CHEMISTRY COMMUNITY

Tam Nguyen 2B

Since our final happened pretty early in the week, the grades should be out soon after final week ends.

Tam Nguyen 2B

Yes I'm pretty sure that's correct. For elementary reactions, rate law will correspond to the reaction exponents which means their coefficients in the reaction.

Tam Nguyen 2B

It doesn't always appear as a reactant I think. There are times where it can show in a middle step, but if it were to show up in a problem for our test, I think Lavelle would make it appear as a reactant in the first step so we don't lose our minds and can more easily distinguish catalysts from inte...

Tam Nguyen 2B

I follow the Daily Bruin and I suggest you guys should too since they try to provide information for the students as things get announced. They're going to let students have doubles at least for now in the fall, it could be subject to change of course. I'm planning on dorming because hopefully by th...

Tam Nguyen 2B

Just make sure to keep the anodes on the left and the cathodes on the right, otherwise the order that of which you put the molecules in doesn't really matter.

Tam Nguyen 2B

If you want to be efficient, do practice on the stuff that you don't feel as confident in. However, you should keep in mind that a majority of the test is going to be on thermodynamics and thermochemistry since that is what we spent the most time on. If you've got at least one day to cram, try your ...

Tam Nguyen 2B

I'm pretty sure if you email some of the UAs asking for their worksheets they'll be willing to send them to you. During their sessions they provide really good examples to use so that you can learn and get the hang of them.

Tam Nguyen 2B

Isochoric or constant volume means the size isn't changing at all, there isn't any getting bigger or smaller. So, there is no work to be done as nothing is happening with the size.

Tam Nguyen 2B

I think it will be most of the former and possibly a little bit of the latter. In discussion with my TA, he said that he does not know how exactly Lavelle would create a question that would require you to derive the other equations from the unique ones, but we should still keep it in mind and review...

Tam Nguyen 2B

Going outside for me has always been a good reliever from burnout. Whenever I feel like I want to just headslam into my desk from working, I grab my dog and do an hour and a half walk while listening to music to just get my mind off of stress. Once I come back, I'm a lot more relaxed. So maybe this ...

Tam Nguyen 2B

If you're into reading thrillers, The Night Bird by Brian Freeman was pretty exciting and adrenaline inducing for a succinct novel.

Tam Nguyen 2B

Sleeping, watching korean dramas, and playing games with friends online are the primary ways I see myself relaxing during the week off. The chance to just turn my brain off for a bit is really what's pulling me through the rest of the quarter.

Tam Nguyen 2B

Even if you dont finish it all by the due date, still complete it. Sapling still gives partial credit for getting all of the questions done.

Tam Nguyen 2B

That it does, but luckily sig figs are not the biggest deal since they don't test on it.

Tam Nguyen 2B

Since I'm an Anthro major I'm taking the beginning anthro courses anyway. They're pretty easygoing on coursework and the information isn't difficult to understand.

Tam Nguyen 2B

Definitely going out on walks with my dogs is the main medium of exercising for myself. However, I did go play paintball (under adequate conditions) with some friends and that was quite the more rigorous activity that I've done in a fat minute.

Tam Nguyen 2B

I was definitely unprepared for the sheer amount of concept questions going into midterm 2 which was disappointing because that reflected in my score. I'm hoping that the final will be more of what I anticipate instead of a surprise.

Tam Nguyen 2B

I'm big on burritos and tacos for sure, but I do love me a plate of fried taro with eggs (sounds weird but it's delicious).

Tam Nguyen 2B

The anode is usually the positive side, while the cathode is negative. Therefore the cathode will usually be the electron donor.

Tam Nguyen 2B

When the reaction quotient (Q) is greater than your equilibrium constant(K), the reaction will favor the reactants. When Q is less than K, the reaction will favor the products. I try to remember it by the way the mouth (>/<) faces in the greater than/less than signs. Whichever way the mouth faces (>...

Tam Nguyen 2B

You calibrate the calorimeter to get its heat capacity. So when the reaction raises the temperature of the calorimeter, you can multiply the change in temperature with the heat capacity to get heat of the calorimeter, which in turn will give you the heat released by the reaction.

