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The study of chemical systems using the laws and concepts of physics. This usually requires the techniques of thermodynamics, statistical mechanics and quantum mechanics.

7
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[…] my teacher told me to continue using a trial and error method […] But nobody told you to do it manually once you have understood how to adjust the Rydberg constant for $\ce{He+}$ and use the …
answered May 20 '15 by Klaus-Dieter Warzecha
2
votes
[…] there are $1\cdot10^{-7}\ \ce{OH-}$ […] ions Are you sure that this is an absolute number or rather a concentration in $\mathrm{\frac{mol}{L}}$? IN the latter case, what would be the concentr …
answered Feb 28 '15 by Klaus-Dieter Warzecha
6
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If it is so, then why do we call glowing objects in the dark as fluoroscent? I think this is just marketing: most people have heard the term fluorescence, while phosphorescence or luminescence ar …
answered May 12 '15 by Klaus-Dieter Warzecha
3
votes
\[ \left< r_{nl} \right> = n^2\cdot a_0\ \left\{ 1+ \frac{1}{2} \left[1-\frac{l(l+1)}{n^2}\right] \right\} \] should be close to what is applicable to solve to problem in a simple way. If the value i …
answered Feb 14 '14 by Klaus-Dieter Warzecha
0
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I know that catalysts don't undergo chemical changes during a reaction [...] They don't? How then, other by forming a complex with the starting material, is the activation energy of that reaction …
answered Feb 28 '14 by Klaus-Dieter Warzecha
11
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In the crystal, carboxylic acids mostly form dimers through pairs of $\ce{OH\bond{~}O=C}$ hydrogen bonds. In some cases, infinite chains of hydrogen bonds are formed instead: here, each carboxylic ac …
answered Apr 17 '15 by Klaus-Dieter Warzecha
2
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Your tutor is a master of confusion :-D Would the exercise be easier if the pressure was given in stones per square acre? ;-) Write down the equation for the ideal gas law again. Pay attention to th …
answered Jan 18 '14 by Klaus-Dieter Warzecha
3
votes
[...] some of the nitrogen is lost and forms something [...] Carbon is a good and cheap reductant, often used in the processing of oxidic ores - except when metal carbides are formed. Carbon diox …
answered Mar 17 '14 by Klaus-Dieter Warzecha
2
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I am not aware of any current claim on "cold fusion" that could hold up against a scientific re-examination. Previous reports by Pons and Fleischmann now seem to be (mis)led by wishful thinking and di …
answered Mar 10 '14 by Klaus-Dieter Warzecha
2
votes
There is a fundamental difference between both models. Langmuir's model was a theoretical construct, while the Freundlich isotherm is empirical. In the Langmuir model, it is assumed that at maximum …
answered Feb 11 '14 by Klaus-Dieter Warzecha
4
votes
So their rate is equal to the constant k. With other words, the change of concentration over time is linear: \[ \frac{d[\ce{A}]}{dt} = k\]
answered May 4 '15 by Klaus-Dieter Warzecha
1
vote
The concentration of your acid is given as a mass concentration. Without knowing the molar mass, the molar concentration and the amount of substance in a volume of $15~\mathrm{cm}^{-3}$ are not acce …
answered Dec 1 '16 by Klaus-Dieter Warzecha
1
vote
In order to "make" hydrazine, $\ce{H2N-NH2}$ from hydrogen and nitrogen atoms, you have to break $\ce{N2}$ once, giving 2 nitrogen atoms break $\ce{H2}$ twice, giving 4 hydrogen atoms form one $\ce{ …
answered Mar 17 '15 by Klaus-Dieter Warzecha
1
vote
Methacrylates make nice starting materials for the lightinduced polymerization. In methyl methacrylate (MMA), camphorquinone (a typical initiator) has an absorption maximum around $\lambda$ = 473 nm …
answered Mar 13 '14 by Klaus-Dieter Warzecha
2
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Just a hint to get you started From the balanced reaction equation , it seems that $$K_p = \frac{p_{\ce{NO}}^2 \cdot p_{\ce{O2}}} {p_{\ce{NO2}}^2}$$ The relation between $K_p$ and $K_c$ is given …
answered Dec 18 '16 by Klaus-Dieter Warzecha

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