All Questions
Tagged with equilibrium physical-chemistry
58
questions with no upvoted or accepted answers
4
votes
0
answers
84
views
Regarding Ellingham diagrams
In my textbook, the following information is given about Ellingham diagram:
The interpretation of $\ce{\Delta_rG^\circ}$ is based on ${K}$ ($\ce{\Delta G^\circ = -RTlnK}$). Thus it is presumed that ...
- 549
3
votes
1
answer
65
views
How can a Michaelis–Menten formalism be used when enzyme concentration isn't constant?
I understand that $V_\mathrm{max} = k_3[\ce{E}]_0$ in ordinary Michaelis–Menten (MM) kinetics. According to the lecture notes provided by my university (I don't believe they are available online), ...
- 31
3
votes
0
answers
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, ...
- 3,684
3
votes
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answers
270
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Is dehydration of cobalt(II) chloride hexahydrate dynamic equilibrium?
I know that the dehydration of cobalt(II) chloride hexahydrate is a reversible reaction, is it a dynamic equilibrium?
$$
\begin{align}
\ce{CoCl2·6H2O &<=> CoCl2·2H2O + 4 H2O}\tag{R1}\\
\ce{...
- 31
3
votes
0
answers
174
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Why aren't electrons included in the equilibrium constant expression?
This might be elementary, but why aren't electrons included in the equilibrium constant for a half-reaction?
For example, for
$$\ce{O2 (g) + 4H+ (aq) + 4e- -> 2H2O(l)}$$
we have
$$Q = \frac{(a_\ce{...
- 1,241
3
votes
0
answers
125
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Why does high blood gas partition coefficient of a inhalational anaesthetic drug mean slower induction of anesthesia?
High blood gas partition coefficient of a drug corresponds to higher solubility of the drug in blood leading to high concentration of the drug in blood with respect to gas (air in alveoli). If the ...
3
votes
0
answers
319
views
Is the active mass of every solid and liquid taken to be unity?
I learnt from my textbook and the question/answer - Why is active mass of a pure solid or liquid always taken as unity? that active mass of a solid or liquid is taken to be unity as:
$$[A]=\frac n V=\...
- 2,090
3
votes
0
answers
82
views
Reverse rate coefficient for thermolecular and thermal dissociation reactions
I am an astrophysicist working in exoplanetary atmosphere chemistry right now, in particular modelling the chemical kinetics taking place within the atmosphere. Based on this IOP article, we have that ...
3
votes
0
answers
546
views
Enthalpy change of chromate-dichromate reaction
I am a uni study doing chemistry. I have taken a little bit in highschool before, but not in a while.
In a (nonassessed) practical, we have to predict how heating a chromate/dichromate solution:
$$\...
- 445
3
votes
0
answers
820
views
Dissociation percentages of N2O4 at different pressures using Gibbs' free energy
\begin{align}
\ce{N2O4(g)&<=>2NO2(g)} &
\Delta_\mathrm{r}G^\circ &= \pu{4.7 kJ mol^-1}
\end{align}
Knowing that the standard values for pressure and temperature are $\pu{1 bar}$...
- 587
3
votes
1
answer
166
views
Why does the equation for chemical potential apply to liquids and aqueous solutes?
The equation for chemical potential of a gas can be derived as such:
At constant temperature,
$$\mathrm dG = V\,\mathrm dP \label{eqn:1}\tag{1}$$
Substituting with the ideal gas law $PV = nRT$,
$$\...
- 360
2
votes
0
answers
78
views
Does copper(II) hydroxide dissolve in ammonia solution?
According to University of Oregon — Chemistry Interactive Demonstrations and Educational Resources — Copper-Ammonia Complex, the equilibrium constant for the formation of copper(II) hydroxide is ...
- 620
2
votes
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answers
41
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Do decomposition potentials change during electrolysis?
I was just wondering if decomposition potentials actually change during electrolysis. For example, if we reversed the Daniell cell reaction so that copper is oxidized, the half cell reactions would be:...
user115162
2
votes
0
answers
56
views
Calculating the solubility for chromium(III) hydroxide using the complex ion constant
Problem
$$
\begin{align}
\ce{Cr(OH)3(s) &<=> Cr^3+(aq) + 3 OH-(aq)} &\quad K_\mathrm{sp} &= \pu{6.7E-31} \\
\ce{Cr^3+(aq) + 4 OH-(aq) &<=> Cr(OH)4-(aq)} &\quad K_\...
- 31
2
votes
0
answers
36
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Why isn't the chemistry of a zinc-air battery (meaningfully) hindered by an activation energy barrier?
Virtually every source I've read pertaining to zinc-air batteries explain the chemistry of it either using these formulae or a simplified version of them:
$$
\begin{align}
&\text{Anode:} &\...
- 139