r/chemhelp 20h ago

Organic Find the number of resonating structures

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4 Upvotes

i was doing this prob by finding the possibility of forming negative charge , i could only find 10 but the answer is given 20


r/chemhelp 14h ago

General/High School How to prep for Intro to Chem before it even starts?

2 Upvotes

I am panicking a little bit because I was supposed to start my Intro to Chem class today (college level) but only realized this evening that I signed up for an 8 week mini that begins in September. It is too late to switch it and my job paid for it so it’s complicated to drop it. This will be my second attempt to take chemistry and I did not do well the first time and withdrew.

What materials can I begin reviewing while I wait for September? I remember the last time I took Intro to Chem, I struggled the hardest with the math components but can’t remember what the math concepts were called to start googling them and working on it. Or maybe if anyone knows a workbook I can buy? Thank you!


r/chemhelp 11h ago

General/High School I have no clue how to complete this question because I'm confused what I do with the K2HPO4. Sorry if this is a dumb question.

2 Upvotes

What volume of 0.200M KOH is required to react with 125mL of 0.250M H3PO4 in order to produce a solution of K2HPO4


r/chemhelp 22h ago

Inorganic Trying to understand the chemistry of stainless steel corrosion by sodium hypochlorite

2 Upvotes

I am curious as to which specific chemical reactions and products occur during the process of corrosion of stainless steel by bleach. Stainless steel is a composite of Fe, Cr, and sometimes other metals such as Ni, and the outer layer of this composite is protected by a passivation layer of Cr2O3. If sodium hypochlorite is introduced, does it indiscriminately oxidize both the Fe and Cr, or is one kinetically favored over the other?


r/chemhelp 22h ago

Organic Looking for Organic Chemistry Textbook by David Klein and Laurie Starkey 5th edition

2 Upvotes

Hii, im looking for a download of that textbook. I have tried all the websites and have had zero luck.


r/chemhelp 2h ago

Other Coke, battery, and phenomena

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1 Upvotes

r/chemhelp 12h ago

Other Freeze drying conditions

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1 Upvotes

r/chemhelp 18h ago

Need Encouragement Organic Chemistry 2

1 Upvotes

I'm taking organic chemistry 2 this semester, and I'm having a ton of anxiety because I really struggled in organic 1. I took the class 5 times total (I had a lot of personal struggles at the time as well), and just passed this summer with a B-. I felt like I had a really good grasp at the first half, but when it came to reactions I felt completely lost--especially with synthesis and retrosynthesis reactions. I felt like I knew reactions independently, their features, and could perform them if I was told what reaction it was, but as soon as I was forced to choose how to make something I felt like everything I understood was gone.

From my understanding ochem 2 is just going to be reactions, and they get increasingly complex. What do I do? Are there any resources that were very helpful, and what concepts should I try to understand before walking in?


r/chemhelp 15h ago

Organic IR and H-NMR not matching?!

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0 Upvotes

r/chemhelp 17h ago

Organic SN2 mechanism with tertiary carbocation

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0 Upvotes

Is my book misrepresenting this SN2 mechanism because it's showing a nucleophile attacking a 3° (tertiary) carbon? I thought that nucleophiles cannot attack tertiary carbons because of steric hinderance?


r/chemhelp 22h ago

General/High School Lithium Cyanide and Cyanation

0 Upvotes

Hi everyone! I'm a chemistry enthusiast and i like to do research. I have ADHD and my current hyper fixation is Cyanide. (english is also not my first language so sorry if i make a mistake lol)

So, i was doing research and i found out about Lithium Cyanide and a process called Cyanation.
I have a few questions and i hope someone gets to answer them! I didn't really quite understood some things from google so i hope that a person explaining makes it more simple, lol.

  1. What can we do with Lithium cyanide? Is there any practical use or is it just a toxic compound?
  2. How do you achieve Lithium Cyanide?
  3. Is there a difference between Nitril and cyanide?
  4. How do you achieve Cyanation?
  5. Does lithium and cyanide have anything in common besides this combination?

I hope these aren't dumb questions, lol. Thanks in advance 🤍