Questions tagged [chemistry]

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48 views

How long will it take to anneal at a lower temperature?

Someone is trying to anneal a brass casting to minimize the segregation of Zinc. He likes the results of annealing at 400 Celsius for 3 hours, but the high temperature produces problems with residual ...
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0answers
33 views

How much electricity does it take to polarize specific types of insulators?

as I hope you know, electric polarization is when you put an insulator in an electric field, and the nucleus and electron cloud go in an opposite direction. https://www.priyamstudycentre.com/2020/02/...
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1answer
56 views

CO2 production from sugar [closed]

Greenhouses often use burners for CO2 enrichment, which requires a source of liquid propane or natural gas. The yeast fermentation process can also be used to create CO2 for a greenhouse by supplying ...
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0answers
50 views

Method of separating oxygen from a mixture of oxygen + carbon monoxide

I have a 99,9% oxygen, with 0,1% is CO. Is it possible to separate the CO from oxygen in this mixture? The closer the percentage to 0 for CO, the better. I've read about separation of oxygen from air, ...
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1answer
21 views

Balancing Equation of Octane in combustion Chamber

Hey guys I am trying to balance out the combustion equation for reactants: Octane + Air with products: CO2, H2O, N2, and O2; and 120% oh excess air. My balancing equation looks like this: $$ C_8H_{18} ...
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1answer
70 views

In case of solvation , Who converts gaseous ions to aqueous ? Why do we even have gaseous but not solid ions?

We take Nacl and dissolve it in water. There is formation of $Na^+$ and $Cl^-$ gaseous ions along with 2H+ and $Cl^{2-}$ aqueous ions. Then , Na+ is attracted towards $Cl^{2-}$ and 2H+ is attracted ...
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Difficulty in understanding polarization? Is it only applicable for H and an electronegative element like chlorine? [closed]

There are two examples I have taken in diagram. In the first one , we have a cation and anion. They form an ionic bond due to which the cation has no electrons and the anion has 2 electrons. There are ...
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1answer
48 views

Difficulty in understand the meaning of standard enthalpy of formation

Standard enthalpy of formation is when one mole of compound is formed from its constituent elements. Example : $H_2$(g) + $O_2$(g) —>$ H_2O$(L). But we don’t say the same for $CaO + CO_2$ —> $...
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1answer
21 views

Specific CO2-Emissions of Natural Gas & Hydrogen Mix [closed]

consider I have a mixture of Hydrogen and Natural Gas. The volumetric mixture is $\varphi_{H_2} = 70 \%$ and $\varphi_{NG} = 30 \%$. So the $H_2$ makes up a mass fraction of $$w_{H_2} = \frac{\rho_{...
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1answer
101 views

Is it possible to use direct air capture technology for CO2 on a non-commercial level?

CO2 is used as fertilizer in aquariums where it's brought into the water with diffusors from compressed form in cylinders. Direct Air Capture machines for CO2 have been presented for experimental geo-...
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1answer
33 views

Is molecular dynamics relevant for an undergraduate Mechanical Engineering degree? [closed]

I am completing my final year undergraduate study in Mechanical Engineering. I've had to have a scope change because my last project was not going to work with the pandemic. I've been given a project ...
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2answers
60 views

What is the field on engineering that combines chemistry and electronics together? [closed]

I am looking for a career advice as I am interested in chemistry and electronics at the same time but the universities somehow have the two as different major. Is there any branch of engineering that ...
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2answers
69 views

Can wet welding be done in mineral oil?

I'm interested in knowing whether or not submerged welding can be done in fluids other than water, specifically mineral oil in this case. The reason I want to know is that I'm looking into designing ...
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1answer
132 views

Help with Mass Flow Rate

I'm a beginner in chemical engineering so apologies in advance if this question is very basic! The Problem You are required to measure the mass and volumetric flow rate of a slurry stream. The slurry ...
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1answer
59 views

How to predict out wavelength emitted from gasses

I'm trying to figure out which gas emits a specific wavelength when excited. Say I want to develop an LED that emits a certain wavelength. How would I figure out which gas emits that specific ...
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26 views

Is it possible to do purification of Sodium Sulphate and which companies do this? [duplicate]

If Sinter filter generates lots of Sodium Sulphate and then is there a way to make purification of this and which companies are already do this process?
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1answer
58 views

Why do Blast Furnace flue dust generates high rates of Zn (Zinc)?

The Blast Furnace flue dust contains high rates of Zn (Zinc). I'd like to know the reason behind this. The chemical reaction of Zn inside blast furnace dust. Why it's rates becoming high?
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How do I charge titanium dioxide particles submurged in black-dyed water in home?

My first thought was to charge the titanium dioxide particles by first charging a balloon by rubbing it on my hair and then touching the balloon to the titanium dioxide powder, but that would be ...
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25 views

How would I go about charging titanium dioxide for e-paper technology project?

I'm experimenting with rubbing a balloon on a silk (to get the electrons) and then touching the balloon to two small aluminium foil balls to see if they'll repel but they don't (if I do it with ...
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1answer
47 views

Is there an industrial process that makes use of photosynthesis?

When I was in school, photosynthesis was taught as this amazing biological process that took light and water and turned carbon dioxide into oxygen and carbon. It was implied that this was limited to ...
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1answer
935 views

What chemical can be used to restore synthetic rubber?

