CHEMISTRY COMMUNITY

Darren1j

Also for some reason Our planet is a very soothing show for me

Darren1j

Didn't see it on here so have to recommend Lupin on Netflix if youre into mystery.

Darren1j

Also, the power of habit by Charles Duhigg is an incredibly powerful read!

Darren1j

Reading a promised land rn. Its long and a little slow but very interesting

Darren1j

200 points= 50%= c- = Pass!

Darren1j

YAYYY congrats to everyone. Take some time to breath before you think about the final please

Darren1j

How is Pang for BL ? (Summer session)

Darren1j

Or is it proportional to the time we spent learning it like 14a?

Darren1j

What will be the breakdown of the test? Like how much from each week?

Darren1j

now that outdoor dining is opening again... PHO!!

Darren1j

How long before the final do yall normally start studying?

Darren1j

I was lucky to get all three and the sections I wanted though.

Darren1j

I'm taking 14C, Ls7c, and 23L. I'm sure there are some others taking this as well. Not sure about adding another class onto the schedule since orgo sounds hard and bio is usually time-consuming to read already,

Darren1j

It seems like other places including our own Socal are now having power outages too. Praying for all those especially those in Texas at the moment.

Darren1j

Don't worry, Lavelle is usually quick about uploading grades!

Darren1j

It says 14c will be "online," but will the recordings be posted as well?

Darren1j

I felt overwhelmed with how many different situations it seemed like there is in thermo, but as someone mentioned earlier, it's really important to understand the underlying concept. If you study the concepts and understand what the variables mean, then it will be easier to critically discern betwee...

Darren1j

Happy for all of us! Almost at the finish line, keep trucking forward.

Darren1j

Can we get a Lavelle sponsored CD. He always got bops on

Darren1j

That is the same feeling I had. I think the questions were so vague that I didn't know which answer to choose even though I knew the methods.

Darren1j

At least 1 workshop a week is a must. Maybe a step up if you have time too

Darren1j

chem lectures :(

Darren1j

Oh man that's really helpful thanks!

Darren1j

How much of 14B is in 14C. Would I be at a disadvantage if I wait to take it in the fall instead of this spring?

Darren1j

These sound really interesting! Are there any ones in person that you guys would recommend for when we are back on campus?

Darren1j

Has anyone asked their TA's to review their this quarter? I did in 14A but wondering if they are still doing it this quarter

Darren1j

I think doing Sapling is really good at first because it gives you hints on how to figure it out yourself. It can make you more comfortable with the material. Then, you can challenge yourself with the textbook problems.

Darren1j

I did all the textbook problems and felt well prepared, but I feel like I made simple mistakes and the questions were oddly worded. I felt like my score was a lot worse than the knowledge of the material that I have.

Darren1j

Does anyone have tips on how to study for the second midterm AFTER they took the first? What would you change?

Darren1j

Someone mentioned this above and I completely agree. I tend to make a lot of shortcuts in my head that translate into my scratch work. I think it's important to say things out loud when you can (Especially since there's no one around you when taking these tests right now.)

Darren1j

I'm glad someone posted about this. Dr. L even gave us that 10 point boost last quarter. He is one for the students. If you see this, just know our student group chats love you Dr. Lavelle, and we appreciate you caring about our mental health.

Darren1j

Hey hey, I work two 8 hour shifts a week, and I have it set up so that I work Monday and Saturday. I also found it to be most efficient to work as early as possible so I can do other things later in the day. Monday is my grind day, so I only go to work and do school work. I also have wednesday where...

Darren1j

LIFE SAVER. Thank you so much, may all the blesses come to you this quarter.

Darren1j

Oh my, I didnt expect to see these many recommendations on this list. Thanks a lot, I am definitely going to try to watch through the bolded ones this year.

Darren1j

Done with the first one! Feels good, and gives everyone a taste of what Dr. Lavelle will be expecting on the next one and the final. If you felt like you studied enough, great. If you feel like you didnt, theres another 2 tests that can get your grade up. Don't stress too much please!

Darren1j

Hey, I wanted to comment on this because this is a situation I resonant with and one that I'm sure a lot of people in college have been unfortunately experiencing during the pandemic. Honestly, the biggest thing that helped me is having a routine, and writing down my assignments on a planner ( I use...

