Science topics: Chemistry
Science topic
Chemistry - Science topic
Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry is concerned with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds.
Questions related to Chemistry
Hello everyone, my research is about leaching of gold from end-of-life printed circuit board by using Fe2(SO4)3 solution and the leachability was approximately 30-40%. Hence, i have some questions to ask.
1. Could these reactions be spontaneous in my solution?
Au + Fe3+ --> Au+ + Fe2+
2Au + SO42- + 2Fe3+ --> Au2SO4 + 2Fe2+
2. If not, in your opinion, what reactions might occur in my solution for gold leaching?
Can someone please recommend me a textbook for wastewater treatment explaining different techniques and their related physics and chemistry?
We are currently using Hemavet and Vetscan but they are both very old and we are looking to upgrade. Thanks!
I am DO levels in stagnant waters from a stream mesocosm experiment. During the non-flow periods, DO saturation measurements are reaching maximums of 300% (26 mg/L, 21 degrees C). The flumes contained high amounts of filamentous algae and high light inputs, which might partially explain these values. Nevertheless, we are afraid that oxygen bubbles might be generating an artefact.
We are wondering which are the maximums levels recorded by other researchers in similar conditions?
Thanks all for your help and time,
It sounds that shorter λ (more energy) makes the wave more powerful to go through a specific thickness of the material, but the weaker wave does it better. How are the interactions of the wave with the molecules?
Hello everyone,
I have a serious problem with coating the Pd/C catalyst uniformly on the glassy carbon.
I prepared the Pd/C ink by adding 20 mg of Pd/C into 9 mL of DI water. Then I sonicated it for 10 mins. I added 1 mL of IPA into the mixture and sonicated for another 10mins. I pipetted 5 uL of the ink on the center of glassy carbon (Diameter=3mm) and dried it in the air. To avoid any dusk from the air, I used a biker to cover the glass carbon. But I can't get a uniform layer of Pd/C catalyst on glassy carbon. Here is the picture of the Pd/C film. Can anyone help me with this problem?
Thanks,
Jay
I am looking for an article that talks about the direct interaction of a nanoparticle and sars cov-2, but most of the articles talk about target proteins attached to gold nanoparticles, but I'm only looking for the interaction of sars cov2 with the nanoparticles. but I can't find that paper if exist.
(am trying to see the interaction in a solution of gold nanoparticles stabilized with povidone to see if they form clousters or how they interact in general)
When I dipped a copper plate into a heated NaCl solution, a precipitate of copper was found in the solution.
What is the real chemistry behind this?
How the journal evaluators examine the work and the reproducibility of results?
Influence of ligand on an heterogeneous catalyst surface reactivity
Good afternoon, I am a student of ING chemistry, could you help me with information on the subject of Biorefineries for my thesis.
I've been looking for some of these sporadically here and there, and have not had any luck. Trying to do SN2 chemistry with dichlorophenylphosphine to produce diaminophosphoranes. Specifically, I'm looking for anhydrous aniline.
Hello,
Now a days, paralleling of batteries is being done among different chemistry of batteries. Suppose, if I connect lead and lithium batteries in parallel. What will be the current distribtuion and voltage profile of the system. I am searching for literature about it but could not find exact information.
Can some one help me?
Thanks
My research deals with tertiary amine but my background is not chemistry, so I would like to learn more about amine. Any helpful suggestions will be highly appreciated. Thank you in advance.
When it comes to choosing a good journal, it has always been debated which one is more important? Impact factor (IF) or journal quartile (Q)?
I give an example, you have three following journals, which one would you choose?
1- IF: 1.3 & Q1
2- IF: 2.5 & Q2
3- IF: 3.9 & Q3
Please select one of the three journals above and give a reason for that.
How can I get involved in writing an article with someone else?
Does anyone want me to participate in writing a review article?
How?
Is there a way to dope or combine the FeSe alloy onto a MXene (Ti3C2Tx) which can be used as a electrode for energy applications?
how can I find a common related project between chemistry (polymers or biomolecules) and mechanical engineering( for example fluid mechanics )???
