CHEMISTRY COMMUNITY

Joanne Yuh 3I

A proton and a neutron were walking down the street. The proton says, "Stop, I dropped an electron. Help me look for it." The neutron asks, "Are you sure?" The proton replies, "Yes, I'm positive."

Joanne Yuh 3I

What did the chemist say when he found two isotopes of helium?
HeHe

Joanne Yuh 3I

What do you call a tooth in a glass of water?
A one molar solution.

Joanne Yuh 3I

Hi Dr. Lavelle, Thank you for two great quarters! I appreciate your efforts and concerns to help students get all the academic help you can provide through Chemistry Community, TA/UA workshops, and your office hours. I'll definitely miss your chemistry jokes, songs, and lectures! Best regards, Joann...

Joanne Yuh 3I

Yeah bonus questions were 4 points in past midterms so I assume it's the same for the final.

Joanne Yuh 3I

Someone threw sodium chloride at me.
I yelled, “That’s a salt!”

Joanne Yuh 3I

I tried writing jokes about the periodic table…
…but I realized I wasn’t quite in my element.

Joanne Yuh 3I

I'm looking forward to having a real college experience and meeting my friends in real life! I'm also looking forward to the good food in LA.

Joanne Yuh 3I

I think chemical equilibrium was my favorite chem topic! It was kind of tricky to grasp the concepts at first but I think I got the hang of it later.

Joanne Yuh 3I

I try to get plenty of sleep the night before the exam because I think it's important to have a clear mind and sleeping enough instead of cramming last minute.

Joanne Yuh 3I

Make sure to review the outlines! I made study guides that summarized my notes for each bullet point on the outlines and they helped me organize the info. Also, do the textbook problems and review over sapling problems.

Joanne Yuh 3I

I like chemistry jokes periodically.

Joanne Yuh 3I

I try to tell chemistry jokes but there is no reaction.

Joanne Yuh 3I

For 14A, the final had more questions on topics that Professor Lavelle spent a longer time teaching. So, if you struggled with the midterm 2 content, then it might be good to focus a bit more on those topics since thermodynamics/thermochemistry was heavily focused on.

Joanne Yuh 3I

Like what people said previously, the max amount of points you can get is 50/50 but you can still post more than 50 comments.

Joanne Yuh 3I

Yeah I think you're still allowed to post more on Chemistry Community but you won't get extra points.

Joanne Yuh 3I

I feel like I will never get used to how fast the quarter system is but yeah, now that our final is only 2 weeks away, I should really start preparing.

Joanne Yuh 3I

I recommend UA workshops because they're really helpful with summarizing lectures and giving advice. If you still need help, you can look up youtube videos like Organic Chemistry Tutor for extra help!

Joanne Yuh 3I

Element 1: Oh no! I lost my electron.
Element 2: Oh no! Are you positive?

Joanne Yuh 3I

What did Sodium and Neon say when someone told a joke?
That was sodium funny. I slapped my neon that one.

Joanne Yuh 3I

The optimist sees the glass half full.
The pessimist sees the glass half empty.
The chemist see the glass completely full, half in the liquid state and half in the vapor state.

Joanne Yuh 3I

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO

Joanne Yuh 3I

Have you heard the one about a chemist who was reading a book about helium?
He just couldn’t put it down.

Joanne Yuh 3I

Sapling is very helpful! Make sure to look at the solution explanations at the end of each problem because those explain a lot of concepts and steps and they're really helpful.

Joanne Yuh 3I

Yes UA sessions are very helpful! Some UAs do a quick summary of the concepts that we are learning at that moment so their workshops clarify a lot of the information that we learn during the lectures. Also, I recommend doing study calls with other students to go over and review the main concepts of ...

Joanne Yuh 3I

I checked my grade on MyUCLA today and everything disappeared except for the Midterm 1 grade. Before, I was able to see my Sapling and Chemistry Community grades but now they aren't there anymore. Is it like this for anyone else or just me?

Joanne Yuh 3I

I make bad chemistry puns, but only periodically.

Joanne Yuh 3I

What do you call an acid with an attitude?
A-mean-o acid.

Joanne Yuh 3I

I'm out of chemistry jokes. I should zinc of a new one.

Joanne Yuh 3I

My name's Bond, Hydrogen Bond.

Joanne Yuh 3I

You solve Kc and Kp the same way. You mostly only convert the concentration to pressure or pressure to concentration if the problem asks you to or there is an inconsistency in the units.

Joanne Yuh 3I

What's a chemistry teachers favorite thing to teach about? Ammonia, because it's pretty basic stuff.

Joanne Yuh 3I

Two atoms are walking down the street. One atom says to the other, "Hey! I think I lost an electron!" The other asks, "Are you sure?" "Yes, I'm positive!"

Joanne Yuh 3I

What's the dullest element?
Bohrium!

Joanne Yuh 3I

Anions aren't negative, they're just misunderstood.

Joanne Yuh 3I

I totally understand what you mean! It's so hard to find time for ourselves especially because most of us are always stuck at home. I agree with what the person said above. Make sure to find a hobby where you can destress from school work. I usually do random art activities because it's easy to forg...

