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4 views

Can acetic or hydrochloric or nitric acid have any effect on Glycine in an aqueous solution?

If I saturate water with Glycine at 100C and add pure Acetic Acid (in quantities equal to 5% of the volume of the solution) and leave it under reflux for a night, will the glycine be affected in any ...
-2
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0answers
18 views

What results after pyrolysis for solid biomass?

If a solid biomass undergoes pyrolysis at 800 degrees Celsius for about 40 minutes, what would be the output of it? I was thinking of Solid: Coke, Liquid: Tar and Heavy Hydrocarbon (gases).
3
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0answers
10 views

Aluminium isopropoxide electronic structure

From Wikipedia: A tetrameric structure of the crystalline material was verified by NMR spectroscopy and X-ray crystallography. The species is described by the formula $\ce{Al[(μ-O-i-Pr)2Al(O-i-Pr)2]3}...
1
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0answers
10 views

How does an irreversible process maintain internal energy while dissipating excess heat?

From my understanding, if you were to look at a pressure-volume graph of a reversible, isothermal expansion, the area under it would represent reversible work. Similarly, if you were to graph an ...
0
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0answers
5 views

Precise estimation of air properties as a function of temperature at 1 atm

Are there any tables with empirical equations to calculate properties of air as a function of a temperature at 1 atm? For example, NIST provides such equations for a large number of gases, but I was ...
2
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1answer
37 views

How is the central carbon in 3‐bromopentane‐2,4‐diol chiral?

My teacher told us the middle carbon in 3‐bromopentane‐2,4‐diol is chiral: $$\ce{CH3-CH(OH)-\overset{\star}{C}H(Br)-CH(OH)-CH3}$$ Since there are two identical groups around it, I would guess it ...
-2
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0answers
9 views

What is my final concentration if I obtain 0.025lbs of liquid from a 10% retinol soln? [closed]

The 10% retinol soln is in soy oil. the aliquot is 0.025lbs(2.5%) of a 1 lb batch, going into a cream.
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0answers
10 views

Are all ions bases/acids or their conjugate forms?

If one has a cation, is that always a base or a conjugate base? If one has an anion, is that always an acid or conjugate acid? If not, can you mention any of these ions? Also, if not every ion needs ...
2
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0answers
15 views

catalysts in catalytic hydrogenation

I am studying the very BASIC introduction of catalysis in general chemistry and encountered an example of a heterogeneous catalyst, which is catalytic hydrogenation of alkene into alkane using Pt/C or ...
0
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0answers
9 views

What is the chemical composition of the liquor from egg-white?

I am following traditional techniques using egg white to make a glaise for gold leaf embossing on to leather. The glaise dries on to the leather, gold leaf is laid on it, a heated diestamp is applied ...
0
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0answers
19 views

Doubt in a nomenclature for equilibrium constant

Why is there $H,N$ and $CO$ attached to the suffix of equilibrium constants? Particularly how to use these as suffixes? Nothing can be extracted from the reaction. There are many $H,N$ and so on like $...
0
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2answers
32 views

Is 1% m/m the same as 1% w/w?

Hydrocortisone cream seems to be sold as 1% w/w, but my cream is 1% m/m, which is confusing. Are they the same units or the same concentrations?
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15 views

Potential energy expectation value and virial theorem

I have been trying to solve this problem Part a) can be proved using the formula . For part b), the expectation value of the potential energy can be calculated from the integral , where Therefore, ...
0
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0answers
11 views

Salting out worsens extraction efficiency

I'm currently writing a thesis about using dispersive liquid-liquid microextraction DLLME for extracting nitramines from aqueous solutions. We've been using octan-1-ol as the extractant and HPLC for ...
-2
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0answers
10 views

Protein-Protein binding affinity

I am a complete novice at Protein-Protein interactions but needed a bit of clarity. I have a model that produces binding affinity between a drug and a viral target in terms of Kd values. I want to ...
-2
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0answers
20 views

Why is platinum used at room during prepation of alkanes from alkenes [closed]

During prepation of alkanes From alkanes,alkenes are hydrogenated using catalyst platinum at room temperature.
0
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1answer
16 views

Finding Gibbs energy at different temperatures just given Gibbs energy at one temperature

How would it be found the Gibbs energy at a certain temperature, if they just give you another Gibbs energy at a temperature? For example: Given $\Delta G = -230 Kcal/mol$ at $773K$ for the reaction $...
0
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2answers
23 views

How do oxide formations affect voltaic cells?

