All Questions
Tagged with inorganic-chemistry thermodynamics
107
questions
4
votes
0
answers
100
views
With two reagents common on Mars, fluorite and CO2, how would I produce carbon tetrafluoride?
The hypothetical terraforming of Mars would require the heating of the atmosphere. A commonly suggested method is the in-situ production of fluorocarbons, powerful greenhouse gases.
For example, ...
- 141
0
votes
2
answers
110
views
Why does Cs2SO4 have more lattice energy that Na2SO4?
My chemistry teacher told us that $\ce{NaF}$ has a higher lattice energy than $\ce{CsF}$. He explained it by telling lattice energy is inversely proportional to size of ions added. He then mentioned ...
- 1
1
vote
0
answers
31
views
Estimation methods for temperature evolution of a high $\Delta H_{mix}$ dilution ($\ce{KOH}$ in water)
Question up front: Can temperature evolution in solutions be short-hand-estimated by simple state based calculations - with reasonable expectations of precision? (+/- 10° C)
I am trying to calculate ...
- 2,805
-5
votes
1
answer
91
views
Is salt formation catabolic or anabolic? [closed]
In class we learned that catabolic reactions are exergonic. I later checked that the free energy change of salt formation, $$\ce{2Na + Cl2 -> NaCl}$$ has a negative $\Delta G$. What explains this? ...
5
votes
1
answer
275
views
Why does oxidation of gold with oxygen work in cyanide leaching?
Normally gold can't be oxidizes by oxygen, but in the presence of $\ce{CN}^-$ it works.
In general, I have understood that this is due to the fact that complexation $\ce{[Au(CN)_2]^-}$ decreases the ...
- 369
3
votes
2
answers
291
views
Why is silver(I) phosphate so unexpectedly thermally stable?
Silver(I) oxide is completely decomposed in air already at $\pu{300 °C}.$
Formulate the decomposition reaction and the corresponding mass action expression.
$\ce{Ag3PO4}$ can be melted at $\pu{800°C}$ ...
- 41
2
votes
2
answers
140
views
Why did industry develop mainly to fix nitrogen in ammonia (Haber-Bosch) instead of in nitrate?
Since approximately WWI, humanity has been able to fix nitrogen gas from the atmosphere ($\ce{N2}$) into compounds that are much more bio-available, like ammonia and nitrate. The first (hard) step is ...
- 129
-2
votes
1
answer
69
views
Thermal properties of chemical compounds [closed]
I have a chemistry related question, I'm doing a research on some inorganic salts (KOH, KCl) and similar compounds and I'm struggling finding the thermal properties like (thermal conductivity, ...
2
votes
1
answer
888
views
Why does copper(II) sulfate react with potassium iodide in aqueous solution?
According to the list of standard reduction potentials [1, p. 5-79] $E^\circ(\ce{Cu^2+/Cu^+}) = \pu{+0.153 V},$ while $E^\circ(\ce{I2/I^-}) = \pu{+0.5355 V}.$ Doesn't it mean that iodine has more ...
- 31
1
vote
0
answers
68
views
How can the heat equation be used to model temperature vs time in a solubility experiment?
Background:
I am doing experiments trying to map the practical solubility of a certain chemical species called an "activator" solution. This solution is essentially a sequential mixture of ...
- 500
2
votes
1
answer
231
views
Formation of AZ91 Magnesium Alloy
I have been researching on how to form AZ91 Common Magnesium Alloy which consists of 90% Mg, 9% Al, 1% Zn, 0.3% Mn. Referring to the article at here, I have read and highlighted important text and ...
- 153
5
votes
1
answer
106
views
Is there any transparent see material that can endure temperatures of 2000 °C?
I was wondering if there is a transparent material that can endure temperatures up to 2000 °C without deforming or degrading. This material doesn't have to be glass, it can be plastic or a weirdly ...
1
vote
1
answer
79
views
Evaporation of zinc oxide
My question involves the evaporation of silicate material (e.g., rocks, minerals, geologic material), specifically I am trying to work the number of electrons (n) that are involved in the evaporation ...
- 31
4
votes
1
answer
278
views
Atomization enthalpy trends. The case of Phosphorus
I was looking again at the periodic trends like Ionization Energy, Electron Affinity, Radius and so on. I understood all the general trends and the exeptions for these ones, but I can't fully ...
0
votes
1
answer
167
views
Why is octasulfur present in equation for standard enthalpy of formation of sulfuric acid?
Write a balanced chemical equation corresponding to the standard enthalpy of formation of $\ce{H2SO4}.$
\eqref{rxn:r1} is the given answer, \eqref{rxn:r2} is my answer:
\begin{align}
\ce{1/8 S8 (s) + ...