Joanne Yuh 3I

Yes I agree with what people said above. Since steam goes from gas to liquid, it has a large negative enthalpy of condensation, so steam causes worse burns than boiling water because water is cooling down with no phase change.

Joanne Yuh 3I

I agree, I felt a little rushed this time but definitely not as much as during the final last quarter. I think doing the textbook problems really helped though! Yeah I'm glad I did the textbook problems because I noticed that some of the midterm questions were either exactly the same or similar to ...

Joanne Yuh 3I

What do you call a wheel made of iron?
A ferrous wheel.

Joanne Yuh 3I

What did one titration say to the other?
"Let's meet at the endpoint."

Joanne Yuh 3I

If H2O is the formula for water, what is the formula for ice?
H2O cubed.

Joanne Yuh 3I

K is a general term for Kc and Kp. I agree with what the people said above. I also recommend using context clues from the problem to decide which K use. If the values are in partial pressure, then you should probably find Kp unless specifically noted.

Joanne Yuh 3I

You should definitely look at the outlines to make sure you know which topics are on the midterm. And also make sure to do the textbook problems! If you have time, you can do the UA worksheets for extra practice.

Joanne Yuh 3I

I was looking at the bullet points of topics listed in Outline 1 and one bullet point said "use equilibrium constants to predict solubility." I can't find anything about this topic in my notes. Did we ever learn this? If so, how do we use equilibrium constants to predict solubility?

Joanne Yuh 3I

I tried writing jokes about the periodic table…
…but I realized I wasn’t quite in my element.

Joanne Yuh 3I

What should you do if no one laughs at your chemistry jokes?
Keep telling them until you get a reaction.

Joanne Yuh 3I

Oxygen, hydrogen, sulfur, sodium, and phosphorous walk into a bar.
“OH SNaP!” says the bartender.

Joanne Yuh 3I

I recommend you do the textbook problems because they are good extra practice. Also, I don't think you need to read the textbook but you should look at the textbook if you are confused about a specific topic because the textbook gives detailed explanations and examples.

Joanne Yuh 3I

Professor Lavelle will probably send us an email soon about Midterm 1. This is just my guess but I think all of Outline 3 might not be on the exam because I remember last quarter for Chem14A, we were tested on parts of an outline that we didn't finish before the Midterm 1 date.

Joanne Yuh 3I

I agree with what the people said above. For strong bases and acids, we usually don't need to use an ICE box because we are saying that they completely dissociate in water so we can directly use the log calculations. However, for weak acids and bases, we need to use an ICE box because they don't com...

Joanne Yuh 3I

What was Avogadro's favorite sport? Golf! He always got a mole-in-one!

Joanne Yuh 3I

I agree with what the people said above! Use the ideal gas law PV=nRT to determine the relationship between the concentration and pressure and you can convert between them.

Joanne Yuh 3I

What do you call a tooth in a glass of water? A one molar solution!

Joanne Yuh 3I

What's a chemistry teachers favorite thing to teach about? Ammonia, because it's pretty basic stuff.

Joanne Yuh 3I

Why does a hamburger have less energy than steak? Because it's in the ground state!

Joanne Yuh 3I

Real gases do not act like ideal gases but most act similarly to an ideal gas, which is why we can use the ideal gas law to predict the behavior of real gases. It's easier to approximate the behavior of real gases at STP: 0˚C and 1 atm.

Joanne Yuh 3I

I agree with what was said previously. Also, other problems might specify the K value as Kp if they want you to find the K using the partial pressures.

Joanne Yuh 3I

Hi Professor Lavelle, Thank you so much for this quarter! We're lucky to have a professor who's passionate about his course and tries his best to help students understand the material. Especially with everything online, I really appreciate you arranging review sessions and other virtual interactions...

Joanne Yuh 3I

What happened to the man who was stopped for having sodium chloride and a nine-volt in his car?
He was booked for a salt and battery.

Joanne Yuh 3I

What kind of dogs do chemists have?
Laboratory Retrievers

Joanne Yuh 3I

What kind of fish is made out of 2 sodium atoms?
2 Na

Joanne Yuh 3I

I'm doing fine! I can't believe this quarter is almost over already. I hope you all have a great winter break and see you guys in Chem14B!

Joanne Yuh 3I

Maddie Turk Disc 2C wrote:ligands are just the things attatched to the central atom right?

Yes, generally ligands are the Lewis bases that are attached to the central atom. They are e-pair donors of the molecule/ion.

Joanne Yuh 3I

Like people said earlier, the grade for Chemistry Community will be updated on Thursday because the deadline was extended. Also, I think it also depends on your TA because I think they are responsible for updating your grades.

Joanne Yuh 3I

What do you call a wheel made of iron?
A ferrous wheel.

Joanne Yuh 3I

What element is derived from a Norse [censored]?
Thorium.

Joanne Yuh 3I

What did one titration say to the other?
"Let's meet at the endpoint."

Joanne Yuh 3I

When will we get our final class grades for this class?

Joanne Yuh 3I

Just to clarify, we use our TA discussion zoom link for the final exam, right? Or is there a new list of TA zoom links that we have to use?

