CHEMISTRY COMMUNITY

Elizabeth Johnson 1I

lets pray there is a curve/grade shift

Elizabeth Johnson 1I

yeah dj ll was not chill at all for putting titrations on it

Elizabeth Johnson 1I

Nare Arakelian Dis 3E wrote:This is amazing

yeah, it is ¯\_(ツ)_/¯

Elizabeth Johnson 1I

I literally left this chem class being so excited about being done and i forgot about my posts so here I am still doing chem stuff smh

Elizabeth Johnson 1I

it's Numb by Portishead
I found it out and thought it should be known by the general public that's all

Elizabeth Johnson 1I

dr lavelle pls be a homie and make the class average at least a B

Elizabeth Johnson 1I

lol okay good bc I see stuff in chem community that I've never seen before and it always stresses me out so much

Elizabeth Johnson 1I

yes that's exactly it. The ones Lavelle went over were bidentate (2 e pairs), tridentate (3 e pairs), and hexadentate (6 e pairs)

Elizabeth Johnson 1I

when we are talking about donating a proton, it's always in reference to hydrogen, correct?

Elizabeth Johnson 1I

It's a week before the final and there is no update on the website :/ not chill laurence

Elizabeth Johnson 1I

I think a really big part of relieving that feeling is affirming yourself that you did everything you could up until that point and you are as ready as you'll ever be for it. I always take 3 deep breaths before I start any test and find the problem I'm most confident in and start the test by working...

Elizabeth Johnson 1I

Giselle Littleton 3K wrote:Inorganic compounds are more likely to completely deprotonate.

can someone define what deprotonate means?

Elizabeth Johnson 1I

I think I have a general understanding but what are the specific differences between molecular shape and electron configuration. Why do we even bother with the molecular shape? What are their respective significances?

Elizabeth Johnson 1I

Are we expected to know this stuff for the class or is this forum more just about entertaining curiosity?

Elizabeth Johnson 1I

What is a coordinate number and how do we determine it?

Elizabeth Johnson 1I

A ligand is an electronically rich species and must have 1 or more lone pairs

Elizabeth Johnson 1I

Nare Arakelian Dis 3E wrote:Thank you so much!

i really appreciate you showing appreciation

Elizabeth Johnson 1I

Have we gone over sigma and pi bonds yet? Do we have any more information about what exact material will be tested? Lavelle said he would discuss sigma and pi bonds on Monday. ... so are sigma and pi bonds going to be on the test? I think the TAs said they were trying to have the tests done by Sund...

Elizabeth Johnson 1I

brennayoung wrote:Is there any practical application to viscosity like do yall know if there are any formulas that factor in viscosity or is it more just a property of certain substances to be aware of in general knowledge?

Yeah is this anything to bother with for the 2nd test?

Elizabeth Johnson 1I

Yailin Romo 1B wrote:test covers material not covered on the midterm and up to Mondays lecture.

ooft I think my TA said until Friday's lecture; I guess we'll see tomorrow

Elizabeth Johnson 1I

honestly, I am just making flashcards and memorizing but if anyone has any tricks or like actual ways of solving, pleaaase share

Elizabeth Johnson 1I

105311039 wrote:It will cover material from the midterm and on!

ah wait so are you saying that the material on the midterm is fair game?

Elizabeth Johnson 1I

This is semi-related but the final will be cumulative rather than just the 2nd half of the course, right?

Elizabeth Johnson 1I

I would do the online modules and go through the problems assigned for homework. I believe all of the questions will be taken from there, so it's almost like an exact study guide. Yeah this is probably the best way to study/learn material. I need to stop playing games and actually do all the questi...

Elizabeth Johnson 1I

You would want the formal charge on the central atom to be closer to zero because its supposed to be the least electronegative. this confuses me bc in our discussion, our TA gave the example of PCl5, which has a -1 charge. The lewis structure has the P in the middle with a formal charge of -1, but ...

Elizabeth Johnson 1I

Dipoles are the partial negative and partial positive charges on molecules which have atoms with a notable difference in electronegativity. We can figure out if a molecule will have a dipole by calculating the difference in electronegativity between atoms. what is the cutoff for difference on elect...

Elizabeth Johnson 1I

we won't have to expand an octet to 18 e on the midterm, right?

Elizabeth Johnson 1I

lol i'm happy to see that others are also having panic attacks about sigma and pi bonds but I think we're not going to see it on the midterm bc we've never talked about them

Elizabeth Johnson 1I

KeyaV3A wrote:If a compound is made from a metal and a non-metal, its bonding will usually be ionic and if it’s made from two non-metals, its bonding should be covalent

how do metalloids play into that, though?