Hello everyone:
I am looking for a simple software program to model chemical bonds. The purpose is to generate a high-quality graphical abstract for a top leading journal in the field of chemistry. I am not interested in professional programs like Photoshop as I don't have enough time to learn. Any suggestion?
Thanks in advanced!
Hello All
My question is how can we tell if one functional group of an additive is good for trapping charge (electrons) without causing charge accumulation ?
jcr based impact factor not the other one.
I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is 5cm (these conditions are already complex that I would not like to know if in their research they obtained that the higher the density, the higher the high voltage must be or if there is any relationship because the electrospinning worked twice but I did not know the density (it was more than 20w/v) and now that I try to find the density trying No I can find it. the solution is pva,i already tried with 20,25,30,35,40 (w/v) without any dopand. i should tried with w/v less than 10w/v? (i dont have a bomb).you can check the video o from one of those times that worked. and the drop is de pva with silver nanoparticles.but now i only lokking for pva electrospining without something. the power supply is a half of medium wave rectified
Hello fellow Template searcher,
I was looking for Analytica Chimica Acta Template but I could not find it anywhere. So I decided to make one my own and share it. Enjoy all the styles that I have created.
This template could work for most Elsevier journals.
Thanks,
Viraj G.
Some Oxford Nanopore kits have Primers with 5 ' modification that provide ligation to adapters without the need for ligases (ligase-free method), as in 16S barcoding kits. Does anyone know what modification this is or the chemistry involved in the process? I'm very grateful if anyone can help me with this information. Thanks.
Does anyone has an experience with sodium tert-butoxide? How dangerous it actually is?
Do I need to use a glovebox while weighting and handling it?
Do I have to dissolve it in THF at -30C or room temperature will also do?
How do you store it after the can is opened?
We have 100g of sodium tert-butoxide in total, the planned amount for my synthesis is ca. 1.5 g.
I am interested Research in Glass Chemistry. Expert should please drop information here on where i can have the best supervision, studying under an expert in this aspect of Chemistry.
Thank you
I am working on polishing abrasives. I need to do few characterizations ? which can provide the on time surface chemistry of substrate with polishing abrasive during optical polishing. I would also like to know the physics behind it.
In what case would a reaction rate always show direct relation with activation energy or would it always be an inverse relation? Is it a indirect relation, inverse relation or both case can hold? (Please provide supporting resource, thank you).
Hello, I am a 3rd year chemistry student and I'm writing my project report on computational chemistry. does anyone know how PBEsol improves upon the PBE functional?
Thanks in advance
I have produced oleum by adding sulfur trioxide, SO3, to sulfuric acid. It mostly contains disulfuric acid (also called pyrosulfuric acid) but i think this method is not suitable for laboratory purpose so is there any feasible procedure for the synthesis of oleum for laboratory purpose?
Suggestions will be highly appreciable.
Can anyone recommend some any software/models available that can predict substance reactivities and the reaction yield under a specific set of reaction conditions process and proposing pathways to synthesize target molecules from a complex mixture?
Chemistry is frequently termed the "central science". As such, chemistry is expected to play a major role in fighting the coronavirus. For example, hand sanitizers and drugs are all based on chemistry. What contributions can chemists make to fight COVID-19?
Full discussion of this project topic
I am working on my research proposal on the topic, "physical proximity and technology-enhanced collaborative learning in Chemistry. And am going to use the topic matter and change, using CK-12 foundation.
So I know some metal-insulators (ex VO2) have thermochromic infrared-reflective properties, but most of these are insulators at low temperatures and conductive at high temperatures. Some perovskites conduct at low temperatures and insulate at high temperatures, but I haven't found any that show significant thermochromic properties and have a transition around 10C. Does anyone know of materials that satisfy these criteria? The temperature range doesn't need to be exact.
Hello,
I‘ve got a problem that bugs me for two weeks now but I‘m clueless as to how to calculate the pH so I hoped someone here could assist me. Say we have got a salt made of of a weak base (pkb = 9.37) and a weak acid (pka = 3.98) with a molar concentration of 0.06M and then add an excess of the said weak base (additional 0.02M), how would I calculate the overal pH as I cannot apply the Hasselbalch equation.