Darren1j

For 4.E.5, Looking at the lewis structure for C2H2 gives us 1 C-C triple bond, which has an enthalpy of 837, and also 2 C-H bonds which have a combined value of 824. Add these 2 numbers and multiply by the moles, which is 3, and you get the total enthalpy for C2H2, 4983. For benzene, the table of b...

Darren1j

The solution manual is on sapling. Once you log in, click on resources, then " Atkins 7e SSM." It should download a pdf with the textbook solutions

Darren1j

Oh my gosh I was doing the homework and trying really hard to figure this out with the molarity. Glad someone asked this because I needed the hint!

Darren1j

If K is the constant at equilibrium, and equilibrium means that the forward and reverse reaction happens at the same rate, then why are products ( or reactants) "favored" in some reactions?

Darren1j

Does anyone recommend reading the textbook for midterm prep?

Darren1j

Anyone know when we will find out the number of questions on the exam?

Darren1j

What do you call a clown who's in jail? A silicon!

Darren1j

Why did the white bear dissolve in water?........Because it was polar! ( no? okay)

Darren1j

You think you’re a 10? On the pH scale, maybe — because you’re basic.

Darren1j

Why do chemists favor nitrates?
Because they are way more affordable than the day rates!

Darren1j

when potassium and oxygen went on their first date, it turned out fine. The second time that oxygen went on a date with potassium it was OK2

Darren1j

Nick P 3D wrote:H2O is water and H2O2 is hydrogen peroxide.
What is H2O4?

Drinking

Day 5 still trying to figure out the meaning of this joke.

Darren1j

For the longest time I kept getting it wrong because I didn't realize total pressure meant add all of the new equilibrium values.

Darren1j

In relation to this topic, why do we say that two reactants or products have the same x value. Don't different compounds have different amounts used in a reaction ( such as a limiting reactant)?

Darren1j

Gold is my favorite part of the periodic table because it is AU-some!

Darren1j

I need someone to look after my electron today, do you mind keeping a ion it for me?

Darren1j

I was confused as to what the K value means for the reverse reaction, but this explanation cleared it up a lot because both reactions take place simultaneously.

Darren1j

Two of the sapling questions revolve around K and change in enthalpy. Thus in reactions with a + change in enthalpy, they are endothermic, and increasing the temperature increases K. In a reaction with a negative change in enthalpy, it is exothermic, and an increase in temperature decreases K.

Darren1j

I just set up my problem like [HI^2]/ [H2][I2] =53.3. I know this doesn't yield the right answer, but why?

Darren1j

Why is it 2x. I thought the fact that there is 2HI is accounted for in the HI^2?

Darren1j

Basically if this class follows basic grading scales (93% for A, etc) then you can miss 35 points total to get an A and 50 points for an A-. This is only IF it follows the way other classes do it, but it very well could be different.

Darren1j

I've been going back and doing the textbook problems and found a bunch of the midterm questions on there. Dr. Lavelle doesnt lie haha.

Darren1j

What does a chemist say when in pain? "Ouch that HERTZ!"

Darren1j

Why would Dr. Lavelle be like every other professor and not dance at the start of lectures? If he didn't, he'd be pretty Basic.

Darren1j

This is a great tip! Has anyone come up with one for strong bases?

Darren1j

Don't worry guys, I'm working on a still image magnifying program to figure out this intense problem.

Darren1j

I've heard people say its good to take it with chem 14c. Would anyone recommend taking it over the summer or would taking it during the year be better?

Darren1j

By studying homework problems, are you referencing sapling or the textbook?

Darren1j

Having retuned from taking the section on coordination compounds and Iron, being rusty on chemistry is a pun in itself.

Darren1j

on the sheet, theres the two names for every ligand. Why did IUPAC decide to change the names?

Darren1j

What is a cation afraid of?
.... A dogion.

Darren1j

Wish me luck guys, I'm planning on being at a session everyday this week. After this midterm, I am confident in myself but know that I made plenty of easy mistakes. I have faith in all of you!

Darren1j

Our tradition is that my mom gets to not cook, and every one else in the family has to impress her with our creations. We try to be creative, and this year we tried variations of mac and chees, mashed potatoes, BBQ turkey and ribs, brussels sprouts etc. I personally never really cook so it is my one...

Darren1j

I usually set a time the day before a test to STOP studying and start relaxing. Theres a trade off between studying and de stressing, and if you cram too much the day before, the balance will get disrupted. You should do all the textbook problems that you can, and go to as many workshop, US, step up...