I asked a question previously on here but still have some confusion. To briefly summarize, I made a voltaic cell for a school project with 0.1 M copper nitrate and varying concentrations of aluminum, ...
-1
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0answers
9 views

How to determine if a species has a coordinate bond quickly?

is there a trick to determine if a species has a coordinate(dative covalent bond)? I looked at this answer:Identifying coordinate bonds, he gave an example of SO3, where he calculated the formal ...
0
votes
1answer
27 views

Why does Delta H change when the coefficients change in a reaction?

So I understand that if twice as much of the reactants are present, then twice as much energy is released. But isn’t the energy released per mole of reactant still the same? You are just scaling up ...
0
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0answers
17 views

Why is T-shaped geometry preferred to trigonal planar geometry for the bonds around atoms with 3 bonds and 2 lone pairs?

This is regarding a situation where an atom has five electron domains; two domains are lone pairs, and three are bonds to other atoms. The course materials I am using (focusing on VSEPR theory) ...
4
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0answers
17 views

Does the mechanism of AChE inhibition by Isoparathion depend on chirality?

It is known that the inhibition of acetylcholinesterase by isomalathion can proceed either with diethyl succinate as the leaving group or thiomethyl, depending on the specific stereoisomer of ...
-4
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0answers
17 views

BACK TITRATION MOLES QUESTION

The question is: 1dm3 of 1M NaOH was warmed with 30.0g of impure (NH4)2SO4 fertilizer. After all the NH3 was driven off 25.0cm3 of solution required 30.2cm3 of 0.1M HCl to neutralize the unreacted ...
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0answers
9 views

What is the lewis dot structure for As2Cl2 [closed]

What is the Lewis Dot structure for As2Cl2. When I try drawing it I am left with an unfilled octet with only 7 electrons.
2
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0answers
15 views

Describe the formation of the [PbCl4]2- complex ion

The $\ce{[PbCl4]^{2-}}$ complex ion is formed when $\ce{PbCl2}$ is exposed to excess $Cl^-$ ions in solution as explained here and here through the following reversible reaction: $$\ce{PbCl2(s) + 2Cl^-...
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0answers
14 views

Boiling points of TiCl4 and TiCl2

Why is the boiling point of TiCl2 (1500°C) so much higher than the boiling point of TiCl4(136°C)? Thank you in advance
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0answers
12 views

Find the initial pressure of a chemical equilibrium

Ethylene gas, $\ce{C2H4}$, reacts with hydrogen in the presence of a platinum catalyst to form ethane according to the equation: $$\ce{C2H4 (g) + H2 (g)-> C2H6}$$ 0.035 mol of a initial mixture of ...
1
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0answers
20 views

Can you get potassium by reducing KCl with lithium?

I would have said that the answer was no, because lithium is less reactive than potassium is, so you would expect the reaction to go the other way: with potassium and lithium chloride reacting to ...
0
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0answers
18 views

How to write The IUPAC name of the complex [Pt(NH3)2Cl(NH2CH3)]Cl

In my book, the IUPAC name of the compound [Pt(NH3)2Cl(NH2-CH3)]Cl is given as Diamminechlorido(methanamine)platinum(II) chloride. I have a doubt that why we are naming 'methanamine' in parenthesis? ...
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0answers
19 views

Calculate the pressure exerted by 0.0153 moles of CO2 gas in a container of 1.467 L at 20.0C [closed]

a) Calculate the pressure exerted by 0.0153 moles of CO2 gas in a container of 1.467 L at 20.0 °C. b) What is the volume of a 15.0 g sample of propane (C3H8) gas at Standard Temperature Pressure? ...
2
votes
1answer
31 views

Frequency Factor of the Arrhenius Equation

The question came to my mind as to whether the effect of a catalyst on a reaction included the modification of the frequency factor (or pre-exponential factor) of a reaction, shown in Arrhenius' ...
-1
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0answers
40 views

Reaction of Al3+ with ammonia

Why doesn't $\ce{Al^{3+}}$ form a coordination compound with ammonia? $\ce{Al^{3+}}$ forms $\ce{[Al(H2O)6]^{3+}}$ in water, so why can't it form a similar compound with NH3?
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0answers
38 views

percent Abundance [closed]

On a planet Q, there is a metal Y with an atomic number of 48. Y has three isotopes Y-124, Y-128 and Y-138. From analysis, it is known that the abundance of Y-138 is 4 times more than Y-124. The ...
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0answers
19 views

Chemical equilibrium - Direction of reaction [closed]

