Chemistry Definition and 993 Threads

hello! I am trying to make a device that will improve reproduction rates in certain microorganisms that I am studying. They reproduce fastest under shorter wavelengths, specifically best at blue light. Any ideas for devices or materials that could help out would be appreciated! An idea I had was...

I recently noticed that my mouth is heating up after eating some biscuits named as Energy Biscuit. It's not the taste because I can feel it by touching. It's very weird as I have never experienced it before when eating biscuits. So why is this biscuit heating my mouth so much? The product...

I was feeling very bored so I wanted to play with my surroundings and I had: Crafting glue: And Rubber Dust: Near me so I (for some reason) mixed them together and rubbed them on my hand. After some time it started to take a spherical shape. It lost the stickiness of glue and started acting...

I took water from my schools water recycling filter. It looks like this (image 1): After filling my water bottle. I didn't drink from it and just left it untouched in my bag. After few days I took it out and it looks very unclear and some dust like metarials are floating inside the water. This...

Does anyone know where I can find all the ionization energies of Germanium? hbcp.chemnetbase.com shows only the first 5 and winter.group.shef.ac.uk only the first 21. I need them because I would like to reproduce a plot of the ionization of Germanium in a plasma. Since this plot exists I assume...

Taking into account the Rayleigh scattering phenomenon, assuming that the atmosphere is 1 bar, how would the light from the G2V-type star interact with this kind of environment? Could the colour of the sky even alter despite the fact that there is a significant amount of sulfur dioxide in the...

I do know the shapes of the individual orbitals but as a whole, I'm confused as to how to visualise their positions...Also how can we predict the trajectory of an electron or can it not be predicted because of Heisenberg's uncertainty principle

OK, My 1st post. I am going to learn chemistry because: I know electro-mechanical engineering, but I don't know why 'stuff' behaves like it does. Why my epoxy has different solidification times? Why can I not burst it with a specific EM spectrum to react it immediately? Why my garage door genie...

A vibration moves along until it has moved too far or there is no other objects to travel to, so does that mean it could carry electricity or something chemistry related?

Hi all, I'm having a course on computational chemistry, as part of a bachelor curriculum. We have a project that is due to 4 weeks and I'm failing to find an interesting idea for this project that has to be done using Python. It can be anything, as long as it involves chemistry and coding...

Hello, I have a degree in chemistry but recently started with radiochemistry work and so I figured the best place to get myself up to speed with the physics related areas is this forum. I used it a lot on another account more than 10 years ago and have learned a lot.

First I have seen a few forums dotted about covering this subject already, however I couldn't find exactly what I was looking for so I apologise if its somewhere on here already. I am trying to calculate the AFR value for pure ethanol. I am only including oxygen in the category of "air" due to...

THe answer is supposed to be (B) but I'm not understanding properly I initially chose A - to form an alkaline buffer, the # mol of acid should be half of this. But this doesn't seem to be the case I don't understand why the mol of base in this case should be 5x the mole of acid your help is...

https://www.newsweek.com/basic-principle-physics-wrong-oxford-university-scientists-say-1874984

My name is Ron Werner, Dutchman, living/working in Norway since 1992. My main interest is geology and I have worked for several museums and mineral-dealers during my life. Since 2000 I have worked for the Evje og Hornnes geomuseum Fennefoss in Evje, in the south of Norway. It is a small museum...

I'm working for a project with a goal of analyzing data obtained from a device that extract data from bodies of water, such as bacterias found, the chemical levels, etc. I've been instructed to use existing equipment for it to work. What I've been recommended to use include: bateries, solar...

TL;DR Summary: transfer function Hello, I have a doubt on this exercise from my post graduation course: ____________________________________________________________________________________________________ The transfer funtion of a series RL circuit is given by: Determine the answer y(t) for...

Degree in chemistry and at one point was a physics and mathematics double major, but life intervened. Never got to finish but still read and work on novel amateur theory. At least, what I would call novel and amateur. My focus is on putting together theory on space-time and quantum field...

I tried to calculate the energy of an H-Atom with the one electron integrals. I tried to solve them numericaly but it didn‘t worked. Thats why I am hear.

I went to Subaru for period maintenance checkup. They told me the car was due for CVT fluid replacement which was done every 5 years or 40,000 miles. It's already 7 years even if the mileage is only below 20,000 miles so I let them go ahead. The service advisor told me as time passes, the...

I’m currently fascinated by the the element iodine. Hoping to find out more about this topic, and other elements.

Experiment equation: Zn(s) + 2HCL(aq) -> 2ZnCl(aq) + H2(g) a) If the the mass of zinc solid used was doubled, what effect would this have on temperature change? Answer: if mass of zinc increases, there will be an increase in zinc particles which increases the collisions between particles and...

