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Results tagged with physical-chemistry
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user 31775
The study of chemical systems using the laws and concepts of physics. This usually requires the techniques of thermodynamics, statistical mechanics and quantum mechanics.
0
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What is the definition of liquid phase?
Why is a supercritical fluid not a liquid? My book says that because in a container above the critical temperature and critical pressure, a fluid of density similar to liquid exists uniformly in the c …
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2
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549
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To what microscopic quantity does Gibbs energy correspond to?
Is the Gibbs energy of a system equal to the potential energy of a system? The answers to this and this questions seem contradictory. Also, this does not seem to tell that Gibbs energy is equal to the …
- 1,278
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2k
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Why is the rate of a reaction proportional to the concentrations of reactants raised to thei...
Consider a gaseous state elementary reaction $$\ce{aA(g) + bB(g)} \overset{k_\mathrm{f}}{\underset{k_{\mathrm{b}}}{\ce{<=>}}}\ce{ cC(g) + dD(g)}$$
I know that for this reaction, $$\Delta G = \Delta G …
- 1,278
2
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1
answer
621
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Regarding the infinitesimal form of the First Law of Thermodynamics
First Law of Thermodynamics is expressed as[1]
The internal energy of an isolated system is constant.
If $w$ denotes the work done on a system, $q$ for the energy transferred as heat to the syst …
- 1,278
9
votes
1
answer
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Why is $\Delta G = -T \Delta S_{\mathrm{total}}$ valid only at constant pressure?
According to my book(Elements of Physical Chemistry by Atkins and de Paula, 5th ed.), $\Delta G = - T \Delta S_{\mathrm{total}}$ is valid only for constant pressure and temperature.
Enthalpy is defi …
- 1,278
6
votes
Accepted
Calculating Compressibility factor from the Van der Waals' Gas equation
$$Z = \frac{V^{\mathrm{r}}_{\mathrm{m}}}{V^{\circ}_{\mathrm{m}}}\tag{1}\label{1}$$
$V^{\mathrm{r}}_{\mathrm{m}} = \text{Volume of 1 mol real gas.}$
$V^{\circ}_{\mathrm{m}} = \text{Volume of 1 mol pe …
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Why doesn't a temperature and pressure gradient exist in a container of real gas?
In the Kinetic theory of gases, it is assumed that there are no intermolecular forces between the atoms/molecules. But real gases, have intermolecular attractive and repulsive forces.
Suppose a conta …
- 1,278
1
vote
Accepted
Can the change in the entropy of the surroundings always be obtained by dividing heat transf...
The surroundings that are assumed in the question are not the same surroundings as in the image. The surroundings in the image are essentially at a constant temperature while it is assumed in the ques …
- 1,278
2
votes
1
answer
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Why is the hydrolysis of the conjugate base of a weak acid neglected in buffer solutions?
Consider a solution which contains a weak acid and the salt of its conjugate base with a strong base.
e.g. $$\ce{CH3COOH + H2O <=>[$K_\rm{a}$] CH3COO- + H3O+}\tag1$$
$$\ce{CH3COO- + H2O <=>[$K_\rm{h} …
- 1,278