Unanswered Questions
712 questions with no upvoted or accepted answers
4
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Ratio of MbO2/Mb in a satured solution of dissolved oxygen from dry air
What is the ratio of $\ce{MbO2/Mb}$ if the solution is saturated with air?
Details of the question:
$$
\begin{align}
\ce{Mb + O2 (aq) &-> MbO2}\\
\Delta G' &= -30.3~\mathrm{kJ/mol}\...
- 9,881
4
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115
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Synthesizing monodisperse PbS quantum dots
For a research project, I am trying to synthesize lead (II) sulfide quantum dots using the method of Li et al.. I am injecting sulfur dissolved in 1-octadecene into a mixture of $\ce{PbO}$, oleic ...
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4
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169
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How do xanthan gum and other hydrocolloids work?
Does anyone know what causes things like xanthan gum to make water into a slimy substance on the molecular level?
- 10.7k
4
votes
1
answer
108
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In the nonideal solution, why can't one of the solute be positive deviation and the other be negative deviation?
In the nonideal solution, why can't one of the solute be positive deviation and the other be negative deviation?
Let's say A and B makes a nonideal solution.
The moleculat force between A and B means ...
CommunityBot
- 1
3
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0
answers
61
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Is double excitation of nitrogen possible, and would it be able to use it as a central atom in a coordination complex?
I’m 17 and in my 2nd year of high-school (we have it a tad different here in the Czech Republic) and am interested in theoretical chemistry so that’s the explanation of the nature of my question.
So, ...
- 38.4k
3
votes
0
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76
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Bancroft's point
In the last problem (Problem 10.43) within the problem section of Chapter 10 in "Introduction to Chemical Engineering Thermodynamics" (J.M. Smith, H.C. Van Ness, M.M. Abbott, McGraw-Hill, ...
- 3,669
3
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0
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115
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Isothermal expansion of an ideal gas calculated two ways
Consider the following problem:
$\pu{1.0 mol}$ of a monoatomic ideal gas is expanded from state 1 to state 2 as shown in the figure. The magnitude of the work done for the expansion of gas from state ...
- 57
3
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61
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Does real-world gas phase chemistry use "concentration reaction quotients" (K_c)?
As a theoretical chemist, my entire exposure to reaction quotients and equilibrium constants ($Q$ and $K$) is through thermodynamics ($\Delta G^\ominus = - RT \ln K_{eq}$ and so on).
So as I started ...
- 151
3
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0
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310
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Equilibrium constant of the formation of ferric thiocyanate
I was reading the paper Relaxation Kinetics of Ferric Thiocyanate (Goodall et. al, 1972) and I came across a passage which read
$\space$ Reaction (1) is the simplest representation of the equilibrium ...
- 173
3
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0
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309
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Derivation of the Van 't Hoff equation
I was reading the paper Relaxation Kinetics of Ferric Thiocyanate (Goodall et. al, 1972) and I came across the passage
Reaction (1) is the simplest representation of the equilibrium between ferric ...
- 44.3k
3
votes
0
answers
114
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Is the change ΔG for an ideal gas unknown?
When one is introduced to the first law of thermodynamics, one learns that enthalpy is only a function of temperature, and calculating its changes is straightforward
\begin{equation}
\Delta H^\pu{...
- 3,669
3
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0
answers
88
views
Is the activation energy for vaporization equal to the enthalpy of vaporization?
When ethanol, say, evaporates, the intermolecular forces between molecules need to be broken. As a vapour, there are no new forces being created, so it is a purely endothermic process, with no "...
- 249
3
votes
0
answers
45
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What is the goopy substance that forms before CaCO3 precipitates?
I do a lab where we mix a solution of sodium carbonate with a solution of calcium nitrate. As expected, calcium carbonate (white solid) precipitates out. However, if the concentration is high enough, ...
- 49
3
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124
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What is the number of Gaussian chains of network per unit volume of rubber?
In this chapter, page 70, I encountered the term `Gaussian chains of network'. In equation 3.34 (page 73) of this chapter, the phrase 'n is the number of moles of Gaussian chains' occurs in the ...
- 39
3
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52
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How to calculate composition of alcohol/water mixture to achieve given concentration of alcohol vapors in air for calibrating a DIY breathalyzer?
I made a breathalyzer using a MiCS-5524 gas sensor. I would like to calibrate it so it can be close to accurate. e2v technologies — MiCS Application Note 4, Using MiCS Sensors for Alcohol Detection (...
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