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8 views

Show that the following processes are irreversible [on hold]

Show that the following processes are irreversible. (a) Gas freely expands from V to V+dV (dV>0) adiabatically, and (b) Gas expands adiabatically from p to p+dp (dp<0) via the Joule-Thompson ...
1
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0answers
13 views

How to dissolve PLA/PCL/PMMA?

I have a research about electrospun membrane synthesis where I dissolve PLA pellets in chloroform:methanol (3:1) for 3 hours and also PCL pellets in chloroform:methanol (3:1) for 3 hours too. Another ...
0
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0answers
9 views

Which reaction occurs first when 5-hexen-1-ol reacts with sulfuric acid?

I am trying to solve this question: Find the major product of the following reaction: Now we could either do electrophilic addition on the alkene or do dehydration of alcohol. These two ...
-1
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0answers
21 views

the differences between glycerol and its commercial version glycerin [on hold]

Does glycerin still have the same magnetic properties as glycerol can someone please tell me it is for a science project that i need to explain just so i can make a visual representation of how it ...
0
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0answers
17 views

The most acidic hydrogen of 4‐hydroxybutanenitrile

Identify the most acidic hydrogen atom in the compound below: $$\ce{NC-CH2-CH2-CH2-OH}$$ My teacher said that the $\ce{H}$ connected to $\ce{O}$ is the most acidic since $\ce{O}$ is more ...
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0answers
11 views

combustion analysis [on hold]

2.4g of a compound of H,C,O gave on combustion 3.52g of carbon dioxide and 1.44g of water. the RMM of the compound was found to be 60 what is the masses of C,H,O what is the empirical formula of the ...
1
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0answers
34 views

Molecular orbital energies prediction with ML algorithms

In the recent years, computational chemistry community has focused on Machine Learning algorithms to predict molecular properties. Unfortunately, many of the authors of such papers are not chemists, ...
-1
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0answers
20 views

How can carbon black be pellet?

I want to make the carbon black paste and pelleterized it. What solvent can be used to heat up after carbon is formed?
-3
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0answers
14 views

The rate of diffusion of two gases A and B are in the ratio 16 is to 3 if the ratio of their masses present in the mixture is 2 is to 3 then [on hold]

The rate of diffusion of two gases A and B are in the ratio 16623 is the ratio of their masses present in the mixture is 2 is to 3 then
1
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0answers
26 views

Propylene Glycol to clean vinyl records

I clean vinyl records with an ultrasonic record cleaning machine. Would propylene glycol be good to use as a surfactant in a 1 - 2 % concentration with distilled water? Would it harm the vinyl record?...
-2
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0answers
14 views

Solutions and Dilutions [on hold]

I have a 1g per 80ml stock solution.I would like to create a 0.001g per Liter solution what volume of the stock solution should I add to make up a 1L solution?
-1
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0answers
12 views

Energy Conversion in a Activated Complex

My book states that transition state has highest energy out of Reactants and Products . My question is why ? If we follow law of conservation of energy shouldn't the extra energy given + existing ...
0
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0answers
17 views

Chemical reaction balance - High pH carbonic acid and calcium iodide solution

Is it possible to write the following chemical reaction in one compact balanced form instead of being two separate sections at the right hand side? $\ce{CaI2(aq)}$ + $\ce{2NaOH(aq)}$ + ($\ce{2H+}$ + $...
-1
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0answers
35 views

Equivalent weight of salts [on hold]

I was solving, my homework question, using chemical equivalence, question was this $448\ \mathrm{ml}$ of $\ce{SO2}$ at ntp are passed through $100\ \mathrm{ml}$ of a $0.2\ \mathrm N$ solution of $\...
1
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0answers
17 views

Sources for files for testing a thermal ellipsoid (ORTEP) program

I am trying to reimplement the functionality of the classical program ORTEP for producing thermal ellipsoid plots of a crystal/molecule in a modern computer language. Unfortunately, I am having ...
2
votes
1answer
440 views

Reaction of aqueous sodium carbonate with aluminum foil

Aqueous sodium hydroxide is known to react with aluminum foil in an exothermic, hydrogen-gas releasing reaction like $$\ce{2NaOH(aq) + 2Al(s) + 2H2O(\ell) → 2NaAlO2(aq) + 3H2(g)}$$ However, on ...
0
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0answers
26 views

