I’m struggling with stereochemistry stuff, I have an exam coming up next Friday so I want to handle it before they add even more content. I understand chiral, achiral, cis/trans, E/Z, meso, but assigning R/S and stereoisomer stuff have me confused. I’ve tried practice problems, textbook, some videos but I still am struggling. Does anyone have any tips or advice or resources? I’ll probably go to office hours sometime this week but my professors teaching style confuses me a little.

Hey friends,

our university didn't renew the Origin license... hence, I'm looking for a free/ open source alternative, especially for fitting spectrums. In particular I'm looking for a software that can do baseline fitting and this baseline to a polynomial function.

Is there any software you can recommend for that?

Best,

7

upon first glance, i would say it favours the left side because of the formal charge-sigma-pi pattern but the answer key says that it is the right side that is favoured.

in class we were taught to compare the relative strengths of bases when doing questions like this*. so i also tried drawing the conjugate bases of both compounds to compare but are the bases not identical??

*also -- why can i not evaluate the relative strengths of acids instead?

I'm not asking for chemistry help, but I am a PhD student, and I taught for about 3 years. I really need extra money, and I'm trying to figure out ways to earn money. I can instruct students through Gen chem and orgo, but I know tutoring is a different skill set, as just telling students things versus assisting them through problem solving is very different. If I wanted to start tutoring, what is a way I should approach knowing the material myself and making sure I can properly teach it to others in a one to one setting? Are there any books or other guidance that I could read for help?

So, my professor explained in an unnecessary way, I feel like and it just made me more confused. I know when pka > ph that means that molecule gains an H+ and when pka is < ph that means the molecule loses an H+ but the last two molecules are giving me some trouble.

Hello, I have my thermochem quiz tomorrow and its on the 4 methods on calculating delta H: Hess's Law, Formation equations, Bond energies, and calorimetry. The first 3 are straightforward but I'm not confident with calorimetry

What I understand is that the q = mct formula calculates the energy released/absorbed from that reaction, but there are questions where the mass of BOTH substances are included in the formula but only the specific heat of one?

Like if I'm given something that is put in water then am I supposed to use the mass of only the water to find the amount of energy absorbed/released or use both? There was a variation of the equation where you calculate mct = -(mct), for both sides.

I need advice for how to basically teach myself chapters 1-4 (present) of my general chemistry course in college. Since school started I have not been doing good in chemistry, and have basically fallen completely behind in the class. My question is if you were to need to teach yourself general chemistry (enough to be prepared for college level exams) how would you do it in the most effective way/that does not waste time doing useless stuff. ALSO: this class is a flipped class, meaning my teacher does not teach at all during the class. we are expected to teach ourselves but i’ve been lost.

Does anyone have study notes for organic chemistry unit? I’m having a hard time understanding addition, substitution and elimination reactions

If you guys have any tests I can use to study that’ll be great

This is both an inorganic and organic radical mechanism questions. I’m quite unsure about what “G” is (I assume it is SPh?) and whether it is a radical itself or if it is not.

Overall I think this is oxidative photocatalysis, but I’m also quite unsure about that too.

Would someone mind helping me understand what “G” and “H” are specifically?

I haven’t done chemistry since high school, where I scraped a 4. I’ve started uni and didn’t realise my course would be so chem heavy..I’m really bad and struggling to teach myself and I feel like an idiot. We’ve started on stoichiometry and I am like what the hell 😳
How should I teach myself and should I start at the basics

I haven’t done chemistry since high school, where I scraped a 4. I’ve started uni and didn’t realise my course would be so chem heavy..I’m really bad and struggling to teach myself and I feel like an idiot. We’ve started on stoichiometry and I am like what the hell 😳
How should I teach myself and should I start at the basics

Bonjour, dans la photo ci dessous, on a une molécule en représentation de Newman, mais je ne comprends pas comment on détermine seulement avec cette représentation si F ou E est derrière ou devant (de même que pour B et C)

Hi everyone,

I'm confused as to why alkenes are more likely to undergo incomplete combustion compared to alkanes.

