# All Questions

28,634 questions
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### Intuition for why catalyst affects both forward and reverse reactions equally?

I have looked for quite a long time on the site however all the answers involve mathematical explanations involving Arrhenius's equation. I would really like an intuitive reason (or one using ...
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### What chemical regularly transported by road in the UK would cause serious injury/loss of life if it escaped in a road accident?

I'm writing a story where a serious multi-vehicle pileup happens in the winter during foggy weather. I need the fallout from this to include the escape of a substance that will cause significant ...
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### Can any body Suggest me a set up that I can build it up to study the surface roughness of transparent polymeric fibres?

I need to study the surface of nylon-6 blank fibres with a thickness of nearly 40 micrometre, I work in optics lab with many optical components such as beam splitters, lenses, mirrors ... etc, can I ...
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### Gaussian syntax error on the input line

I ran a Gold complex in Gaussian 09 with the following exact Route Section PBE0/LANL2DZ Opt Freq NoSymm and it gave me this error message: ...
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### Optimized General Contractions using the EMSL Basis Set Exchange

When using the EMSL BSE Database and selecting a basis set, one can choose the "Optimized General Contractions" or not. When doing so for, e.g., Nitrogen and the cc-pVDZ some basis functions are not ...
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### Formaldehydes fehlings test

I have read answer to the question, why benzaldehyde and pivalaldehydes do not give fehlings test. But based on those similar lines here in HCHO also we don't have alpha hydrogens,then how will that ...
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### Please tell how to find the final volume with composition [on hold]

Please tell be how to solve the problem because I am unable to find the final volume
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### Which of these species can act as a Lewis acid? [on hold]

$\ce{Fe^{3+}}$ $\ce{CN-}$ $\ce{CH3COOH}$ Would it just be three since it is able to donate hydrogen?
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### Predicting the products obtained after addition of bromine and then elimination using alcoholic KOH

If we have an alkene reacting with bromine, then I know that the the reaction happens by a cyclic intermediate. But if we add alcoholic KOH to the products formed, then what will be the major products ...
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### Sulphur monochloride and selenium

Wondering if adding Selenium powder to Sulphur Monochloride results in Selenium monochloride. Anyone?
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### Method to determine the maximum coordination number that can be exhibited by any element

I have read that coordination number depends on size,charge ,and electronic configuration . could anyone explain giving a example how to determine the maximum coordination of any element
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### Is there any book or text where ionic radius of elements are given?

So my research has me looking for ionic radius characterization. If anyone could post any link or give the name of any book where ionic radius of all elements are given that would be really great?
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### Which molecule is the most acidic? [on hold]

Wouldn't the most acidic be the H connected to F? However, my professor says it is answer A, the alpha Hydrogen in carboxylic acid. Edit: Sorry, I did not phrase my question right. What I meant to ...
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### Saponification side reactions

When soap is made from triglycerides and NaOH reacting, is saponification the only reaction that occurs or are there other side reactions. Information concerning this issue seems slim online
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### Affect of pH on temperature [on hold]

It’s common knowledge that temperature has an affect on ph. can ph changes affect temperature? Looking at the human body and the relationship of temperature and ph, it seems like temp. is the ...
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### If that amount, from problem 7, fills a room 500,000 L, then how many parts per million carbon dioxide are in the room? 1 mol of gas occupies 22.4L​ [on hold]

If that amount, from problem 7 (the amount is the propane balanced equation: C3H8 + 5O2 = 3CO2 + 4H2O), fills a room 500,000 L, then how many parts per million carbon dioxide are in the room? 1 mol of ...
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### Is 99% Isopropyl Alcohol sold in stores really 99%?

My understanding is that an azeotropic mixture of isopropanol and water is 91%. This makes sense as to why there are so many brands of rubbing alcohol sold at 91%. There are also some sold as 99%, ...
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### The radial part of the wavefunction squared gives the probability of finding the electron at radius r from the nuclear centre per unit volume [on hold]

'Ψ(r)2' gives the probability of finding the electron at radius r from the nuclear centre per unit volume.' The 'per unit volume' part of the definition is confusing as the definition says 'at radius ...
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The above picture was shown in a presentation by my prof in inorganic chem as we were discussing ionic radii more in depth (all in pm). These are all isoelectronic radii. Notice the sudden leap in ...
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### The acid HA is 4.1 % hydrolyzed in solution. If the concentration of HA in solution is 2.0 M, what is the pH? [on hold]