How to name specific compounds? [on hold]

There's something about Chemistry that I need to clear up. Naming compounds. So I heard that there are different ways to name a compound depending on what it is. But I can't keep track of it all! ...
0
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0answers
36 views

Differential rate laws

Consider the following consecutive second-order irreversible reactions carried out in a batch reactor: $$ \begin{align} \ce{A + S &->[$k_1$] X}\\ \ce{X + S &->[$k_2$] Y} \end{align} ...
2
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0answers
19 views

eV and redox potential

I am trying to estimate the redox potential of an excited state as described in this reference. The paper says: The reduction potentials associated with the excited states cannot be directly ...
-3
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0answers
22 views

How do chemical signals store information? [on hold]

How exactly do chemical signals store & transmit information , eg. How do the chemical reactions in the eye paint a picture ? There must be information stored in the signals that tell the brain ...
-1
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0answers
30 views

Can I reverse an iron redox reaction with potassium hydroxide and electricity?

For a school project, about clean energy, me and my team are trying to build an iron battery. We are using a piece of iron (anode), potassium hydroxide (electrolyte), carbon electrode (cathode) ...
-1
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0answers
31 views

What is the ΔG* value for nucleation? [on hold]

To be honest, I would like to know how $\Delta G^*$ is different from $\Delta G$ in general and whether the star has any other significance. Now, moving to the second question. I was asked to find $\...
-1
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0answers
17 views

How can I better wash off soap with soft water? [on hold]

When using distilled water to wash off real soap, my hands still feel slippery. After doing some research it seems that the reason for this is due to the fact that soft or distilled water is incapable ...
1
vote
1answer
36 views

Why is the 2nd ionization energy of chloride similar to that of sulfur?

The first ionization energy of chloride is significantly greater than that of sulfur. I suggest that this is very expected as the effective nuclear charge of chloride is higher and additionally, ...
0
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0answers
24 views

Software to predict equilibrium products in the ideal gas phase

I'm interested in software packages that can answer the following kind of question: If I mix 30mol% $N_2$ and 70mol% $H_2$ together at 2 bar and 2000C, what is the equilibrium composition after all ...
-1
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0answers
22 views

Why is [Fe(CN)6]3- more stable then [Fe(ox)3]3- despite being a non-chelate?

I was reading up on how chelation leads to more stability of a complex, and then I came across this weird trend given by my professor in class as a contradiction, with no explanation. I'm curious what ...
-1
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0answers
39 views

Why was 6M HCl and 5M NaOH added the the procedure below? [on hold]

I am currently analysing a chemistry experiment which has been conducted and there are some steps which I cannot understand about the procedure and methodology which the scientists have used. Being a ...
-1
votes
1answer
45 views

Does bicarbonation require water?

In an aqueous solution of $\ce{NaOH}$ exposed to the atmosphere one can probably expect some degree of $$\ce{NaOH(aq) + CO2(g) -> NaHCO3 (aq)}$$ But, what would happen if just a solid block of $\...
1
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0answers
31 views

Diastereoselectivity of the Pauson Khand Reaction

I hope someone may help me. I don‘t know how to determine the diastereoselectivity of the product of the Pauson Khand reaction in generally. In the following I’ve got 3 practice examples,however in ...
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0answers
29 views

I did destruction but failed [on hold]

I did destruction for my sample on my research, but the sample is dry, no water anymore. I used to do it like 55 ml to 20 ml, but it was dry. Any solution for this? Except do sampling again.
-1
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0answers
43 views

Chemical Equilibrium problem

I can't seem to get the answer that appears on the back of the book Here is what i did: a) $K_p=K_x p^{\Delta N}$; in this reaction $\Delta N =-1$, then $K_pp=K_x$ from $\Delta G=-RT\log K_p$ I ...
-1
votes
2answers
50 views

Why doesn't ethanol dissolve in sodium bicarbonate?