Joanne Yuh 3I

Yes, c is always the speed of light and it will not change based on the topics we have learned so far. The wavelength and frequency values will change to equal to the speed of light.

Joanne Yuh 3I

What did one ion say to the other?
I've got my ion you.

Joanne Yuh 3I

Why was the mole of oxygen molecules excited when he walked out of the singles bar?
He got Avogadro's number!

Joanne Yuh 3I

I'm not entirely sure if my response is correct but I think it has to do with the shape of the H2O molecule. The water molecule is a bent shape so it makes more sense for the two lone pairs to be next to each other. And I think since XeF4 has a nonpolar structure, it has its 2 lone pairs opposite fr...

Joanne Yuh 3I

On Professor Lavelle's website, there are 2 other outlines (Outline 5: Coordination Compounds and Their Biological Importance and Outline 6: Acid and Base Structures and Properties). Will these outlines be covered by the final or is Outline 4: Molecular Shape and Structure the only new outline that'...

Joanne Yuh 3I

Yeah Professor Lavelle hasn't said anything about our final, but I'm sure he will notify us soon. He'll clarify the format of our final, like whether or not if it's going to be multiple choice or free response or a both, and other questions like zoom proctoring and time of our final.

Joanne Yuh 3I

Why does a hamburger have less energy than steak? Because it's in the ground state!

Joanne Yuh 3I

Old chemists never die. They just stop reacting!

Joanne Yuh 3I

I agree with what the people said above. I also think that the question would include a phrase along the lines of "when the molecule interacts with itself" to specify that the question is asking about the intermolecular forces.

Joanne Yuh 3I

In general, it typically goes that a 93+ is an A and a 90-92.9 is an A-. I think an 87-89% is a B+, but I'm not really sure what the grading scale is past that. Also, another thing to be aware of is that most STEM classes don't round your grade up so even if you have a 92.9%, that would constitute ...

Joanne Yuh 3I

I agree with what the people said above. I might be wrong but I think you can also use electronegativity calculations to calculate bond polarity to determine whether the overall molecule is polar or nonpolar.

Joanne Yuh 3I

What is the chemical formula for "coffee"?
CoFe2

Joanne Yuh 3I

I think the Midterm #2 will cover the last 8 bullet points in Outline 2 (after 1D.2 in the textbook) and all of Outline 3.

Joanne Yuh 3I

Yes, all molecules have London Dispersion Forces. Professor Lavelle said in his lecture that these forces are "always present and attractive." I think this is because the electron densities are always fluctuating, which cause the dipoles to also fluctuate.

Joanne Yuh 3I

Yeah, I don't think we need to know the exact bond length because Professor Lavelle said in his lectures that the examples of bond length are from research and that we don't need to memorize them. Also, we just need to know the general trends of bond length through atomic radius trend and other conc...

Joanne Yuh 3I

Is there a difference between atomic radius and covalent radius? I know that the atomic radius and ionic radius are different but I'm not sure where the covalent radius stands.

Joanne Yuh 3I

What do you do with a sick chemist? If you can't helium, and you can't curium, then you might as well barium.

Joanne Yuh 3I

Have you heard the one about a chemist who was reading a book about helium? He just couldn't put it down.

Joanne Yuh 3I

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

Joanne Yuh 3I

Electronegativity is the tendency of an atom to attract a bonding pair of electrons. Electron affinity is the amount of energy released when an electron attaches to a gaseous atom. Ionization energy is the minimum amount of energy that is required in order to remove a loosely attached electron from ...

Joanne Yuh 3I

I don't really have a specific trick to memorizing the trends buy I mostly use two methods: 1. Many of the trends are the same (for example: ionization energy and electronegativity) so I memorize which ones have the same trends so it seems like I don't have to remember all of the individual trends. ...

Joanne Yuh 3I

Will Midterm 2 be the same format as Midterm 1, meaning will it also be all multiple choice questions or will there also be free response questions this time?

Joanne Yuh 3I

I recommend looking at the UCLA test bank. I also recommend doing the module assessment questions and textbook problems for extra practice.

Joanne Yuh 3I

What did the thermometer say to the graduated cylinder? You may have graduated, but I've got many degrees.

Joanne Yuh 3I

OMG! Did you hear that Oxygen and Magnesium are a couple?

Joanne Yuh 3I

Chemistry is Fluorine Uranium Nitrogen.

Joanne Yuh 3I

I usually do some hobbies like painting and drawing while listening to music. I become focused on that activity and forget everything else so it's very calming.

Joanne Yuh 3I

Yeah the grades will definitely posted after everyone has taken it. But I don't think the grades will take that long to be posted compared to previous midterms because we only had multiple choice questions and the old midterms were all free response problems.

Joanne Yuh 3I

I'm out of chemistry jokes. I should zinc of a new one.

Joanne Yuh 3I

Samin Kabir wrote:I also had a question... IS it gonna be curved?

I heard that the midterm is not going to be curved.

Joanne Yuh 3I

For the midterm, are we allowed to go back to previous questions or do we have to solve each question before going to the next?

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