leading zeros and trailing zeros. Leading zeros would be 0.00785 so the zeros to the left after the decimal wouldn’t count so the answer would only have 3 significant figures. For trailing significant figures it would be like 876000 t...

Jalaia Jackson 2G

How wide is the spectrum of frequencies that the sun emits? I know the professor mentioned, gamma and ultraviolet, but does the sun encompass all know waves the in electromagnetic spectrum?

Jalaia Jackson 2G

I was watching one of the modules, the Photoelectric Effect one and was curious if we would need to memorize the formulas or will they be given us to use on the midterms? Also, would it be helpful to memorize some of the formulas in general?

Jalaia Jackson 2G

Based on Lavelle's example of water in an experiment with a dial, I was curious that based on this metaphorical experiment does that mean that Classical and Quantum mechanics can both operate at the same time/space, and just Quantum mechanics is "activated" on a molecular scale? Thank you ...

Jalaia Jackson 2G

Agreeing with the other comments, I don’t think you should be worried about memorizing the table. I do think it is good advice to try and remember some of the most common element’s atomic number and mass just to make it easier during tests, so you won’t have to spend time looking for them.

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