CHEMISTRY COMMUNITY

Michelle Nguyen 3F

I'm gonna be honest I really enjoyed reading most of y'all's answers because throughout the quarter it's been difficult dealing with burnout, and I feel like the burnout from fall quarter carried over personally, so it just feel like no matter what I did, I couldn't get rid of it. I'm going to try s...

Michelle Nguyen 3F

Organic Chemistry Tutor seems to work well for most people, I might have to try watching a video or two!

Michelle Nguyen 3F

Hi! I am in a few, but I feel like I barely do much in them which makes me feel bad. I do try to go to socials through Zoom from time to time so that I don't feel completely lost once I actually go onto campus! I hope this helped. :)

Michelle Nguyen 3F

Hi! Winter quarter definitely struck harder than I thought it would have, but I'm just hanging in there, hoping that I can actually be able to change my pessimism of the final coming up. Thank you for asking! I hope you're doing good right now :) Good luck on finals!

Michelle Nguyen 3F

When you reverse an equation, K becomes 1/K!

Michelle Nguyen 3F

Honestly, I came in here wanting to do pre-med. I think it is very manageable, but just make sure you know how to use your time because classes can be time consuming and difficult at times. I hope you're doing well!

Michelle Nguyen 3F

I've had a craving for mi quan lately!

Michelle Nguyen 3F

The final is on Sunday, March 14th, at 9:30 AM - 11:00 AM. Good luck to everyone! :)

Michelle Nguyen 3F

Wasila Sun 2I wrote:Under what circumstances can we use the delta U=delta H+ w equation? Like what allows delta H to be interchangeable with q?

This can be used when the process is under constant pressure.

Michelle Nguyen 3F

Hello! Enthalpy is the measure of total heat present in the thermodynamic system where the pressure is constant. Entropy is the measure of disorder in a thermodynamic system.

Michelle Nguyen 3F

An isolated system just means that matter and energy cannot be exchanged with the surroundings. That being said, we can still make changes to the system. For example, in a bomb calorimeter we observe combustion reactions. Though it’s not exchanging heat with the surroundings, it is still exchanging...

Michelle Nguyen 3F

This quarter has definitely been tough on me, the upcoming break will definitely be much appreciated! Good luck to you :)

Michelle Nguyen 3F

K is the equilibrium constant of a reaction while Q is the reaction quotient that can be found at any point of the reaction and will help you determine if the reaction is getting closer to equilibrium.

Michelle Nguyen 3F

Now we’re making bad chemistry jokes because all the good ones Argon

Michelle Nguyen 3F

I wanted to write thank you on here! I keep re-reading this post because it helps me gain back motivation when I feel too defeated and scared about the future as a pre-med student. It’s been a lot of refreshing this page, but hopefully I can get through it!

Michelle Nguyen 3F

Yes, phases matter in Hess’s Law! It takes energy to go from one phase to another

Michelle Nguyen 3F

Write out the units of the problem from the given measurements or data recorded! Depending on which units you have, you can use the right R for the problem :)

Michelle Nguyen 3F

Yes, but it does depend on the solvent! Generally, solids and liquids do not have a significant enough change in concentration or pressure to be measured for the equilibrium in general

Michelle Nguyen 3F

Spring Quarter Lavelle isn't teaching for Chem 14C :-(

Michelle Nguyen 3F

Yes, it only applies to gases because solids and liquids do not have a significant enough change in concentration or pressure to be measured for the equilibrium in general

Michelle Nguyen 3F

The Second Law of Thermodynamics is that a spontaneous change is accompanied by an increase in the total entropy of the system and its surroundings.

Michelle Nguyen 3F

The best thing would be to memorize all of the strong acids and strong bases (roughly there 6-8 strong bases and 7 strong acids). Consider anything that is not among the list of strong acids and strong bases as weak acids and bases.

Michelle Nguyen 3F

Extensive properties are those that depends on the amount of substance, such as mass and volume. Intensive properties are those that do not depend on how much material is present, such as temperature and specific heat capacity. State functions are properties of a substance that is independent of how...

Michelle Nguyen 3F

I’m debating majorly, so please help me out if you read this!!! I’m still having a difficult time figuring which path to take right now (reference: my major is MIMG) first route: Asian American Studies 10, Chem 14C, Physics 5A second route: Asian American Studies 10, Chem 14C, Chem 14BL As much as I...

Michelle Nguyen 3F

K is a ratio (and a constant overall), so it will not have units!! Also, all the units of concentration or pressure will be cancelled out when you solve for K

Michelle Nguyen 3F

I’m also worried. I feel like I’ve done and keep doing so much, but it could only get me so far :/ The material still feels fuzzy to me, and my progress of understanding is slower than usual. Hopefully we can all power through this week and we do well :’) I wish you the best of luck for your study e...