Thanks very much in advance.
When I tried to mix a sodium metabisulfite solution with sodium hydroxide solution, the mixture solution quickly became turbid. Before mixing both were clear solutions. Please help explain the chemistry for this observation?
i am trying to formulating one formulation but the problem i am facing is after formulating and adjusting it's pH, when i try to check pH after 7 days it is getting down towards the acidic side.
How can i stop this? which buffer or combination of buffers i can use ?
I want to know about nanotechnology from beginning to professional. Thus I want some book in this area
A question is about positron chemistry. Does the pH of an aqueous solution affect the lifetime of positronium (Ps)? The following references reported that the interactions between Ps and MnO4- was almost the same at pH=2, 7 and 12.
- V. I. Goldanskii, et al., "Observation of positronium reactions in aqueous solutions", J. Experim. Theoret. Phys., vol. 12, pp. 1026 (1960). http://www.jetp.ac.ru/cgi-bin/e/index/e/12/5/p1026?a=list
- T. L. Williams, and H. J. Ache, , J. Chem. Phys., vol. 50, pp. 4493 (1969).
Are there any other similar examples? I wonder if it is correct to assume that the lifetime of Ps is unaffected by pH. Or conversely, are there any reports that the lifetime of Ps changes with pH?
Its a colloidal solution of nano materials and AlF3 forms during the reaction and its still exist in the sample even after water washings.
I am using finite difference method to discretize the parabolic equation (explicit method), but confused about the chemical reaction term. Solving the generic equation for i specie involves a couple of species in the kinetic reaction equation since it is reversible ( Ex: A+B <-->C ). What is the best way to conquer the complexity in this manner? should I go with separation method and solve diffusion and reaction term separately. I am not quit sure if it is applicable. Thanks in advance.
The oxidation of chloroform is dangerous because it results in phosgene formation under exposure to UV light. Along with the minimization of UV exposure, this reaction is usually prevented with 1% ethanol by mass (or less commonly, amylene). I find this information everywhere online, but never find a clear explanation of why this is the case.
Since isopropanol is so similar to ethanol, how come people don't use it to stabilize chloroform? Does it not work? Is it because its less volatile than ethanol? Does the prevention of phosgene primarily work in the gas phase?
Also, what would happen if the concentration of ethanol was increased from 1% by mass? What would be the problem with this aside from purity concerns? Would the same concerns apply to isopropanol if it does stabilize chloroform?
To date, I have had the opportunity to explore several open source and private software like MFiX, Fluent, Sim-flow, Barracuda VR, PHOENICS, etc. I want to investigate 3D, hydrodynamics (include particle behavior), chemicals and radiation heat transfer maybe.
But I saw different problems when I tried to importing geometry as STL on each software.
Which software are you using when you solve this type of analysis?
I was asked to include Stewart acid-base chemistry into a lecture I have and then I became very confused when I tried to read about it. It is there stated that it is the ion gap between positive and negative ions that creates pH changes by interacting with water. A negative value will for example lead to that H+ is donated from water to neutralize the charge difference. What I do not understand here is that it is impossible to take H+ from water without creating OH- at the same time. This would violate the law pH+pOH=14 and it will also not help to neutralize the charge difference. Is there anyone else that understands where OH- go in this case? Is it going to neighboring tissues?
Is it possible to calculate entalphy of LiBr/H2O or another solution if we know correlation of specific heat without using any software?
What happens when HF and SiO2 react? Will other toxic / hazardous substances be created as a side product? Thanks!!
In a few reference books of environmental engineering is mentioned that maximum acceptable concentration of nitrate is 10 mg/L as N. What's the meaning of "as N" in this unit of measurement? What's the usage of it?
Thanks for your assistance
In the structure of many drugs, there is a carboxylic group
What is the significance of this group? Why should it exist in the structure of a drug?
Do you know any article or book or reference about this subject?
Thanks a lot
The common method for phosphorus solubilization efficiency measurement of soil microbes is zone formation in agar media (generally Pikovskaya media) but this is a qualitative study. However, there is also a liquid culture method with insoluble phosphorus in liquid media. The estimation of available phosphorus by ICP-OES is quite promising and precise.