Today I experimented with different solvents and solutes and was a bit surprised by one result. When I added ethanol to dilute sodium bicarbonate and tapped the test tube against my palm to mix it, I ...
-3
votes
1answer
36 views

ACS rules for citing indirectly [on hold]

A paper I'm reading makes the claim that Assam Bora rice starch is not digested in the upper GIT and cites: "Ahmad MZ, Bhattacharya A. Isolation and physicochemical characterization of Assam Bora ...
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0answers
13 views

Need help calculating grams of a substance with only molecules and g/mol [on hold]

How many grams are in 8.200e22 molecules of N2I6 This is what I've done to date though I don't know if it's correct N2I6= 789.414 g/mol 8.200e22 / 6.022e23 = .136 mol 789.414 g/mol * .136mol= 107.36 ...
-3
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0answers
14 views

how much does it takes a particle with size of about 200 nm go through a dialysis? [on hold]

how much does it takes a particle with size of about 200nm go through a dialysis membrane with toff 12kDa.
-3
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0answers
16 views

Oxygen Extraction From Water ( Conversion ) How many Oxygen is produced from 1 liter of water? ( Liters of air ) [on hold]

How many Oxygen is produced from 1 liter of water? Answer is needed to be convert in ( Liters of air ) e.g Human consume 7 to 8 liter of air in one minute.
-1
votes
1answer
28 views

32 Degree Thermochomic dye [on hold]

I am doing a school project which involves color changing based off of temperature, and I need a thermochromic dye that changes color at 32 degrees Fahrenheit. Does anyone know where I could find some ...
2
votes
0answers
46 views

Name of “the” benzodiazepine

Wikipedia has a thorough article on the benzodiazepines. Of course, it is written primarly from the pharmacological point of view; but there is also the "Chemistry" section, which includes the IUPAC ...
-2
votes
1answer
36 views

Why does $\ce{NCl3}$ have $sp^3$ hybridization and not $sp^2$ because of back bonding? [on hold]

I was asked the the hybridization of Nitrogen Chloride, and my thought process was that it should be $sp^2$ because of back bonding. The lone pair on the Nitrogen will be donated to the vacant d ...
-3
votes
0answers
23 views

THOROUGHLY mixing compounds [on hold]

I am trying to figure out what tools and methods I need to create a thoroughly mixed solution of the following component compounds: + 20 milliliters of liquid sunflower lecithin (very sticky and ...
-2
votes
0answers
8 views

What is the total bond energy for esterification? [on hold]

Ethanoic acid + methanol ➡ methylethanoate +water
-3
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0answers
23 views

convert 1277 cm2 to m2 [on hold]

What’s the steps to complete this problem? I get confused when going from atoms to moles to grams. Would this type of question be like the same process for atoms to moles to grams?
-3
votes
0answers
25 views

Simple Q. : Determining alkali from Ideal Gas Law (metal + 2 HCL)

I can't understand how to answer one of my Pre-Lab questions, it's going to be something really obvious but I can't find the fix for my answer from the supporting material... (This isn't cheating on ...
-1
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0answers
64 views

Is there something wrong with my code? [on hold]

I was checking my RHF code and found a couple of bugs (which include getting incorrect eigenvalues and eigenvectors amongst other things). I suspect it's either an issue with my Hartree-Fock algorithm,...
0
votes
0answers
45 views

Is a maleimide reaction inhibited by ethylene glycol?

Due to a recent switch in systems, we have to add 45% ethylene glycol to a maleimide reaction with Sulfo-MBS (m-maleimidobenzoyl-N-hydroxysulfosuccinimide ester) and a reduced oligonucleotide ...
1
vote
0answers
69 views

Why my boiling pot turned black?

Recently I ran out of dish washing detergent, so I decided to pick up one of the recipes online, to make my own "ecological" dish washing detergent alternative. The recipe was: Mix ingredients: ...
-1
votes
0answers
25 views

Methyl Radical. Lewis Acid or Not?

Is methyl radical a lewis acid ? According to me it is a lewis acid as any species can be considered as a lewis acid if it can accept an electron in its LUMO.
-1
votes
1answer
16 views

Number of subshells of a particular shell of an atom [on hold]

I recently learned that the number of subshells of a particular shell depends on the Azimuthal quantum number(l), which can have values from 0 to (n-1), where 'n' is the Principle quantum number. In ...
-1
votes
1answer
39 views

Boiling point elevation does not depend on the solute?

I've recently carried out an experiment trying to measure the boiling point elevation of water after adding 5M of NaCl and KCl. Although for some reason, KCl solution started boiling around 90 degree ...

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