Tam Nguyen 2B

I'm doing Cluster 73C, Chem 14BL, and English 91C. I was hoping on getting into 14C but the classes filled up too quickly.

Tam Nguyen 2B

The question is referring to their entropy values. The most ordered are going to have the lowest entropy values while the least ordered will have higher entropy.

Tam Nguyen 2B

Im so nervous about this upcoming midterm because first off, I don't even know when it is, and then I have so much material to catch up on lol. We'll se how things go. The midterm is going to be on Friday at the lecture time that you're signed up for. I'm also pretty but hopefully if we work hard e...

Tam Nguyen 2B

Adiabatic means there is no heat in the system. This entails that q = 0. Since internal energy is calculated from heat + work, the only variable left is work. Therefore, adiabatic systems' internal energy are going to be work dependent.

Tam Nguyen 2B

A super helpful way to see what went wrong on your midterm would be going to the midterm reviews that the TAs offer. They let you see specifically what you got wrong and what you should look out for the next midterm. Also going to UA sessions or TA office hours is a good way to reinforce the princip...

Tam Nguyen 2B

It's supposed to be useful to see whether a reaction will occur naturally by itself or will it need work to make it happen.

Tam Nguyen 2B

From Dr. Lavelle's explanations, q and w are dependent on the path taken to get there. Like how the ways to calculate the work or heat change based on the conditions and what properties you have. However, internal energy is only dependent on the state of the system. It is not path dependent like how...

Tam Nguyen 2B

For #10 I'm pretty sure you do put a negative in front for the water. You're right in the fact that since water is losing heat, the sign given for its value is negative.

Tam Nguyen 2B

You can look at "Your Posts" under the quick links to see how many posts you've made. If you want to look at them from a certain range of time, at the bottom of the page there will be an option where you can choose to look at posts you've made for either the past week, 2 weeks, month, year...

Tam Nguyen 2B

Set the qice equation and qwater equation equal to one another, but don't forget to include fusion enthalpy to the qice side since it is melting. Once you set them equal to one another, just distribute the values carefully into the parentheses, then add and subtract from the sides until you get Tf o...

Tam Nguyen 2B

I would have to say Guardian: The Lonely and Great (aka Goblin) is my absolute favorite of all time to this day. I think overall from soundtrack, acting, sets, and cinematography it is definitely superior. However, if you are detracted by age differences (which would be unfortunate), then I do not r...

Tam Nguyen 2B

I definitely had to give myself a pick me up after having a midterm like that on Friday, I'm glad to see other students doing what they can to get better since sometimes I'm worried everyone is just really good and I'm the only one having a tough time.

Tam Nguyen 2B

I don't think they're going to grade it super soon despite all of us taking it on the same day since they're also taking into account partial credit answers which will probably make the process take longer.

Tam Nguyen 2B

I tend to go towards more Asian artists so I'm normally listening to Sam Kim, NIKI, Sorbet by Galdive, and BIBI

Tam Nguyen 2B

Is the equilibrium constant. It's a little confusing I suppose when the textbook starts using K, Kc, or Kp interchangeably. However, Kc is more indicative of concentration while p is more specific towards pressure. And K is their general term.

Tam Nguyen 2B

I'm planning on taking Chem 14BL once we get into spring with 14C, I'm pretty sure there are others with similar ideas of doing so as well.

Tam Nguyen 2B

Observing the conjugates of the salts will indicate whether it's acidic or basic

Tam Nguyen 2B

If possible also try to either explain how you're solving problems or your solutions step by step to yourself because I find that it helps solidify the concepts easier. Repetition also makes me less nervous. If you have another student that you can talk to while solving problems that would make it b...

Tam Nguyen 2B

You can also find the list of UA sessions on Dr. Lavelle's website under the 14B section if you need it again in the future.

Tam Nguyen 2B

Probably remember that combustion reactions are going to be exothermic. So in the case of starting a car, that involves the combustion of fuel and would thus be an exothermic reaction. I don't know if this would work all the time, but any reactions that generates heat in the surroundings that we can...

Tam Nguyen 2B

The value is important because the concentrations of H30+ and OH- are what combine to give the Kw. The Kw is its own value of 1 x 10^-14 at 25° C. So H30+ and OH- both have to be even values for them to equate to Kw.