Michelle Nguyen 3F

Yes, it is safe to assume so!! :)

Michelle Nguyen 3F

Yes!! Endergonic and exergonic refer to Gibbs Free Energy while endothermic and exothermic refer to enthalpy.

Michelle Nguyen 3F

Honestly, I am struggling a bit with time management. Along with a part-time job, I signed up for so much this year but I end up getting extremely Zoom fatigued at the end of the day. I do manage, however, by just requesting days off whenever necessary. This is especially for when I have a big midte...

Michelle Nguyen 3F

Hello! It depends on what your friend likes, but here, have this giant list I compiled over the years that exposes how much of a kdrama nerd I am (I will bold the ones I remember really enjoying; any unbolded ones are good too! otherwise I wouldn't have watched them). Unfortunately, haven't been ab...

Michelle Nguyen 3F

Hess's Law is that the overall reaction is the sum of the reaction enthalpies of the steps into which the reaction can be divided. This applies even if the intermediate reactions or the overall reaction cannot actually be carries out.

Michelle Nguyen 3F

You can make x negligible anytime that the equilibrium constant, K, is less than 10^-4, regardless of whether it is a quadratic, cube, etc.

Michelle Nguyen 3F

Yes, you solve for Kc and Kp in the same way! Kc is for concentrations and Kp is for partial pressures. In terms of conversion, sometimes it would be helpful to use the Ideal Gas Law!

Michelle Nguyen 3F

Lofi is great study music!! Casually I’ll just listen to JOJI, Lauv, Keshi, Khai Dreams, SZA, Niki, and some kpop or krnb.

Michelle Nguyen 3F

This is because the conversion from Celsius to Kelvin is
(temp in Kelvin) = (temp in Celsius) + 273.15, so the only difference between Celsius and Kelvin is the 273.15. Aside from that, a change in 1°C = a change of 1K.

Michelle Nguyen 3F

As condensation occurs, energy is released and comes in contact with our skin which causes the burn. The high enthalpy measured from the steam as molecules begin to release energy and change their form creates a hot environment. When our skin comes relatively close to the site where molecules are c...

Michelle Nguyen 3F

Congratulations!!! I’m very proud of all of us :’)

Michelle Nguyen 3F

After the midterm, I just ate a snack I liked and took a short nap since I haven’t been able to sleep much as of recently. Good luck with the midterm, and you did it! I hope you also treated yourself well :)

Michelle Nguyen 3F

Kelvin is the units used in the ideal gas law!

Michelle Nguyen 3F

I honestly keep re-reading this post as a reminder for motivation and that it's okay that I still don't know what exactly I want to do yet. Thank you so much for this, it really is appreciated! :)

Michelle Nguyen 3F

Did you know that you can cool yourself to -273.15 degrees Celsius and still be 0K?

Michelle Nguyen 3F

I usually do the practice problems in the textbook! And I usually do the ones I get wrong twice or do another problem not assigned, but has a similar way of solving so that I can understand the concept and methods of reasoning and solving the problem, better.

Michelle Nguyen 3F

Hi, I've never taken an exam with Lavelle before, how does proctoring and live monitoring work? From the computer, there will be a lockdown browser for taking the exam itself. Proctoring will be done by having your phone as an external camera for the TA to monitor your surroundings so that it’s ver...

Michelle Nguyen 3F

Hi there! I had Dr. Lavelle during Chem 14A, and it seems that the class structure for his 14A and 14B is very similar. Taking my struggles and mistakes from Chem 14A and transferring them to better study habits here, I would say my biggest tips are to keep up with the textbook reading and attend mo...

Michelle Nguyen 3F

Hi! For the homework, significant figures do not matter as much, but it is important to know them. :) For the exams, they were all multiple choice and all answers were very different from one another so that you do not need to worry about sig figs. Hope this helps!

Michelle Nguyen 3F

Lindsey_Su_3A wrote:Does anyone know how long the midterms will be?

Midterms are 50 minutes long each, and the final takes 90 minutes! It is also in the syllabus :)

Michelle Nguyen 3F

For me, it would be any Disney movie, but specifically either Mulan or the Lion King. All of the Disney movies have important lessons and values, but those two specific movies just draw to me the most!

Michelle Nguyen 3F

Hello! I have never taken a proctored online exam before and this is my first time taking Dr. Lavelle's class. Any insight on how they work and tips would be greatly appreciated! Thank you! Hi! Midterms and finals are proctor with a lockdown browser and using your phone as an external camera to go ...

Michelle Nguyen 3F

For ideal gas law, use Kelvin!