The cleavage cocktail is composed of Phenol/thioanisole/water/TFA/triisopropylsilane. I only prepare 10 mL cocktail per peptide but can the activity of the cocktail prepared at 100 mL last for a week?
I prepared PVDF in a very regular way by dissolving it with stirring at room temperature
but when i placed it in vacuum for eliminating the bubbles and trapped gases it started to burst and splash
Does it happen that one has experienced this as well
Is there any reason for this behavior ?
Hi,
I'm a student in an engineer school in chemistry. I have to do some research about encapsulation for pharmaceuticals applications.
However, there are 2 characteristics about capsules that I can't find anywhere...
What are the thickness and porosity required for capsules for pharma. applications ?
Thank you in advance,
Have a good day !
To have the desired grain size in 6061 and 6063 Al alloy, what should be the minimum % of Ti and B pick up and what is the chemistry/metallurgy behind that?
Any significant progress in the design or innovation of solid catalyst for biomass hydrolysis and sugar fermentation into alcohols in a biorefinery? If yes, I would like to have some recent updates regarding that subject. Thank you all
Hi everyone,
I am doing an allantoin assay in urine and all the protocols seem pretty vague. I am currently using this website which seems to be the most helpful:
It mentions that I use 15 mL tubes, but since I am boiling the samples should I use glass tubes with a cap to prevent escape? Or can I just use plastic tubes like the ones here:
Thank you!
Is any way or method to seal agarose pad or channels fabricated agarose gel pad to glass slides as like we do plasma bonding with PDMS to glass slides?.
Polyethersulfone membrane are generally hydrophilic. How can I explain this in terms of chemistry, molecular structure and functional group?
For those of us in chemistry, environmental science, civil engineering, industrial chemistry, analytical chemistry, chemical engineering, biotechnology etc this paper might be helpful. Link is below
im looking for a diy at home (home lab) molecular magnet in a chemical suspension that is stable at room temperatures and cheap
Need to form uniform coating of ZnO with readily available ZnO powder on a substrate. So which liquid solvent I need to use and which procedure I need to follow to prepare such solution? Very new to field of chemistry. Please help
It is known that scientific knowledge is replicated each time at more unusual speeds, however, humanity expects more from our scientific work, that is, solutions to problems that have accumulated and that it is necessary to solve to improve the quality of life . It would be good to reflect on those expectations.
Environmental pollutants and hazardous are major issues through which the modern world. Among all the environmental pollutants and hazardous materials how much contribution is from chemists (out of 100%) lets put rough estimate.
Environmental pollutants and hazardous are major issues through which the modern world is suffering. Among all the environmental pollutants and hazardous materials how much contribution is from chemists (out of 100%) lets put rough estimate.
I have been thinking about a material that was made 6 months ago, which is a tetramethylsiloxane linked to a thiazolidinedione and finally to a naphthalene, but I can't find the original paper (if someone can find it please tell me) but that material had a time of duration of 2 hours until the bond of thiazolidinedione to naphthalene is broken and the material is no longer hard but I know it is an isomeration but the bond does not know why it occurred, could someone tell me that defines the time of the bond in molecular switches or is there any related role please?
I have a difficult to dissolve drug, previously I used DMSO to dissolve it but I want to avoid the toxic effect of DMSO, so I am planning to dissolve it in methyl-cellulose and use tween 80 to emulsify it. Can I prepare it and use it within a week or should I prepare it everyday and use it freshly.
Thanks a lot,
Sarah
Greetings
Which of the following majors is more suitable for studying at international universities for the master's degree in chemistry? Please apply the following items in your final answer: 1- Average income after graduation in the United States or Europe and 2- Ease of admission to international universities 3- Number of jobs available after graduation 4- working in the field of medicine and pharmacology etc.
- Medicinal chemistry
- Organic chemistry
- Pharmacology
- Nano Chemistry
- Analytical chemistry
Dear colleagues!
At the moment we are looking for "nice" reactions employing BuLi solutions for our practical training at the university. We aim to expand our five standard BuLi reactions to a broader field.