The acid HA is 4.1 hydrolyzed in solution. If the concentration of HA in solution is 2.0 M, what is the pH? a. -.91 b. -.30 c. .30 d. .91 g. 2.77 For this problem i have no idea where to go.. ...
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### Butadiene for yoga mats [on hold]

I am researching new ways to make a better yoga mat.Can Butadiene be used in production of Yoga mat? Can Butadiene be infused with essential oils? Thank you
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### Help with missing output from cubegen utility after density calculation in Gaussian16

I am busy trying to do density calculations in Gaussian16 as I need the .cube output for input to the PIXEL software. But my Gaussian output seems to be missing an entire chunk of data and I don't ...
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### Why does monoammonium phosphate (MAP) have 52% of phosphorus (P₂O₅)?

The formula of monoammonium phosphate (MAP) is $\ce{NH4H2PO4}$. Manufacturers say that MAP has 10% of nitrogen (N) and 52% of phosphorus (P). However, its molecular mass is 115 u and the atomic mass ...
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### Where can I look for a short chain photopolymer?

I am by no means an expert in this field, so please be patient with my explanation. I am looking for a photopolymer with very specific properties. I am not sure how realistic it is to find such a ...
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### What is the platinum doing in a Zippo hand warmer?

My Zippo hand warmer requires lighter fluid, platinum catalytic burner, and a heat source to start the flameless catalytic process. What is the platinum doing in this reaction?
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### MacGyvering medieval poison [on hold]

Anyone know of any compound/substance one could have access to in a stone prison cell (From food? The rocks? The metal bars?) that could be processed through rudimentary means into a quick acting ...
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### Buffer Systems, K(NH2)2 and HCL [on hold]

25 .00ml of 0.100M R(NH2)2 with $Kb1=1*10^{-4}; Kb2 = 1*10^{-7}$ is mixed with amounts of .100M HCL a.) 0 ml b.) 5ml c.)10ml d.)12.5ml e.)25.00ml f.)37.50ml g.)50.00ml h.)60.00ml What is ...
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### How does chelation control result in rate acceleration?

In the chapter on diastereoselectivity in Clayden, Warren & Greeves (2012), the Cram-Chelate model is discussed. Most significantly, under chelation control, the diastereoselectivity of the ...
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### Why aren't all bond lengths equal in cyclobutadiene? [on hold]

even when there is a possibility of conjugation why aren't bond lengths equal?
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### Conflicting info on TRIS buffer - pH6.8 [on hold]

I was about to prepare buffer for milk enzyme and to follow prep method described on bio-rad. But then I became suspicious and came across tons of information that pH6.8 is not in effective pH range ...
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### How to take a sample of a hot salt solution without it precipitating in the cooler glassware due to the difference in solubilities at different temps?

I'm doing an investigation to see the effect of temperature on the solubility product of strontium hydroxide. I made a supersaturated solution left in the oven overnight at 85°C for equilibrium to be ...
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### Parent and molecular geometry [on hold]

is the molecular geometry for carbon in formic acid trigonal planar. Also is the parent geometry for carbon in formic acid trigonal planar as well. Whilst the molecular geometry for hydroxyl oxygen in ...
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### What is the reason for more stable keto form to tautomerise to a less stable enol form?

In the mechanism of SeO2 I have seen that a more stable keto form first converts to a less stable enol form and then yields a diketone. I have seen many other reaction where the reactant converts to ...
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### How do amphoteric compounds act as acids? [on hold]

According to my chemistry textbook, an acid is a compound that gives hydronium ion on dissolving in water but amphoteric compounds like ZnO do not yeild hydronium ion on dissolving in water . I ...
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### How to determine the number of water ligands attached to Pd in palladium chloride aquacomplex PdClₓ · yH₂O?

Normally this can be achieved using UV-vis: there is a strong absorbance around wavelength 220 nm which varies based on the number of ligands. If the palladium concentration is too high, the solution ...
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### Effect of solid in equilibrium

CaCO3 (s) = CaO (s) + CO2 (g) We know that pure solids quantity doesn't affect the position of equilibrium. But the application of pressure in gas does. If we add CaCO3 in the closed system, the ...
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### The pH scale/calculating pH level [on hold]

How much water do you need to add to 10 mL of a solution of HCl with a pH of 4 to change the pH to 5?
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### Oxirane and ring opening

I have a problem given as :- I thought of a sn1 type mechanism in acidic medium and a sn2 pathway in basic medium . Am I correct or not . Please also check the mechanism according to which I formed ...