Michelle Nguyen 3F

I’m out of chemistry jokes, so I think I should ZINC of a new one

Michelle Nguyen 3F

I recommend making time to go to UA sessions, as they were pretty helpful! Also doing the outlines and all the exercise programs will help you prepare for the final pretty well

Michelle Nguyen 3F

Sapling is required! In the past, I believe it wasn't, but now it is. You buy the bundle that Lavelle has up on the site, it's around $70ish dollars I believe for multiterm access. It gives you access to the ebook and other resources. Sapling is also where you do the homework which I believe is wor...

Michelle Nguyen 3F

I think lengths just vary depending on the molecule, but that is an interesting coincidence!

Michelle Nguyen 3F

I would say mine would be to sleep early, and stop listening to any music 45 minutes before the test starts!

Michelle Nguyen 3F

Finals will be cumulative! Good luck to everyone, and you got this!! :)

Michelle Nguyen 3F

To stay focused, I usually study in a room that doesn't have my phone by my side. Even if I turn it off, if I am in the same room as my phone, I can just grab it and turn it back on and get distracted! I also study in a quiet environment and make sure that I do not have clutter in my surroundings!

Michelle Nguyen 3F

Personally, I simply read the textbook (sort of skimming) and I focus on the problems in the sapling! There's no definite way to study for finals as long as you understand the material. :)

Michelle Nguyen 3F

Honestly, I feel relieved but at the same time, the fact that I know I could've done better just still there and it kind of makes me feel :/ However, I am still overall pretty happy with how I'm doing overall. :) Hey, you got this! There's a lot of resources there to help out, but also remember to t...

Michelle Nguyen 3F

Hi! I think a lot of us are in the same boat, and probably even a bit more stressed now that it is close to finals now. :( I just want to say that you got this! There's still some time to study before finals, and you will do great!! :)

Michelle Nguyen 3F

Hi there! It's only been a quarter, but there's honestly no problem with switching your major at anytime (as long as you have enough time to finish your lower divisions and upper divisions). Just make sure to pursue something that aligns with your interests and that you are healthy and taking care o...

Michelle Nguyen 3F

Honestly, I feel a little bit under pressure because I realize I might have taken on more work than I can actually handle. I like to keep myself busy, but this time it's a lot :/ Overall, however, I feel content with everything going on, and I always try to keep up and manage, which is progress and ...

Michelle Nguyen 3F

You can go to your TA's office hours to talk about the midterm for review!

Michelle Nguyen 3F

We don't have to memorize them!! Information will be given our whenever needed, but it's still good if we could recognize a couple like nitrite or nitrate. :)

Michelle Nguyen 3F

It means "proportional to" ! In some of the example equations in the textbook, the sign shows up often. Hope this helps. :)

Michelle Nguyen 3F

This was a great read for some advice not just for chemistry class, but for classes overall! Thank you so much. :) Time management has probably been the most difficult thing due to the remote transition, but with the resources in the class, I think it is manageable!!!

Michelle Nguyen 3F

This was such a good read for me! Although I am in pre-med, I am very conflicted with my decision, so it's nice to know and have the reassurance that I still have some time in my hands before I can make a decision. Thank you so much!

Michelle Nguyen 3F

I usually go on "Quick links" on the top left hand corner, and when you click on it, you should have options for which posts to look at. The first one says "your posts," so click on that to find your posts! :)

Michelle Nguyen 3F

Ionization energy increases going right on the periodic table because the number of protons in the nucleus increases, the ionization energy or attraction will increase. The nucleus brings in the electrons closer together because of the increase in attraction. Ionization energy will then decrease goi...

Michelle Nguyen 3F

Why did the attacking army use acid? To neutralize the enemy's base!

Michelle Nguyen 3F

I usually destress from midterms by taking a nap or drawing a doodle afterwards to let the test stress go away :')

Michelle Nguyen 3F

Mr. Lavelle, Thank you for always being transparent with deadlines! The lectures are easy to understand, and has helped me with clarification when reading the textbook. Thank you for updating the website whenever needed, and I am having a great time in your class :') Can't wait to have 14B! Sincerel...

Michelle Nguyen 3F

I don't think there is a specific order you need to go in! I was told to balance H's and O's first in HS, and that has helped me out, and hopefully that can help you out too. :)

Michelle Nguyen 3F

Yes, with the Lyman series, just assume that the final stage is n=1!

Michelle Nguyen 3F

We do not have much names of the molecular shapes and bond structure to memorize for Midterm 2! But once we start learning more VSEPR shapes, would we be expected to memorize all the names and bond angles of the shapes?

Michelle Nguyen 3F

Trailing zeros after a decimal place count! 20.00 would count as 4 sig figs, but if there was no decimal place like 200, it would only be 1 sig fig

Michelle Nguyen 3F

We would only need to know the general trend of electronegativity across the periodic table!! We do not need to know the exact numbers, I think we would get a table for the exact electronegativities for each element. :)

Michelle Nguyen 3F

Sometimes, I get confused between formal charge and oxidation numbers. Can someone tell me the difference between the two?