Tam Nguyen 2B

That is because Ka + Kb together = Kw. Kw has a set value of 1 x 10^-14 at 25° C, so regardless of how either Ka or Kb change, the other has to accommodate to achieve the equilibrium value.

Tam Nguyen 2B

There are multiple definitions to acids and bases because they have different properties. As long as you remember the Arrhenius, Bronsted-Lowry, and Lewis definitions in any sort of combination, you'll be able to distinguish acids and bases.

Tam Nguyen 2B

I'm pretty sure they're trying to engineer it so that we take the exams during lecture time.

Tam Nguyen 2B

If you can, find someone that you can talk to as you solve problems and try to explain the processes to each other. The best way that I've found to really solidify my understanding is if I work through a problem and say what I am doing and why I am doing it as I solve.

Tam Nguyen 2B

My comfort movie is definitely Anastasia because the music is super catchy and Harry Potter movies mainly 1-4 because the later ones are the more serious ones.

Tam Nguyen 2B

It would still be a good idea to do them, they're just optional though

Tam Nguyen 2B

You find Q the same way as constant K, you're just doing it under the assumption that the reaction is not at equilibrium instead.

Tam Nguyen 2B

It's due next week my dude. I'm pretty sure he's giving some kids time to get their sapling code because it takes a while to get sent.

Tam Nguyen 2B

The specific K depends on the question and the information given. Kc is concentration and Kp is partial pressure. I'm pretty sure the questions that we will be given will indicate which one they're asking for. Like if the question asks for molars then they want Kc, if they ask for atms or barr then ...

Tam Nguyen 2B

Honestly one of my resolutions is doing more studying for this class because I didn't do so hot during fall quarter on the final. Other resolutions I have is maybe making more friends in my classes because freshman year is supposed to be all about making friends and stuff.

Tam Nguyen 2B

Lavelle sent an email saying that the grades for the students should be calculated by Saturday.

Tam Nguyen 2B

Thank you to Dr. Lavelle for providing an easygoing atmosphere for learning chemistry. I'm not really all that enthusiastic about chemistry myself, but I'm glad you didn't make chemistry a taxing experience to learn. I am especially grateful to the music and the puns you would scatter in your presen...

Tam Nguyen 2B

I remember all of them in the order as Br I N Cl H O F, altogether they sound like Brinkelhoff.

Tam Nguyen 2B

Water is amphoteric, so it can act as both.

Tam Nguyen 2B

I'd definitely recommend getting a friend who you can either study with or talk to in general about school stuff. They don't have to be another UCLA student, but having that friend who you can relate to on any struggles or tell your achievements to is definitely very motivating. Accountability is a ...

Tam Nguyen 2B

I do not think there is a curve for this class, I don't recall any mention of it in the syllabus.

Tam Nguyen 2B

It's probably going to take a while for them to go through the tests so realistically, I'd say at least a week after.

Tam Nguyen 2B

Make sure you identify the transition metal and how many ions are going to be bonded to it inside of the brackets, that will tell you your coordination number.

Tam Nguyen 2B

It's kind of hard to visualize without a picture, but a sigma bond would be in between the pi bonds of a double or triple bond.

Tam Nguyen 2B

I'm probably going to either spend a lot of time watching dumb Christmas movies with my family or go on calls with my friends while we play games.

Tam Nguyen 2B

The -3 is to indicate the additional electrons and the formal charge of the overall molecule. The most stable structure of AsO4 3- is in the form of a tetrahedral. Although the bonds are polar, all the oxygens are equidistant from each other and have resonance, meaning that the compound itself is no...

Tam Nguyen 2B

My family went for steak and ham along with some potato salad for our meal. I had a quaint friendsgiving with a couple of friends and we had a surf and turf dinner finished off with some pie. One of my friends literally drove to Julian to get the pie and we live in San Diego so that was kind of craz...

Tam Nguyen 2B

This is the one that my TA referred to my discussion

Tam Nguyen 2B

The equatorial atoms are going to form 120 degree bond angles between each other, while the angle between the equatorial atom and axial atom will be 90 degrees.

Tam Nguyen 2B

A 90 degree angle is a perfect right angle. A 120 degree angle looks a lot wider and more open in comparison.

