Chemistry Definition and 993 Threads

I tried to study chemistry on my own for a while, and I came up with a question. You know, the whole point of learning new subject is to learn core principles, and then understand all their outcomes in things around us. And later to come up with new things based on this principles. Say when...

Normalize function f(r) = Nexp{-alpha*r} Where alpha is positive const and r is a vector I was just wondering if the fact that we have a vector value in our equation changes anything about the solution

In halides, I- is the most polarisable and F- is the least. So shouldn't I- be most nucleophilic ( in aprotic solvent) as its cloud should most easily be distorted and transition state with electrophile should be achieved most easily? Or is polarisability very different from nucleophilicity?

Basically it's a well known reaction, many kids on youtube make it for the views: I am thinking, since AlI3 sublimes can it be put in say tungsten bottle (is this even a thing??) and then used as a rocket the same way Na+H2O or HCL+Al rockets are used - the gas escapes? This phase...

I'd like to do some experiments with flames at different Equivalence Ratios - but I'm confused as to how I can find the Equivalence Ratio for different conditions. Wiki-article So the stoichiometric balance for Methane + Air is CH4 + 2(O2 + 3.76N2) -> CO2 + 2H2O + 7.52N2 Referencing equations...

I'm trying to make a mold because I want to add something to some jewelry. I 3D printed the symbol that I wanted, and tried to make a mold with Plaster of Paris. But I can't take the print out of the plaster, and I don't want to damage it with a knife. I'm thinking ethyl acetate? A quick google...

https://www.nobelprize.org/prizes/chemistry/2022/press-release/ The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Chemistry 2022 to Carolyn R. Bertozzi Stanford University, CA, USA Morten Meldal University of Copenhagen, Denmark K. Barry Sharpless Scripps...

I've seen this before, but it boggles my mind when I try to put it in the context of a boxer practicing his jabs. Just how fast are these individual reactions occurring? (Did I get he right GIF? It's supposed to be the one of muscles contracting.)

Summary: What’s the best way to review inorganic chem in preparation for OC. Assume zero recall on basic college chem. Are there study guides, online courses, etc. for this specific purpose?

Good day all! I have a question about groundwater chemistry on an island. We have datasets over the last 40+ years and what can be seen is that the eastern and western side of the island differ from each other. On the western side there has been a distinct drop in pH over the last decades, and...

Summary: doesn't this decrease entropy ? Cellulose is known for its hydrophilic quality, which can be explained from the polarity of its hydroxyl groups. We all know water can overcome the force of gravity through a piece of paper you put in the water. Correct me if I'm wrong but this is a...

Hello, when reviewing the types of chemical bonds i was a little bit confused about van der waals interactions, in the definition we talk about momentarily disproportion of electrons that provoke a dipole , and then i read that also include hydrogen bonds . I am a bit confused about van der...

I mixed some fertilizer based on a soil test. The chemistry contained Ammonium Sulfate prills (NH4)2SO4, Potassium Sulfate prills K2SO4, Superphosphate CaH4P2O8, trace of Manganese Sulfate MNS04, and trace of Boric Acid H3BO3. I mixed it and wiped my hands on the front of a white tee shirt...

Hello, I just learned the bases of IUPAC nomenclature and I couldn't find a good and reliable resource for problems to practice. if you know one please share it with me . thanks.

Hey guys, not sure if this is the right place for it, but hoping someone can share some chemistry insights on this. I am about to buy some reverse osmosis water filter for my home. However the seller is trying to sell me; Far infrared balls, Mai fan balls, Tourmaline ceramic balls, Alkaline...

Hello there, My attempted explanation/solution is : “Torsional strain is caused by the tendency of the electron clouds in the interacting groups to repel each other, making it relatively difficult to rotate a group towards and through another group, as the repulsive force provides resistance to...

Hello, I have been working on this subject but I am not sure how to deal with it. I am looking to prove how can vinegar attenuate the pain of a bee sting. I have chosen a specific vinegar that is of 6° and 50 ml and Know the molecular weight of acetic acid is 60g/mol. The bee sting contains...

Say one was to create an artificial stable isotope of Promethium as it has predicted applicable properties. What would it’s number have to be? I know Promethium-147 is semi-stable.

hello , i am solving a problem about solubility and the solution seems weird to me , the problem is the following : we are asked to calculate the molar solubility of (CaCO3) with (Ks = 5*10^-9) in water and in a solution of (NaCO3) with a concentration of 0,1M, knowing that (NaCO3) is totally...

There is no laboratory in my school ,looking for best chemistry project ideas for the 12th class students at minimal cost and that can be prepared at home . need suggestions on this,response would be appreciated

I have a chemistry project and my research question roughly translates to: What is the effect of the different metals electrolytic nature on iron corrosion? (In french: Quel est l’effet de la nature électrolytique de différents métaux (cuivre, aluminium, magnésium) sur la corrosion humide du...

I have a chemistry project involving milk coagulation under certain circumstances. One of the circumstances is milk combined with citric acid or pineapple juice. I need to find the chemical formula of this reaction.