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I've figured out that both compounds have 4 unsaturations. The fact that they are insoluble in water makes me think they might have a benzene ring. When bromine water is added (I found out online that it's Br2 in water), perhaps some hydrogens from the benzene ring might be replaced. However...

Hello everyone. I would like to experiment with solar air conditioning, wich may work as a massive dehumidifier. I have the idea of making a suspension/solution of Calcium Chloride and / or some sort of Lithium dessicant salt in some sort of oil, run between a solar boiler to evaporate water,on...

Hello all! I've joined your forum here because I have some (what I believe are probably) basic but precise chemistry questions and I don't know any chemists or chemistry professors (or even chemistry students) whom I can ask. Recently, my car's catalytic converter's been giving me some trouble...

Ok so I’m going into my second year of college and I’m starting to learn more advanced chemistry (pray for me🙏) I’m currently on the topic of D-Block elements and I was already aware of electron configurations and how to write them out… however what I have never come across prior was the use of...

Hi, I struggle to calculate the unit of the rate constant that is [m^3/sec] rate constant of excitation by electron impact is as follows: where, e=charge of electron [Coulomb], me=mass of electron [kg], ε=energy [eV], σe(ε)=cross section for electron impact [m^2], f(ε)=electron energy...

The first thing we notice is that we have a metal and a nonmetal, so we would think about an ionic model. These elements form the ions ##Al^{3+}## and ##S^{2-}##. These ions form a lattice structure and we get an ionic crystal. But apparently no bond is perfectly ionic or covalent. The...

How did Rutherford prepare the gold leaf for the gold leaf test (at that time)

I trying to learn chemistry as a physicist. Any advice? What books would you recommend?

Hello everyone, I am seeking assistance in preparing a Titanium dioxide solution in oil. Below are the chemical compositions of the solution: Titanium Dioxide (TiO2): 20% by weight, with the product name Tronox CR828. Solvent/Oil: Isoparaffin, constituting 75% by weight, with the product name...

Hi everyone! Hope you all are doing great. I'm currently starting a new course mixed with Chemistry, Biochemistry, and Physics-related to Nurse anesthesia. While reading about State function a question arrived on my team. We all agreed that a State Function "is a property or characteristic of a...

Hello! I am Logan, I am a student and i like chemistry! I came here because I was searching for an answer for a reaction I did but found nothing elsewhere.

I can't find my mistake, can you help me? I suppose that in 1000g of solution there are 50g of solute and 950g of solvent. Then I find the molality $$m= \frac{50}{MM} \cdot \frac{1}{0.950}$$ So I can find the Molar Mass of the compound using the relation $$\Delta t=K_{cr}\cdot m \cdot i$$ where...

I would like to know how can we determine or tell from the diagram that the electron domain is tetrahedral and molecular geometry is bent/ v-shaped? thanks

I would like to print a nice PTOTE, written in Latex. So that I could make small modifications before printing it. I have checked on the Internet, but surprisingly couldn't find any really nice one. Ideally, it should contain information like the fusion point, possibly crystallographic...

Hi Everyone! I am an upperclassmen undergrad of a biol background, with mainly course training in biochemistry and molecular biol, and taken chem like o-chem and a-chem, and introductory physics. I have three short term summer projects at top 5 institutions in the past and in the field of...

Hello, I have a doubt in a question from a chemistry MIT course: My attempt is attached. The formula given in the lecture is D = Do * exp(-Ea + Delta Gn)/RT However, they don't explain what Delta Gn is, I suppose it is Gibbs free energy, but as the statement doesn't give any other extra energy...

Hey all, Long time forum lurker here. There's a lot on my mind, but I will do my best to keep it concise: I'm an undergrad chemical engineering student, just starting my junior year. I have found myself at somewhat of a crossroads concerning my career pathway: Originally, my plan was to finish...

This video is an interview of Bill Martin (Martin wikipedia link) (one of the godfathers of modern origin of life chemistry) by Jitender Kumar about several origin of life issues. He has a lot chemical knowledge and expresses it clearly. Interesting to me, he places the formation of membranes...

I’m starting my PhD in Organic Chemistry this Fall. I want to review all of undergraduate Organic Chemistry and I’m trying to develop a plan of attack. I did alright in lectures but not perfectly and did quite well in labs. I don’t want to be bombarded in grad school and want to have a proper...

So it’s not so much a question solely based around chemistry as a subject it’s more about you. The individual reading this. I want to know why you have such a great interest for chemistry. Is it just something you find fun?, is it the deeper understanding of the universe you enjoy?, is it the...

This is a confusing subject for me. It's like only getting half of the story. Reading physics but not understanding how it works in chemistry makes it nonsense to me. Imagine we are creating a silicon-based semiconductor. They have covalent bonds between them, with each silicon atom having four...

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...