Tam Nguyen 2B

Yes if there's resonance structures, then those pi bonds are delocalized.

Tam Nguyen 2B

That is correct, if you count the number of electron regions (lone pairs and atoms bonded to the atom in question) you can determine the hybridization number. It's actually a simple trick. 2 electron regions = sp 3 = sp2 4 = sp3 and so on For example, oxygen in H20 has a hybridization of sp3 because...

Tam Nguyen 2B

A delocalized pi bond correlates to resonance structures. A pi bond is a regular pi bond because the molecular structure that is drawn only has that one assemblage for it. Delocalization occurs because there are multiple possible resonance structures for that molecule that are affecting the true ove...

Tam Nguyen 2B

The last one, CCl4 is nonpolar. It has a symmetric tetrahedral shape, so its dipoles cancel out one another. That's why it is only London Dispersion and would not be listed for dipole-dipole IMFs as they are cancelled out.

Tam Nguyen 2B

The main reason why AsF3 has a higher boiling point than AsF5 is because AsF3 has dipole-dipole IMFs due to the bonds being covalent. Whereas AsF5 has only London Dispersion IMFS because it is a nonpolar molecule. If you draw it out you'd be able to kind of tell the molecular shape and derive the ki...

Tam Nguyen 2B

Covalent character in an ionic bond is when either an ion has high polarizing power or high polarizability. There is more covalent character in an ionic bond if the cation is small because its polarizing power is bigger, due to the concentration of positive charge being in a smaller area. So for exa...

Tam Nguyen 2B

There is electron repulsion present in atoms with lone pairs or bonded pairs. The electron repulsion is strongest between lone pair electrons and the least amount of electron repulsion is present between bonding pairs.

Tam Nguyen 2B

They're asking you to just list what IMFs are present in each of the molecules. All of them will have London Dispersion of course. So the best way of identifying any other ones would be drawing their lewis structures because you'll be able to see how/which atoms are bonded together.

Tam Nguyen 2B

I mean as long as you're on this site that has a bunch of answers to any question you can ask, I hope most of your worries can be assuaged. The last midterm was actually a lot more straightforward than I thought it would be. Conceptual questions weren't that hard to understand at least for me. Altho...

Tam Nguyen 2B

What the question wants you to see by looking at their lewis structures, is they also want you to understand what intermolecular forces are at work in the bonds when you draw them out. For part b, there's dipole-dipole happening in the diethyl ether, but in butanol it's not just dipole-dipole. There...

Tam Nguyen 2B

It's not a requirement but it does make things easier to memorize certain polyatomic ions because they are usually used in questions a lot. The main ones that are used in tests that I had to memorize in high school were ammonium, acetate, carbonate, phosphate, hydroxide, sulfate, sulfite, nitrate, n...

Tam Nguyen 2B

Just keep a relative idea on what the periodic trends are. Based on the concept questions that Lavelle put in the last midterm, they're pretty straightforward. This is probably to reduce confusion on the test and make it easier to grade.

Tam Nguyen 2B

Cations usually occupy the left side of the periodic table, all of the alkalis, because they easily lose their electrons. The anions are closer to the right side where all of the nonmetals are. The electronegativity is affected by this because it increases as elements move to the right where the non...

Tam Nguyen 2B

I was wondering if anyone knew if any of the questions from Midterm 1 were going to be discounted or if our score now is the permanent score. I'm pretty sure our scores are going to be permanent. Professor Lavelle and the TAs spent a while going over questions before distributing our grades to make...

Tam Nguyen 2B

The lewis acid will accept electrons while the lewis base will donate the electrons.

Tam Nguyen 2B

Yeah I agree, as long as you keep your total points above 450 you should be pretty solid for getting an A.

Tam Nguyen 2B

I've found it really helpful to go to a bunch of step up sessions to better understand concepts and to see what previous exam questions look like since the UAs will have some on their worksheets.

Tam Nguyen 2B

Yeah Professor Lavelle sent an email saying we had an 86% average and a 5% boost for installing respondus. Which overall is a pretty decent average.

Tam Nguyen 2B

I think it's because the electrons have to fill in all of the spaces of the 3d orbital before they can move on to the 4s orbital. The 4s orbital is in the next energy level.

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