Michelle Nguyen 3F

For Hz, it is 1/s = Hz. For Joules, it is 1 J= 1 kg m^2/s^2. Hope this helps!

Michelle Nguyen 3F

To get picometers, it would be 1m = 1*10^12 pm.

Michelle Nguyen 3F

Yes the excess energy is still classified as kinetic energy. If the work function is less than the energy of a photon, then the 'excess' kinetic energy of the electron will result as the difference. Since electrons have mass, this energy would be kinetic. Thank you! This was a good explanation that...

Michelle Nguyen 3F

Before finals, I would just take a deep breath in and out to calm down! It's already a big accomplishment to make it this far into the quarter, let alone take the test. :) If you need to study at the last minute, I suggest studying the second to last night before the test. Cram during that time, and...

Michelle Nguyen 3F

I do not think that there is a cutoff for rounding, especially since the numbers just tend to be very close to round. There would be "cutoffs" for when we should round, such as having _.33 and then multiplying by 3 to get the closest number.

Michelle Nguyen 3F

The difference usually depends on the context of the problem. Sometimes when v is used as velocity, f is used for frequency.

Michelle Nguyen 3F

When that happens, try to multiply it to get the lowest coefficient possible. For instance, if you have 7.5, multiply it by 2 to get 15. If you have 3.33, multiply by 3 to get 10. It's important to look at the decimals to see what number you should multiply by.

Michelle Nguyen 3F

eV stands for electron volts, and the conversion is 1eV = 1.602*10^-19 J

Michelle Nguyen 3F

The only rule for the Lewis Dot structure that I remember is that the first four electrons have to fill up each of the four sides before adding on the next four. For the non-noble gases after four electrons, I don't think the placement of the electrons matter.

Michelle Nguyen 3F

"Did you know that oxygen went for a second date with potassium?"
"How did it go?"
"It went OK2!"

Michelle Nguyen 3F

For me, I usually read the textbook after going through the lectures. The lectures have everything condensed so that it is easier to grasp the concepts when you read the textbook for more specific details. It's really easy to get lost in the vocabulary and equations (as well as the formatting) of th...

Michelle Nguyen 3F

Usually, the actual yield will be given to you while the theoretical yield will be calculated!

Michelle Nguyen 3F

Roman numerals show up most often in transition metals, as depending on what they bond with, they could have different charges. The main approach is when you're given a formula, know the charge of the other atom and then you would know the charge of the transition metal. For example, if you are give...

Michelle Nguyen 3F

Yes, oxygen air would be oxygen gas! Oxygen is a diatomic particle, so it would be written as O2.

Michelle Nguyen 3F

Black body radiation will not be in the midterm. If you do want to know a little bit about it, black body radiation can absorb all light, but we cannot see that since it does not reflect light.

Michelle Nguyen 3F

Lillian Ma 1L wrote:You could write it in scientific notation so that it would be 4.10x10^4, that way the 0 is after the decimal point and counts as a sig fig.

I agree with this, especially since it is a trailing zero after the decimal point

Michelle Nguyen 3F

For finding the molecular formula, no the structure and double bonds do not hold significance. It's basically counting up how many elements and how many of each element there are. However, if you are trying to find the Lewis structure from the molecular formula, you would have to draw it out, and th...

Michelle Nguyen 3F

You can tell when you are given the molar mass of the molecule! If you find the total mass of the molecule you already found after mass percent composition, and it is the same as the given molar mass, then you have found the molecular formula. If the total mass if the molecule you have solved for is...

Michelle Nguyen 3F

Like others have said, it's not really important to convert the final answers all the way to nanometers. The biggest thing would be to remember that the formulas for frequency are calculated in meters, so that there wouldn't be a slip-up and writing down something like "1.56*10^-7 nanometers&qu...

Michelle Nguyen 3F

Yes it does! Thank you so much! :)

Michelle Nguyen 3F

Hi! I was reading the textbook in Focus 1, and I saw that there was a ratio "e/m, the ratio of the magnitude of the electron’s charge e to its mass m." I am overall just really confused on the concept because of the values of e=1.602×10^−19 C and m=9.109×10^−31 kg. Can someone please expla...

Michelle Nguyen 3F

Thank you so much! My biggest problem has been just figuring out the trailing zeros, but these rules helped, so thank you. :)

Michelle Nguyen 3F

For me, I usually only take notes on the textbook if I believe it is in important. Like stated above, if lecture content is in the textbook, then I won't write it down because it would probably already be in my notes. If the textbook clarifies something from the lecture, I usually write it in the ma...

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