When rubber (I don't know the specifics, but I assume it's butyl rubber) gets old, it turns into one of two states usually: It becomes sticky and gummy. It becomes hard and brittle. I'd like to know ...
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1answer
60 views

What is the mechanism of adsorption-desorption on biochar obtained from slow pyrolysis/ torrefaction?

Biochar is a major by-product from pyrolysis along with bio-oil and it is considered an important chemical feed-stock because of many light oxygenates. I have read some papers on using bio-char use ...
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1answer
41 views

What's a good way to equalize pressure between 2 spaces without allowing gas exchange under normal circumstances?

I have a reaction chamber where gasses are injected to maintain a certain mixture. The container is sort of like a bell, where the bottom is submerged in water to make a seal. The issue I have is ...
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0answers
29 views

What is the smoke made by the fogging machine? Is it harmful to humans?

What is the principle of a fogging machine ? on what process a fogging machine depends ? distillation or vapourization ? what is the harmful effect of fogging machine ?
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2answers
61 views

Why does aluminum clad steel wire have high corrosion resistance?

Why do aluminum clad steel wires have high corrosion resistance despite being two dissimilar metals? Does the aluminum act as a protective & sacrificial layer similar to zinc in galvanization or ...
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1answer
154 views

pH calculations for boiler water

For water steam cycle in a "combined cycle power plant" containing 3 boiler drums and dosing of 5% ammonia solution in the condenser. How can I calculate the pH of the boiler water in each of the ...
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1answer
51 views

Generic category of PBT thermoplastic

I'm an EE, but I'm working on a project at work where I need to venture into materials science & chemistry. My question is, does thermoplastic, Polybutylene terephthalate (PBT), fall into any of ...
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1answer
164 views

Calculate the specific surface area of a mesoporous sample

I'm a nanoengineering student who's been stuck on the following problem for a few days. I've gone back over my professors slides, watched podcasts from an old professor, etc. etc., but don't ...
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0answers
22 views

Referencing for Air Quality Monitoring

I asked the same question in electronics sub, but since it is more general I am asking it here again. I bought the Sharp dust sensor GP2Y1010AU0F. Below are the graph of readings indoor for ~5 minutes,...
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2answers
660 views

How can I vaporize metals?

What are some common ways that I can vaporize Metals into a vacuum chamber? How can I keep these Metals in a gaseous state?
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0answers
23 views

How to quantify adulteration of urea and hydrogen per oxide in cow milk? [closed]

I am very much new in this field and trying to get some information on adulteration of cow milk. I have searched and saw that mostly urea and hydrogen per oxide are mixed with cow milk. I found that ...
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0answers
20 views

Safely evaporate electrolyte from fragile porous substrate

We have porous ceramic platelets of ~50x5x1 mm³ thickness infiltrated with ammonium nitrate solution (NH4NO3). We want to decompose and evaporate it w/o damaging the fragile substrate (decomposition ...
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108 views

Eletrolysis of water

The electrolyser used in the process at 25°C and 10.0 bar exhibits a global yield of 82% with a potential of 1.481 V. Determine the electrical energy that can be electrolyzed by year in order to get ...
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1answer
34 views

What does it mean by "loops and troughs"? [closed]

Actually, I've asked this question in "English Language & Usage" but someone told me ask it here! What does it mean by "loops and troughs" in: "Source has acquired a pattern of loops and troughs."...
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1answer
890 views

Mass balance of a recycle stream

I'm a chemical engineer student and I have just started to learn about mass balance without reaction. This is my problem - I want to find Out the mass composition and mass flowrate of stream Y (...
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1answer
1k views

Calculate the radius of iridium atom, given that Ir has an FFC crystal structure, a density of 22.4 g/cm3 and atomic weight of 192.2g/mol [closed]

Calculate the radius of iridium atom, given that Ir has an FFC crystal structure, a density of $22.4\text{g/cm}^3$. and atomic weight of $192.2\text{g/mol}$. Everyone whom I asked this question ...
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2answers
71 views

Energy balance for a system

A hydropower plant uses a river to generate electrical energy. It has a drop of $107m$ and the flow rate of water is $275$ $m^3$/$s$. The flow rate of the water is the same in and out of the system. ...
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1answer
540 views

Are brass and copper utensils safe for humans to eat from? [closed]

In my research over the internet everyone is telling that brass is not safe but still there are solenoid valves, joints, and piping made of brass used in everything like coffee machines, water ...
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2answers
91 views

is it possible to achieve 1000C temperature in a cabin?

is it possible that if i have a cabin which is insulated from outside but is built with some sort of material like copper and there is a heating element of sort which is providing 100C constantly but ...
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2answers
128 views

Nylon brittleness as function of moisture content

Can someone explain the how/why Nylons brittleness is to some degree a function of it's moisture content. I don't understand HOW the water content changes the elongation at break of the material. ...
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2answers
228 views

Chemical engineering calculations - basis

You have a gas of the following compositions : 40% N2, 30% CO2, 30%,CH4 in a tank . What is the Average Molecular Weight of the gas if your compositions is based on molar ? I found that the AMR with ...
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0answers
49 views

Batteries for electric airplanes [closed]

I'm interested in the development of electric small airplanes with 4 or 6 seats, that could really happen in the following decades. One of the main problems related to this project would be the ...
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2answers
1k views

Epoxy curing, heat or no heat?

Most if not all of the off-the-shelf epoxies I've used have generated a fair amount of heat while they are hardening. This seems to indicate to me that these are exothermic reaction, i.e. they ...