Therefor if you know suitable reactions for that purpose please write a short answer. Links or literature citations are also welcome!
"Didactically valuable" reactions with simple starting materials would be of special importance.
Thank you very much!
Eric Täuscher
Could the presence of ligand on a catalyst surface reduced the reactivity of its surface? If yes/no, please explain why?
Recently, I came into contact with a new discipline named chemo-mechanical coupling. I found that chemo-mechanical coupling phenomena exist in many research areas, ranging from development of advanced batteries, biomechanical engineering, hydrogen embrittlement, and high temperature oxidation, etc. Although it is very important in engineering field, I can't know the main mechanisms of coupled chemical and mechanical interactions. Can you give me some suggestions? Such as, some related publications or research project. Thanks very much.
In my personal experience I have find the higher rate of sprouting when fresh cow dung is applied on the top side of cutting what might be its reason.
How have collegues overcome inertia to the introduction of alternative practical procedures in high school/seconday school chemistry lessons?
These are difficult times for presenting practical work to students in schools. Social distancing and cleaning of equipment to reduce the spread of the virus has meant that the amount of student practical work has been reduced, even stopped in some schools in the UK. By alternative procedures I mean microchemistry techniques, “green” chemistry alternatives and specific practical designed to challenge the misconceptions which abound in our subject. Misconceptions arise because we are dealing with particles, which are so small they are invisible to the naked eye, which may be electrically charged and are in constant random motion, colliding with each other..
Reasons provided by teachers involve constraints set by National Exams, bought-in courses, Textbooks, lack to continual professional development (CPD), cost of equipment and chemicals, lack of inspiration and encouragement from education manager and suitability of the room being used. You may suggest more.
Do you finding writing in peer-reviewed Educational Journals useful?
Do you find non--peer reviewed social media such as Twitter or Facebook, reaches far more teachers and has more impact than Journals, becaue it is short snappy and attention grabbing.
I would like to hear your views.
I'm writing a chapter about the nitrogen cycle and discuss the different forms of reactive nitrogen such as NO3 and NH4. I also have some soil places where I discuss soil cations and others where I discuss plant nutrients such as "In a study with Sphagnum spp., Ca and Mg foliar content decreased as N deposition increased..." When should I show ionic charge? Thanks.
I have a 200 mg/ml ampiciline solution, how much should i add to 300 ml of LB medium to get the final concentration of 40 ug/ml?? How much bacteria (in ml) should i add to 75 ml of medium to dilute the culture 50 times??
Hello everyone,
I have 5 Samsung 21700 - 50 E (NCM chemistry) cells. I want to do basic charge and discharge by connecting it in series. Does anyone know if there is a cell holder available online for single cells? Or how to connect these cells and make contact?
Thanks in advance
I need to get BrHPP for expanding Tgd cells, so if anyone knows about a biotec/chemistry company that has it commercially available I would appreciate the information.
Thanks!
Study of different types of high school chemistry teaching methods in California
Or Texas or other states
Hi every body,
I have tried to synthesis aliphatic isocyanates from their acylazide compounds based on Curtius rearrangement. Based on articles, the converting of acylazide to isocyanate must be done through a simple thermal treatment in toluene or benzene at 1-2 hours and via the evolution of nitrogen gas during reaction. However, I have repeated it many times and no isocyanate is formed after reaction. Could you please share your experience with me?
Unfortunately, I found no repeatible results from articles.
Thanks in advances
Good evening,
I am looking for methods according following topic:
Vegetable oil (raps) contaminated with hydrocarbons (e.g. motor oil) shall be purified and separated from hydrocarbons. (Usage for in-situ soil remediation)
Thank you all in advance, I am looking forward to your ideas and suggestions.
BR Paul
How is chemistry taught in schools in the United States?
A comparative study of high school chemistry education
Questions regarding biotechnology and microbiological and bio chemistry DEPARTMENT practically project working my contacts number is 8248413604
Chemistry is frequently termed the "central science". It underlies the foundation of modern civilization (drugs, plastics, textiles, dyes, fertilizers etc.), but the public perception of chemistry and chemicals is often negative. What can we do to overcome public misunderstandings of chemistry?
