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Results tagged with physical-chemistry
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user 66245
The study of chemical systems using the laws and concepts of physics. This usually requires the techniques of thermodynamics, statistical mechanics and quantum mechanics.
3
votes
atomic structure ,
All these choices are arbitrary. Nobody can do justice by summarizing 200 years of atomic weights (now atomic masses) history. Atomic reference scales have changed, earlier hydrogen was taken as 1 (ex …
- 42.6k
4
votes
Accepted
Concept of Equivalent Weight
Wow, equivalent weights keep popping up again and again. It is not a nebulous term, the point is you are checking recent webpages. You have to look up chemistry books from 1930 to 60. If corona were n …
- 42.6k
3
votes
Prove Law of Chemical Equivalence
There are a couple of problems with the main gist of the question. First of all we do not need to invoke the concept of moles here. Equivalents originated in 1700, survived until the 1960s and vanishe …
- 42.6k
2
votes
Accepted
Law of equivalence
Finally your problem reads correctly! Do you recall how equivalent weights are calculated for redox species and anions? What is the charge on NO$_3^-$ ? It is -1, so equivalent weight is "molecular we …
- 42.6k
2
votes
What does it mean by " concentrations are (value) in relation to each other"?
The cation Ag+(aq) and Hg2^2+ are in an aqueous solution. Their
concentrations are 0.2 moldm^-3 in relation to each other. Find which
cation precipitates first as its iodide when a solution of …
- 42.6k
5
votes
Hydrogen peroxide generation by UV-Light
Hydrogen peroxide is surprisingly ubiquituous in the atmosphere, all you need is trace or ultratrace analytical methods. Rain water has a measurable amount of it. This is not due to pollution. It is N …
- 42.6k
5
votes
how helium can be compressed if its compressibility factor is alway greater than 1?
You have an incorrect interpretation of the compressibility factor $Z$. $Z$ being greater than unity does not mean that it cannot be compressed. All gases can be compressed (that is a part of the defi …
- 42.6k
0
votes
Why can't an electrochemical cell be a single cell?
Yes, if you dip two different metals in an aqueous solution containing ions, you will have an electrochemical cell. This is how all lemon batteries work, which consist of zinc or copper inserted into …
- 42.6k
3
votes
Volume of a solution in terms of molality, molar mass and density
Recall the definitions of molality and molarity, it is mol solute / kg of solvent and mol solute/ Vol of solution in (L). It is not kg of solution in molality. Instead of memorizing a plug and chug fo …
- 42.6k
2
votes
Accepted
Why is molar mass of a substance and atomic mass number usually the same?
The term mole is a short form of the German word Molekül which was coined by Ostwald in 1890s. At that time, the "atomic mass unit" did not exist. The common term at that time was gram atomic mass or …
- 42.6k
2
votes
Claim that the temperature of steam is not the boiling point on a stovetop?
There is a saying that "Paper never refused ink", the same goes for the web. At 1 atm pressure, if you boil water, and water vapor exist at equilibrium and the vapor pressure of water is also 1 atm a …
- 42.6k
0
votes
Electrolysis using electrodes of metals whose ions are in solution
When current flows in an electrolytic cell, the bulk solution has to remain electrically neutral. If one positive "ion" is deposited at the cathode as a neutral atom, another positive ion has to be ge …
- 42.6k
2
votes
Accepted
Stoichiometric calculation of composition of a compound
This is an example of a classical method of determining chemical formulas by elemental analysis.
You are not supposed to know the chemical formula of copper oxide neither they are asking you to write …
- 42.6k
1
vote
How to calculate membrane potentials?
Your textbook description is correct. Recall the principle of potentiometry, the potential difference is measured when there is no current flowing in the system. This is true under ideal conditions. D …
- 42.6k
1
vote
Accepted
Finding the equivalent weights of the oxide and the metal when reduced by hydrogen
Equivalents are part and parcel of Indian chemical education. I don't think college chemistry is going to be updated soon anytime there. I recently heard a complaint by a company to the chemistry chai …
- 42.6k