Elizabeth Johnson 1I

Not my TA, but Ben said that so long that he can follow the mental process you took to find the charge, you'll get full points. Definitely check in with your TA, though. TBH, my rec is to just do the FC equation. Better safe than sorry.

Elizabeth Johnson 1I

yes! If it's possible, you're going to want the charges to be on the surrounding atoms rather than the central atom. I honestly couldn't tell you exactly why it's better, but it's better to not have a localized charge.

Elizabeth Johnson 1I

Let's pray to the chemistry gods that high school stuff will be on it for easier points lol

Elizabeth Johnson 1I

How do metalloids play into this?

Elizabeth Johnson 1I

this is a stupid way of remembering it, but I like cats so cations are positive and I dislike onions, so anions are negative

Elizabeth Johnson 1I

Kimme Chun 1I wrote:For the s and p block, the number of valence electrons is the last number in the group. For the d block, you have to figure out the electron configuration to find how many electrons are in the outermost shell.

How do you figure out the electron configuration for d block elements?

Elizabeth Johnson 1I

are we expected to know the bond lengths or is it safe to assume they will be given if needed?

Elizabeth Johnson 1I

Thank you all so much for replying! This clears so much up! :) Chem community pullin thru

Elizabeth Johnson 1I

isn't it all about the number in the front? I honestly don't know why but that's what my TA said in our section lol

Elizabeth Johnson 1I

Is the work function the same as the ionization energy then? No, work function is the energy required to remove an electron from a solid, like the metals we have been talking about in lecture. The ionization energy is the energy required to move an electron from an atom in the gas phase. oop there'...

Elizabeth Johnson 1I

Nare Arakelian Dis 3E wrote:Is the work function the same as the ionization energy then?

bruh what is ionization energy

Elizabeth Johnson 1I

I'm a little confused as to if some of these words are interchangeable or not. If you guys could define them and their differences from one another that would be amazing.

Elizabeth Johnson 1I

i'd double check with your TA to see when they check but typically it's 11:59 on sunday

Elizabeth Johnson 1I

yes please! my email is ejohnson2023@ucla.edu

Elizabeth Johnson 1I

Thanks Kev I appreciate you replying so quickly :)

Elizabeth Johnson 1I

Tyler Angtuaco 1H wrote:This means that your answer is the molecular formula. If the ratio of its elements' atoms cannot be simplified further by the same positive, whole number ratio, then there is no empirical formula.

It can be both the empirical and molecular formula, so there is still an empirical formula :)

Elizabeth Johnson 1I

Can someone explain what Angstroms are? I was confused on the test on this question. That one confused me too! However, I realized that the conversions were on the front of the test on the resource page. 1 Angstrom is 10 -10 m. For that problem, you could use the conversions listed on the front of ...

Elizabeth Johnson 1I

I'd say doing all the homework problems is the move, but if I was a TA I'd be annoyed if everyone gave me stapled papers with all their work rather than just one page with 5 problems that I could easily grade. My system so far has been just recopying the problems on a new piece or turning in a sheet...

Elizabeth Johnson 1I

Are the 5 posts due by Friday? I heard they might be due by Sunday. I don't know. Our TA didn't know when we asked and I'm really not trying to lose points lol

Elizabeth Johnson 1I

I definitely will be needing this! Does anyone know how to sign up for the step-up program or Peer Learning Sessions?

Elizabeth Johnson 1I

I too am struggling with this! I think I'm going to review the Fundamentals Section D of Nomenclature to brush up on it. I don't think we'll be directly tested on it, so for the meantime, I think we're alright, but it definitely won't hurt us to get some extra practice.

Elizabeth Johnson 1I

The zeroes at the end of a number (past the decimal) signify more precision, so a measurement of 20.0000 ml (6 sig figs) is more precise than a measurement of 20.0 ml (three sig figs), even though to the layperson they would mean the same thing. A measurement of 20 ml would only have 1 sig fig. If i...

Elizabeth Johnson 1I

This is so precious! Thank you for sharing your journey with us! We wish you the best :)

Elizabeth Johnson 1I

It's been a couple of weeks since I took the diagnostic test, but from what I remember, there was a proceeding page that had the results. I honestly don't think the diagnostic test is all too helpful in determining which class you should be in, though. A lot of us are feeling the same about being ru...

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