Hello,
I would like to calculate the monomer molecular weight of cellulose acetate butyrate (cf. attached figure). The average molecular weight of the polymer is 30000 g/mol. However, the polymer bears different residues (Acetyl, Butyryl , and Hydroxyl groups) and the extent of labelling is given as mass fraction in the datasheet as:
12-15 wt. % Acetyl
36-40 wt. % Butyryl
I assume the (average) remaing 43.5 wt. % are hydroxyl groups? There is no more info on that.
How can I calculate the average molecular weight of one monomer?
My team and I are curently working on a project is focused on preventing microplastics and collecting plastic particles up to 2 * 2mm. Our biggest concern is harming sea life and destroying plankton. I hope if you could advise us in which direction to go in our research. Is there a possibility that the filter / mesh and microplastic can be transformed by a biochemical process into something that would not harm sealife?
My team and I are curently working on a project is focused on preventing microplastics and collecting plastic particles up to 2 * 2mm. Our biggest concern is harming sea life and destroying plankton. I hope if you could advise us in which direction to go in our research.
Is there a possibility that the filter / mesh and microplastic can be transformed by a biochemical process into something that would not harm sealife?
I am not sure if any one study on this topic. It has been observed in certain cases that success-full researchers have poor academic record. These are exceptions, I am interested to know any study on this topic. Please also cite examples that shows negative or positive examples. Ideally there should be high positive correlation, if it is not than why?
I mean if person got good grade/marks or rank at school/university level will be a grate scientist. For example if topper of JEE (top exam in India for getting admission in engineering college) join research, he/she will be best scientist in the world.
I am new to ELISA and I need help in the formulation of a wash buffer. There are several components to the creation of this buffer, however what I am having trouble with is diluting a stock solution of (Na2HPO4*7H2O) to the desired reagent (Na2HPO4*12H2O). This buffer requires 2.9 g of Na2HPO4*12H2O. I am mainly unsure of whether this adjustment is necessary? Since the reagent will be dissolved in water to create the buffer.
I would greatly appreciate any help!
Hello,
I did a oxygen plasma surface treatment of a polydimethysiloxan surface. i coated it with two different materials and the bonding improved significantly with one of the materials.
the other material wasnt affected at all by the plasma treatment.
Now i want to draw conclussion about the polymer that are used in this materials. Which kind of polymer bond with a oxygen plasma treated pdms surface?
I think the material with the improved bonding is a silane-terminated polymer, but i am not sure about it.
Please let me know if you got some knowledge about this topic or any hints for me
Thank you
If I dissolve 35 g of NaCl in 100 ml, what will be the approximate specific gravity?.
Is it 1.35? or is there some trick?
I read that saturated NaCl soltion has specific gravity of 1.2.
Also I read 35.9 g of NaCl can dissolve in 100 ml of water (which will approximately give 135.9 g/100 ml solution.
it means 1359 g/L, which means 1.359 specific gravity.
I am bit confused. (did I do a mistake?).
please help me.
Hello all
Thanks for answering my previous questions. I am making perovskite LED and intend to use PEIE on zinc oxide layer as ETL. But I am not sure what version of PEIE to us. There is the one with Mw 70000 g/mol which is not available , but the one with Mw = 110000 is available. But I am reluctant as I do not what effect high molecular weight will have on the performance of LED. I anyone could guide me with this it would be helpful.
Thanks
Jitesh
Chemical engineers translate processes developed in the lab into practical applications for the commercial production of products and then work to maintain and improve those processes. They rely on the main foundations of engineering: math, physics, and chemistry (though biology is playing an increasing role). The main role of chemical engineers is to design and troubleshoot processes for the production of chemicals, fuels, foods, pharmaceuticals, and biologicals, just to name a few. Chemical engineers work in almost every industry and affect the production of almost every article manufactured on an industrial scale. They are most often employed by large-scale manufacturing plants to maximize productivity and product quality while minimizing costs.
Students (max of 5 student per group) are asked to write a 10-15 page essay (inclusive picture)
emphasizing the the critical contribution of chemical engineering to a pathway to sustainability
Submit your article to the google classroom in pdf format