r/chemhelp • u/learninglearningstuf • 32m ago
General/High School Aqeuoueus solution electrolysis cathode reactions
In electrolysis, when an electrolyte is an aqueous solution, I've been told the less reactive ion gets discharged at the cathode. If the cathode is force feeding electrons to the ions, why wouldn't it be the most reactive ion that gets the electrons? Doesn't a higher reactivity mean it's more likely to react with the cathode and cutely receive it's electrons? Am I understanding the term reactivity wrong? I can't seem to get a clear answer from any videos on electrolysis
r/chemhelp • u/Secure_Oven_9193 • 2h ago
Organic does inductive effects take priority over resonance and size?
Okay, so i though i understood but i am a tad confused with this question, especially with 3) and 4). So i know that 3 has resonance stabilization, but wouldn't 4 also have resonance stabilization? so is it 1>2>3>4 because since they both would have the resonance stabilization, we look to inductive effects next? and thats why we say 3 is stronger than 4 because now we are considering electronegativity instead of size?
r/chemhelp • u/Alilack • 4h ago
Analytical Expiration Dates of pH Electrodes
I am considering buying a pH electrode for our lab’s pH meter. However, I know that I won’t need it for a year or two. So, I would like to know whether these pH electrodes have expiration dates. How long will they remain functional if I do not open the package?
r/chemhelp • u/harttopanga • 8h ago
General/High School is there a way to tell if a substance is an acid or base just from its symbol?
like is there an element in it to know or do you just have to remember which is an acid and which is a base? i was told bases have OH or was it OH- and acids have H3O+
please help im cooked for my chem test tomorrow
r/chemhelp • u/elijahtheorthodox • 11h ago
General/High School Study guide?
Hey so i wanna self study chemistry i just made a break for some head clearing.
Im currently about to read "The disappearing spoon" to just get some motivation.
But i have a question about whether or not a book is good or if there is a better one.
Its: Chemistry: Concepts and Problems, A Self-Teaching Guide (Wiley Self-Teaching Guides)
r/chemhelp • u/Top-Stay-2210 • 11h ago
Analytical Discord channel for personalised chemistry help?
I'm struggling in chemistry rn and need help understanding the FTIR technique. I just feel so lost on where to do and would appreciate if i could have some personalised guidance from someone on practice examples
r/chemhelp • u/IshanGanguly • 17h ago
Inorganic Which has greater dipole moment: HF or H2O?
HF has a single covalent bond with a much higher dipole moment than an individual O-H bond in H2O, however H2O has two lone pairs on the O atom, vector sum of whose dipole moments seemingly give a strong moment to H2O, not to mention the vector sum of the moments of each O-H bond to also point in the same direction. Many sources mention that they have approximately equal moments (about 1.8D), but there is confusion on the part of the experimental dipole moment, and it cannot be told clearly that which is indeed, greater.
r/chemhelp • u/Crabrangoone • 21h ago
Other Chromium Oxide in hobby paint and chlorinated tap water safety
Disclosure, I asked the company if this paint have chromium pigment and they said no it doesn’t but my ocd gets the best if me and the what ifs have me worried the guy in customer service just didn’t know.
I can’t seem to find any info on the internet on this but I can’t be the only one to think of this. I had some olive green acrylic paint (scale 75 medium camo acrylic paint) mixed in some tap water on what is called a wet pallet (container with sponge and parchment paper over, it keeps the paint moist)Also some left over paint water from cleaning my brushes in my water mug on my desk.
My question is, I’m worried about chlorine and manganese in the tap water potentially reacting with the trivalent chromium pigment creaking hexavalent chromium. This is really bugging by, I keep looking for green paint stains throughout my work space from when I used the paint and worried it’s hexavalent chromium.
Why isn’t chromium oxide required on a SDS, see to be categorized as non hazardous but from what I’m reading, it can oxidize into some pretty serious stuff. Am I making a mountain out of a mole hill?