The molecule is p-phenetidine

Hello , the problem that i refer to is present when we try to calculate the pH of a solution without any assumption. in a lecture entitled "calculating the pH of a strong acid/base solution " after adding a certain amount of HCl in water we are asked to calculate the pH (the amount of HCl and...

Are all non aromatic carbon chain aliphatic ?

Hello we learned about the chemical equilibrium and how to write it's formula in the case of liquid and gaseous phase , what about a reaction involving different phases ? like this one : how do we write the formula for the chemical equilibrium ? do we just ignore the carbon ,is there any rules...

Hey I'm Fraser, I am a Strathclyde university graduate with a master's in electrical and mechanical engineering. I am interested in furthering my knowledge on quantum entanglement in relation to general dynamics. I am interested in researching its capabilities in ICBs. I hope I can find...

Can someone please tell me what is the chemistry textbook that available about degree of ionization? I use Chemistry the Central Science textbook by Brown. Unfortunately I couldn't find about degree of ionization in this textbook. Degree of ionization is studied in undergraduate of Mechanical...

Is there a general expression for the wave function $\psi$, which describes the electronic properties of an arbitrary covalent bond? For example is it equal to some sort of trigonometric expression?

I really need help with this.

We studied in chemistry that the concept of oxidation and reduction is the exchange of electrons between two chemical substance ,but when i started to study organic chemistry i saw that when we talk about for example the oxidation of a compound it can loss atoms and change his constitution...

Just to keep this from being a long post: I went to a local CSU for Materials Science and Engineering in the fall of 2018 after graduating high school in the spring of 2018. I really like learning about everything that makes up the world around me, and why things are the way they are, and in...

How did you find PF?: via Google Hello everyone, I hope you are doing well? Recently, I’ve been trying to calculate the optimization and Uv spectra of organometallic compounds using the Gaussian software .it’s my first time for the computational chemistry and I am inexperienced . When I...

Hi there, I am currently reading introduction to Chemistry fourth edition by Bauer, Birk, Marks. what do you guys think about this book? is it a good book? I am doubting the quality of the book because I found one wrong statement about the reaction of Alkaline Earth Metals. It said "Alkaline...

Hi there, I've taught high school stoichiometry (limiting reactant, theoretical yield, etc) for about a decade now focusing on both math (such as mol reactant to grams product) and related lab techniques (maximizing percent yield). I would like to expand my curriculum with some good readings...

The 2021 Nobel Prize in Chemistry has been awarded to Benjamin List and David MacMillan, for the development of asymmetric organocatalysis. More info here: https://www.nobelprize.org/prizes/chemistry/2021/press-release/ Well-deserved.

I calculated it and found that is approximately 610Kg needed of CaCO3 to bring the lake pH to a neutral level. Is my calculation right 1st :)? Then if this is right, 610kg of CaCO3 is not that much in a matter of cost or weight to help the bio-life of the lake. I'm wondering if we are applying...

I can choose any topic. The paper doesn't have to be original. Please suggest a simple paper to write which involves math and chemistry. I am in second year university.

Our planet (Earth) has a wide variety of different elements, which at some time had to be generated (presumably in stars) and distributed through space to new forming planets (like ours), when the stars exploded. What is the minimal amount of time needed for this to happen? It has often been...

Hi everyone, I'm curious if anyone knows of a reference book on enzymes that discusses each enzyme's catalytic mechanism(s). I've consulted several books that explain the different categories of enzymatic catalysis but I'm looking more for an encyclopedic reference that explains such...

The structure of the cell membrane is depicted as being formed from a bilayer of phospholipids with their hydrophilic portions pointing outwards and their hydrophilic portions facing each other. But as I look at the histology of the epithelial layer of the epidermis or mucous membranes, I am...

... with the intention of going into novel drug synthesis. It might be a bit of a reach to ask this on a physics forum, but I see chemists among us, so I guess this is as good as any. To those of you with experience in the field, what makes a good organic chemist? What makes a good medicinal...

They know what this equation or formula and what applications it has. I saw in the anime Dr. Stone. Thanks for your understanding.

ion shown: My answer: the following is the answer of the question: I identified the major contributor correctly, but the resonance structures, but the second resonance I drew is missing in the answer sheet. Can anyone tell me why the second resonance structure is not part of the answer...

I was told that there are six resonance structures for SO42-, as shown below. I am wondering why this structure with single bonds is not one of the possible resonance. I understand that it is unfavorable as the formal charges are spread out over all four atoms, but shouldn't is still be a...

Abstract: The electronic Schrödinger equation can only be solved analytically for the hydrogen atom, and the numerically exact full configuration-interaction method is exponentially expensive in the number of electrons. Quantum Monte Carlo methods are a possible way out: they scale well for...

...

Summary:: Hypothetical discussion of a method to turn oxygen into fluorine through the use of another chemical and also discussing the biological effects of fluorine. Hello, I'd like to start this by saying my knowledge of chemistry is extremely basic. I barely graduated chemistry in high...