The reaction which proceeds in forward direction is: a) $\ce{SnCl4 + Hg2Cl2 -> 2HgCl2 + SnCl2}$ b) $\ce{2 CuI + I2 + 4K+ -> 2Cu^{2+} + 4KI}$ c) $\ce{NH3 + H2O + NaCl -> NH4Cl + NaOH}$ d) $\ce{...
-2
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0answers
19 views

Write the structure of the major organic product of the reaction of 1-bromo-2-methylpropane with NaOCH2CH3 in CH3CH2OH

The solution to this question was an E2 product. However I assumed the reaction would be SN2 since 1-bromo-2-methylpropane had a primary substrate. Why is the product E2? Process of thinking: (OF why ...
-4
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0answers
24 views

I have a homework doubt related to chemical equilibrium [closed]

One mole of N2O (g) at 300K is kept in a closed container at 1 atm. It is heated to 600K when 20% by mass of N2O4 is decomposed to NO2(g). What is the resultant pressure. A) 1.2 atm B) 2 atm c) 2.4 ...
-1
votes
1answer
15 views

Could shear force from blending denature alpha amylase / glucoamylase enzymes?

I am trying to break down the starches in a certain variety of oats in the most efficient way possible. I have to break the whole oats down after cooking, so they are finer particles for the amylases ...
0
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0answers
24 views

How are natural orbitals derived from the electron density matrix?

I have a $4\times4$ electron density matrix in 6-31G for $\ce{H2}$ using psi4 and I am wondering how to get the natural orbitals of the system. I have diagonalised the density matrix $\mathbf{M}$ into ...
4
votes
1answer
45 views

Physical significance of Chemical potential and Fugacity

I'm studying equilibria and thermodynamics and came across these two terms. My problem is, unlike other thermodynamic properties that I can understand physically like Volume, Pressure, Enthalpy etc. ...
-2
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0answers
25 views

Why is the structure of atrazine so small compared to it's chemical formula? [closed]

The chemical formula of Atrazine is C8H14ClN5, however, I can't seem to find a structure for it that has the right amount of each element. Most structures look like this
-4
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0answers
21 views

What is the oxidation state of Ru in H2Ru6(CO)18? [closed]

(asked in Indian civil services chemistry optional exam, 2009) I want to ascertain whether oxidation state of Ru is positive(H present as hydride ligand) or negative(H present as positive counter ion)....
4
votes
1answer
52 views

How are the toxic components in a mixture identified?

I was doing research on buckwheat sprouts (as to whether I should include them in my diet) and I came across a website that said eating too much can cause fagopyrism, which is caused by compounds ...
-1
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1answer
27 views

Is incineration of a solid fuel complete or incomplete?

If I have some solid material like biomass and incinerate it at 1000 Celsius degrees for 15 minutes in an oxidized atmosphere within an incineration oven. As an output it gives me ash. Is the ...
-1
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0answers
18 views

What is d-orbital contraction?

I know that this is a very common question but it's important to address because I thought d orbital contraction only had an effect on the effective nuclear charge ($Z_{eff}$) but recently I came to ...
-1
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0answers
26 views

Observed and experimentally calculated standard electrode potential of Cobalt and Manganese

In my book (NCERT India) the below diagram and a corresponding explanation is given. The line tells that the observed standard electrode potential of manganese is more negative than the calculated one ...
-1
votes
2answers
29 views

What start the reaction in a voltaic cell?

In a zinc-copper voltaic cell, What causes the initial electron movement from the zinc to the copper? I understand that copper would pull the electrons more strongly than zinc, but only if it is ...
-3
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0answers
22 views

What is the temperature of air achieved with natural gas heaters? [closed]

I am designing a conveyor oven. Aluminum molds are being heated with gas heaters. I want to know what will be air temperature?
-1
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0answers
25 views

Which is correct for a gas? [closed]

Which is correct for a gas ? a) mean free path is less than collision diameter b) mean free path is greater than collision diameter c) mean free path is equal to collision diameter
0
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2answers
48 views

Why is H2O a weaker acid than acetylacetone? Shouldn't a hydrogen connected to an oxygen be more acidic than a hydrogen connected to a carbon atom? [closed]

I recently started studying chemistry after a long pause in my education so pardon me if it is a simple question. In the organic chemistry course I am taking, the professor told us that the first ...
8
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1answer
395 views

Photochemical reduction of benzophenone: why inverted flask?

I've come across an interesting protocol for photochemical reduction of benzophenone to benzhydrol (diphenyl methanol) with sodium alcoholate in alcohol, the 2nd protocol in https://prepchem.com/...

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