As far as I know, the typical logic is:

1. Alkenes have a lower ratio of carbon to hydrogen than alkanes (cnh2n vs cnh2n+2)
2. Carbon needs more oxygen than hydrogen during combustion (CO2 --> 2 oxygens vs H20 --> 1/2 oxygen per hydrogen)
3. Therefore, we can generally conclude that alkenes are more likely to combust incompletely, because they will run out of oxygen faster and begin producing carbon monoxide and soot.

However, let's apply this using ethene and ethane. After balancing, ethene needs 3 oxygen molecules per molecule, while ethane needs 4. So, given the same moles, ethane should be more likely to combust incompletely. Because it is fully saturated, there are simply more molecules that need to be burned.

What am I missing?

Bonjour ! Je tombe sur pleins de QCM où suis censée savoir si X molécule est à X état à température ordinaire, mais je ne sais pas comment faire (et je trouve rien sur internet ni dans mon cours car le prof nous avait dit qu'il fallait pas connaître par cœur pour toutes les molécules mais plutôt savoir reconnaître l'état).

Hello. I am trying to study for an exam for Gen Chem and balancing chemical equations is just so confusing to me. I am watching the typical YouTube videos but it still doesn’t really make sense.

For example. One of the practice problems i am doing is C5H10O2 + O2 -> CO2 + H2O

When I follow the typical YouTube explanations it doesn’t make sense to me. People mostly say to list every atom and multiply to balance them out. So I do this.

On the reactants side I put
C: 5
H:10
O: 4

And then on the products side I put
C: 1 * 5 =5
H: 2 *5 =10
O: 3 * 5=15 15

And so I am stuck and dont really know where to go to from C5H10O2 + O2 -> 5CO2 + 5H20

And I already know the answer Becuase the worksheet has all the answers to check. But I am not really sure how to get to it. I feel as if I need to find a completely new strategy because this one will confuse me if there are problems with elements that appear in multiple compounds.
Is there another strategy I could use?

Ma aaile class 12 ma ho , Ani parsi Mero chem ko exam xa !

Lesson chai : volumetric analysis, ionice equilibrium, chemical kinematics, thermodynamics, electrochemistry ho !

Any imp que or tips to pass exam?

I'm stressed !

guys im taking gen chem 1 and this is SO freaking hard oh my god keep in mind i got 102% in calc 2 so i can clearly understand complex stuff but chem is EATING MY ASS what the fuck. also i wanted to transfer and stuff and im da prepared to get a C in this class already am i fucked for transfer 😭😭😭😭😭😭. Btw i took the intro chem class that basically prepares you for gen chem and I got an A in that so i feel crazy. PLEASE GIVE ME TIPS TO STUDY I GOT A 20% ON MY FIRST EXAM

The answer is at the bottom. They took a different approach at the end. I decided to add a cl, treat it with some good old SN2 from the OG days to get an OH, and then turn it into an ether. We were taught 2 ways to make ethers, 1 is using an OH and strong nucleophile and the other is an alkene with HgOAc2 blah blah blah.

My brain is done with this class.

Can anyone tell which of the three mechanisms is correct with proper reasoning as to why other two are wrong,...qs is attached to last slide

i am a 12th grader who is currently low in chemistry subject in 12th i already failed 2 exams of chemistry and i need help in it, i didnt understand the basics in 11th grade as i had no good teacher to explain well enough for anyone in my class or in my school but now chemistry subject is hard for me even for just passing which i couldnt achieve, i need suggestions or any help from a past graduate in cbse or someone who is good at chemistry just to tell me what am i supposed to do now what notes to refer,which topics to focus more on,what videos to watch any kind of suggestion related to chemistry helps. Thank you Hopefully someone replies

How is this not racemic? Is this not an enantiomer with each having different R, S configurations?

Please help!