Darren1j

Also, how can you calculate what grade you need on the final to get an A?

Darren1j

Anyone know how many questions will be on the final?

Darren1j

I am wondering whether to wait on switching one of my classes to not overlap with one of his chem lectures. Would the midterms probably be in the middle of the week (wednesday)? Was this how it was in the past?

Darren1j

Speaking of memorizing the shapes, does anyone know the scientific origination of the sea saw VSEPR shape? It seems like a pretty unacademic term which makes it funny to learn about.

Darren1j

Why are lone pairs more "diffuse" or take up a larger space than bonding pairs do? Since they all are areas of electron density

Darren1j

have you heard the new remix of girls just want to have fun? It goes something like "Hydrogens' just want to have FON..."

Darren1j

I had this same question and I think there's a reason for that difference. In this case H-F H-F, I think its classified as a hydrogen bond and therefore would be -20 but other dipole-dipole interactions that are not hydrogen bonding would be around -2. H Bond is Dipole-Dipole, but dipole- dipole doe...

Darren1j

I just wanted to ask, why do molecules have fluctuating electron densities? N2 should both be equally electronegative but what causes fluctuations? (as it relates to Van der waals forces)

Darren1j

Like the above question asked, did Dr. Lavelle mention that 14b will be asynchronous as well?

Darren1j

Are you made of copper and tellurium? Because you are Cu Te

Darren1j

The kids were mad at their teacher because they wanted to know why they're answer was incorrect. The chemistry teacher replied, " I am a chem teacher, if I don't have a solution, I'll make one up!."

Darren1j

Could someone explain the differences in molecular structure between increasing anion vs increasing cation size? Also, How does polarizing power relate to distortion?

Darren1j

Are radicals only produced when a large amount of energy is provided to make the bonds break? Why doesn't the compound break into two stable molecules instead?

Darren1j

I had this same question so I was wondering if someone can provide some more recent insight. Or do the same ideas mentioned earlier still hold true?

Darren1j

I was also going to ask if Hund's rule applies to Lewis dot structures because Lavelle had shown Oxygen with 3 pairs of electrons rather than 2 pairs and 2 single electrons around the O.

Darren1j

can someone simply explain why one is stronger than the other.

Darren1j

Helium dimer seems like the funniest of molecules because he2 would be like He He.

Darren1j

What kind of dogs does Dr.Lavelle have? I'm going to take a wild guess and say laboratory retrievers

Darren1j

How do you know whether an atom has to gain electrons to fill its shell to become stable, or lose enough electrons to drop to the lower shell to be most stable?

Darren1j

Referring to general atomic radius, why does gaining an electron make the radius bigger and losing an electron make the radius smaller?

Darren1j

Hey, I have question from this same module. Question 30. "Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. .... What is the frequency of the incident light on the sodium metal surface?" Are you s...

Darren1j

I think its best to spread out studying through the week and to do all the things that the people above had mentioned. Read the textbook before the lecture, and then try to do the hw problems. If you want more practice try the audio-visual focus assignments and attend some of the over 40 hors of hel...

Darren1j

I told this one to my mom earlier ^. Sadly, I got no reaction :(

Darren1j

I'm sad that the jokes on here have slowed down. They used to be posted everyday, but now they only happen periodically.

Darren1j

This question asks "How many electrons in an atom could have these sets of quantum numbers?"
a) n= 2
b) n=5, l=1
c)n=7, l=1 m (subscript l) =-1

Can someone clarify how to use the n and l values for this question and their application in general.

Darren1j

I understand what the uncertainty is, because we cannot measure the exact momentum and position of an electron but how do they even determine the "amount" of uncertainty.

Darren1j

So I remember him saying R= 3.29x10^15hz, but when I look it up online it says it is 1.0874x10^-7 m^-1. Are they the same in different units?

Darren1j

The posts above ^ helped me figure this out. Basically, going from a higher level to a lower level causes spectral lines. To find the range of wavelengths, you must use the Rydberg equation. You use the n=7 to n=6 for the first wavelength and n=7 to n=1 for the second wavelength. The equation is v (...

Darren1j

Going forward then, would we use the equation or the multistep process for these problems?

Darren1j

A question to anyone in 14a currently or who have already taken the class. How prepared are you for the tests by just watching the lectures, attending discussions and doing the sapling homework. Does reading the textbook thoroughly help significantly? What are ways you have found to be successful in...

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