r/chemhelp • • Apr 28 '25

Other How Accurate is This Pattern?

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4.7k Upvotes

I want to stitch this for my office but I do not want to hang misinformation. Would anyone be able to tell me if these are accurate?


r/chemhelp • • Mar 31 '25

Other I accidentally touched Potassium Permanganate, my skin is brown now? Will I live?

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1.4k Upvotes

I tried Washing it , won’t come off man


r/chemhelp • • May 19 '25

General/High School Please help identify this pin/molecule.

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854 Upvotes

My 11 year old wants to put it on her backpack, but I'm afraid it's a drug or something. I know it's not THC....


r/chemhelp • • Dec 16 '24

Other What's the name of this structure?

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455 Upvotes

Personally, I think it's 2,5-xmas-2-methylcarbinol


r/chemhelp • • Dec 03 '20

Organic Nucleophilic and eletrophilic

452 Upvotes

r/chemhelp • • Sep 16 '25

Organic I marked A, teacher says it’s D??

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378 Upvotes

I saw two competing carbon chains and picked the one which was more substituted. Isn’t that how it’s done?


r/chemhelp • • Jun 07 '20

Chemix now does Biology too

339 Upvotes

r/chemhelp • • Aug 07 '21

General/High School Fire Water. With ether, sodium and water.

328 Upvotes

r/chemhelp • • May 03 '20

You can now add multiple layers of liquid in Chemix

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324 Upvotes

r/chemhelp • • Apr 28 '26

General/High School Is it C or am I crazy? My school insists it’s D.

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300 Upvotes

r/chemhelp • • Jan 29 '25

Organic what is the name?

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289 Upvotes

r/chemhelp • • Sep 02 '19

Recently HK police use helicopters to spread the UV fluorescent substance shown in the picture to people who are joining a protest. I would like to know what may this substance be and is there a simple way to remove it from the skin/clothes? And, is that toxic to human?

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285 Upvotes

r/chemhelp • • May 07 '25

Organic how is this trans?

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260 Upvotes

here’s my thought process:

  1. look at molecule sideways to see double bond correctly

  2. determine higher priority phenyl>ethyl phenyl w/substituent> phenyl so it come out as cis, but my book states trans. which step am i mistaken in?


r/chemhelp • • Mar 28 '20

Teaching Physical and Inorganic Chemistry

255 Upvotes

My name is Dr. Scott M. Simpson and I am a chemistry professor at St. Bonaventure University. I am in the process of posting my lectures to Youtube. Feel free to browse/use them as many of these topics are difficult to understand. I am open to making other videos to explain topics, so please feel free to message me.

https://www.youtube.com/channel/UCNTlj0PT8SOGOuQ3CZ_fkTg


r/chemhelp • • Apr 28 '21

Organic Help needed for naming this SUS compound. A guy posted on Facebook this and I don't know how to name it. Please help

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244 Upvotes

r/chemhelp • • Nov 06 '25

Organic What is the name of this compound? I call it phenylmethanal.

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242 Upvotes

Nome do Chemsketch is benzaldehyde


r/chemhelp • • Jun 11 '20

I recently started making illustrations of reaction mechanisms, mainly on topics covered by undergraduate courses. Check it out!

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233 Upvotes

r/chemhelp • • Mar 03 '21

Other Found this in lab, anybody knows what it is used for?

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223 Upvotes

r/chemhelp • • Mar 21 '20

Stuck at home from COVID-19 and need homework help?

223 Upvotes

Hi, I am a professional chemist (PhD) and I am stuck at home due to COVID-19, and I want to spread some cheer and goodwill and help you out with your homework. My specialties are polymers, materials, and kinetics, but I can also help with gen chem, pchem, or organic chemistry but I might need to refresh myself on some mechanisms or named reactions.

Struggling with distance learning? Have questions on the data you have or how to analyze it? Send them here! Also, I encourage any other professionals willing to volunteer their time to provide their usernames and specialties here too. We'll all learn together but separately.

Stay healthy and go wash your hands!


r/chemhelp • • Aug 27 '18

Quality Post Gentle reminder

221 Upvotes

Now that the academic year has started again (at least in most places), I thought it might be good to remind all the new (and old) people about the rules of this subreddit and to include a few of my own thoughts and suggestions.

  • You should make a serious effort to solve questions before posting here. I have noticed that there are a number of users that have been posting several questions every day and, while people here are generally happy to help, this is not a very efficient way of learning.

  • If you get stuck on a problem, the first step should be to go through the appropriate part of your text book or notes. If you still can't figure it out you should post it here, along with an explanation of the specific part that you are having trouble with.

  • Provide as much information as possible. Saying "I got the answer X, but I think it's wrong" does not give us enough information to be able to tell you what you did wrong. I understand that people are often reluctant to post their work in case it is wrong, but it is much more useful to be able to explain to someone why a certain reasoning is not valid, than simply providing the correct answer.

  • Please post the whole problem that you are having trouble with. I't is often difficult to help someone with a problem "I am given X and I am supposed to find Y" without knowing the context. Also tell us what level you are studying at (high school, university, etc.) as that can also have an impact on what the correct answer might be.

  • Do not make threads like "please give a step-by-step solution to this problem". That is not what this subreddit is for. We are happy to point you in the right direction as long as you have first made a serious attempt yourself.

  • Finally a quick reminder for the people helping. There is no need to be rude towards people asking for help, even if they are not following the rules. If someone is just asking for solutions, simply point them to the side bar. Don't just tell them to get lost or similar.

  • If people make posts that are obviously about drugs, just report the post and move along. There is no need to get into a debate about how drugs are bad for you.


r/chemhelp • • Apr 23 '20

I'm colorblind and have been staring at this for 20 minutes. What color is the number 5 on the pH paper?

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220 Upvotes

r/chemhelp • • Nov 10 '24

Organic Are these two the came compound?

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216 Upvotes

Hi! are these two considered the same compound? if not, then i def just flunked a quiz on stereoisomers. My thought is that they must be since you just flip one and it makes the other…. right??


r/chemhelp • • Sep 19 '20

Other A small teaser of my upcoming Periodic Table and Chemistry App.

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214 Upvotes

r/chemhelp • • Mar 23 '21

Organic Created this Free Ochem Ebook to help students with their studies at home! 📖

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211 Upvotes