# All Questions

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### Proof of aromaticity and antiaromaticity from generalised eigenvalue equation

In a molecule such as cyclobutadiene, 2 of the 4 molecular orbitals are half fulled nonbonding MOs, reducing the strength of the bond, the same is true for cyclooctatetraene and other 4n molecules. On ...
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### Cubic nature of van der Waals' gas equation

$V_m^3-\dfrac{RT+bP}{P}V_m^2+\dfrac{a}{P}V_m-\dfrac{ab}{P}=0$ So, At $T<T_c$ the above equation has three real roots say $V_1,V_2,V_3$, my doubt is what does this mean physically because for some ...
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### How many hydrogen environments are there in phenyl acetic acid? [duplicate]

How does the molecule below have only three hydrogen environments? Should it not have 5 different hydrogen environments according to the labelled diagram?
1 vote
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### How does coenzyme A produce proton from pyruvate ions?

Coenzyme A (CoA) is a complex molecule consisting of mercaptamine, β-alanine, pantoic acid, diphosphate, pentose, phosphate and adenine moieties: Which part of it actually plays role in the formation ...
16 views

### How is the cubic d-spacing formula derived from the Miller indices of a standard plane? [duplicate]

I just had a question about deriving the cubic structure d spacing formula. Just trying to work through the logic so I understand it better. If I start with the standard plane: • The plane ...
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### Comparing bond strength by overlapping of orbitals

Consider C-Cl and H-Cl bonds : Electronegativity difference in C-Cl bond = 0.6 Electronegativity difference in H-Cl bond = 0.95 This suggests that H-Cl bond is more polar than C-Cl bond, but not very ...
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### Is liquid carbon tetraflouride a good solvent? [closed]

At temperatures of of -180 to -130 Celcius, where carbon tetraflouride is in a liquid state, is it a good solvent?
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### quatum mechanics - calculating the initial photon wave length due to given data [closed]

the question is a part of a chemistry course with the subject of quantum mechanics and concretely the quantum model and the photoelectric effect: On the image illustrated a graph which describes the ...
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### Will the amount of the salute needed to produce a saturated solution be the same for different solutes [closed]

this type of question is a question in natural science and technology subject. It's about solvents solutes particles soluble and Solutions (as in a mixture).
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### Discovery of aspirin [closed]

In our school textbook there is a small discussion about aspirin, its structure and its synthesis from salicylic acid. But what has always fascinated me is its chemistry. I mean how scientists were ...
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### Exhaustive explanation of all electrochemical processes occurring during electrolysis of copper sulfate solution

I’m trying to gain a comprehensive understanding of what chemically occurs during the electrolysis of copper sulfate solution using copper electrodes. Some resources say only copper is deposited on ...
157 views

### Understanding the molar free energy to simulate phase separations (Na2O-SiO2)

I am a mathematician and I want to understand the molar free energy model given in Kim and Sanders (2020) Equation (1), that is, f(c,T) = RT \big(c \log(c) + (1-c) \log(1-c)\big) + \...
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### How to measure EC/ TDS?

I would like to measure the electrical conductivity of my hydroponic resovoir, with a EU plug, temperature sensor and an Arduino. I know that it is not accurate, because it will polarize, but this ...
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### Can iodide (I- ion) act as an oxidising agent? [closed]

I have this chemistry question that says iodide can act both as an oxidising agent and reducing agent. Now I understand how it can reduce something else by losing electrons going through oxidation ...
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### If we can see things lightyears away with telescopes, why can't we observe atoms? [closed]

Just wondering, since telescopes are seemingly so much more powerful than microscopes.
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### Acidification of a vicinal diol [duplicate]

The following is a question from Advanced problems in organic chemistry by MS Chouhan: The options given are: My initial thought was that this could be a pinacol–pinacolone rearrangement. However ...
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1 vote
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### Comparison of boiling points between 2‐butanol and isobutanol

Which has higher boiling points among butan‐2‐ol (1) and 2‐methylpropan‐1‐ol (2)? I know that branching decreases the boiling points, but I want to know how position of substituents affects the ...
38 views

### How does s subshell not have a node in the center despite the nucleus being there?

In most images of 1s subshell I see that there's no node shown at the center, and even the formula n-l-1 gives 0 as the answer. But, isn't the nucleus ...
20 views

### Rate of reaction between sodium thiosulfate and potassium permanganate

I plan to study the rate of reaction between sodium thiosulfate and potassium permanganate using a colorimeter. However, does anyone know if the reaction is instantaneous or not? If so, can the rate ...
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### Transition metals [closed]

Similar to the halogen that decrease in reactivity down the group, what is the trend of reactivity for transition metals? What makes a transition metal more reactivity, and why does this occur in ...
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### thermodynamic equilibrium

A thermodymic system is said to be in equilibrium if it satisfies the two conditions : 1-The system’s macroscopic properties remain constant with time. 2-removal of the system from contact with its ...
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