# All Questions

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### Does fluoroantimonic acid dissolve noble metals?

Hello,Does fluoroantimonic acid dissolve noble metals? Nernst equation suggests that platinum would require pH ≈ −20.1 to be dissolved, using Hammett acidity function as an extension of pH ...
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### Loss of entropy and solvation energy in proteins

I am reading a chapter on protein stability. One section outlines the role of salt bridges or ion pairs in the stability of a protein. The excerpt goes as follows (italization added for emphasis): ...
39 views

### difficulty of de-protonating a vinylic halide

I'm confused as to why the second elimination of a dihalide to form an alkyne is so much slower than the first. It seems like the H on one carbon an X on another carbon would still align their ...
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### How can one measure instantaneous ionisation ratio of a weak electrolyte?

Trying to get information about ionization ratio of weak electrolyte, led me to a few page with information about how to calculate it, but this will give me a static equilibrium answer. I'd like to ...
42 views

The name of biradical —CO—CH2–O—CH2–CO— is Oxybis (1-oxo-2,1-ethanediyl). Why is it wrong to write 1,2-ethanediyl instead of 2,1? Thanks in advance!
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### Why does nitric acid react with less reactive metals [duplicate]

So we are studying the acid base chapter and I came across these reaction: $$\ce{3Ag + 4HNO3 -> 3AgNO3 + NO + 2H2O}$$ My question is, how can $\ce{Ag}$ react with $\ce{HNO3}$ as it is lower than ...
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### Chemical analysis of campholene nitrile

I have a problem. I am synthesizing an organic compound called campholene nitrile (2,2,3-trimethylcyclopent-3-en-1-ylacetonitrile). I need to analyze it. But there's a problem. I do not work for a ...
43 views

### Why does Phenylalanine to Tyrosine release H2O?

So I was reviewing Tyrosine and Phenylalanine metabolism (according to this video) and maybe I'm missing something but in the first step, 1: Oxygen atom reacts with Phenylalanine to make up Tyrosine, ...
71 views

### Can molecules be pulled apart by magnetic fields?

If one were to have an molecule which two section, A and B, with section A being paramagnetic and B diamagnetic , and a magnetic field were to apply a force to the system, would there be a point if ...
22 views

### Substitution of dihalo alkanes

Can I substitute 1,1-dichloropropane to get propane-1,1-diol? I'm just not sure if such a reaction would be correct.
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### Will concentration of sodium hydroxide affect the result of chicken feather hydrolyzate if i don't standardized it?

The title of the paper: Isolation and characterization of keratin from chicken feathers https://doi.org/10.1063/5.0002792 Here is the method: Keratin was isolated by dissolving 5g of chicken feather ...
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### Why do we assume that the successive deprotonation of a polyprotic acid happens when only the previous deprotonation has reached equilibrium?

The steps for finding the concentration of the species at the equilibrium of polyprotic acid are as given in this book in section $10.16$ and illustrated on the next page. I have three questions, but ...
42 views

### Why does $\mathrm{NO_3}$ have charge $1-$? [closed]

I'm given the following problem: Write the molecular equation for the reaction $\mathrm{Iron\;(III)\; Nitrate\; and\; Sodium \;Phosphate}$ I begin by attempting to determine the empirical formula of ...
33 views

### Hydrochloric acid from diaphragm electrolysis

I have a diaphragm electrolysis cell, which is made up of an outer container containing the cathode and a small terra cotta pot containing the anode. If sodium chloride solution is placed in the outer ...
38 views

### Gases in the air [closed]

I was working on a question but I am unsure if I understood it properly. Maybe you can help me. In one experiment, Nitrogen was won during chemical reactions and filled into a baloon, and it weighs 2....
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### Will a liquid-liquid emulsion and the separated emulsion have same volume?

Let's assume that there is no dispersed gas (bubbles). Not sure about dissolved gas; maybe you can tell me if that matters. Ordinary liquids (aqueous solution and biological oil). Surfactants are ...
22 views

### Help drying polyurethane sealent top coat

I've used a polyurethane water sealant coating for concrete that is called (vulkem 951 part A ) and it was supposed to mixed with part b the catalyst that starts the drying process but do to a ...
20 views

### What quantity is one mole in the reaction in enthalpy change? [duplicate]

For example, I have a reaction: $H_2(g)+\frac{1}{2}O_2(g)→H_2O(l),𝛥H=-285.8 kJ mol^{-1}$ What does this "per mole" in the unit represent? What quantity is one mole?
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### What is the effect of temperature on the enthalpy of reaction?

In the study of reaction mechanisms, enthalpy of formation for intermediate compounds at various temperatures is studied. I understand the reason to do that. How much (and what) effect can temperature ...
121 views

### Justification for using valence bond theory and molecular orbital theory together?

Elementary gen chem books will make the careful distinction between the two theories and then proceed to claim that chemists can use both to complement each other to explain the behavior of certain ...