# All Questions

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### Using symmetry and group theory arguments to explain Fe^2+ (iron(II)) in a tetrahedral Td crystal field

I am trying to figure out how to explain $1s \rightarrow 3d$ spectroscopic transitions for $\ce{Fe^{2+}}$ in $T_d$ symmetry. These transitions make up the pre-edge region in K edge X-ray absorption ...
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### Understanding gas stoichiometry for the reaction of xenon and fluorine

A $\pu{20.0 L}$ nickel container was charged with $\pu{0.500 atm}$ of xenon gas and $\pu{1.50 atm}$ of fluorine gas at $\pu{400 ^{\circ}C}$. The xenon and fluorine react to form xenon tetrafluoride. ...
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### Why does increased conjugation in a molecule cause the wavelength absorbed to decrease (i.e. why does a red-shift occur)?

I was recently looking at a paper about novel organic dyes for efficient dye-sensitized solar cells and one point the authors made was that out of the two dyes mentioned the one with a larger pi-...
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### Synthesis of 1-naphthaleneacetic acid: Methods

I am trying to synthesizing 1-naphthaleneacetic acid from naphthalene and monochloroacetic acid. I found some patents and papers, and I have tried to synthesis but the yield is low. I used iron powder ...
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### Determining priority on a cyclic compound

I have problem in determining the SIP priorities in this molecule: In this ketamine molecule, what is the order of priorities? Does the carbon bonded to the ring with chlorine have higher priority ...
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### Mechanisms for Reimer-Tiemann and Kolbe-Schmidt reaction on deuterium labelled phenol

I was solving a bunch of reactions when I encountered the following: So for the first question: This is a Reimer-Tiemann reaction. I felt that the tautomerism would result in the deuterium getting ...
48 views

### Stability of α, β, γ allotropes at different temperatures

While reading about elements or compounds I often come across allotropes (or forms) being referred to as α, β, γ forms. Examples: Sulfur has two allotropes: α rhombic and β monoclinic. Out of these ...
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### Le Chatelier’s Principle chem [closed]

How would I answer a question like this on a test? Removal of one of the products of a chemical reaction has the effect of causing the reaction to go to completion. Explain this in terms of Le ...
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### How to write the Nernst Equation for this reaction?

I am required to write the Nernst equation for the following reaction: $\ce{O_2 + 4H^+ + 4e^- -> 2H_2O}$ Clearly, here $\ce{O_2}$ is getting reduced from an oxidation number of zero to an ...
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### Why does calcined feldspar crumble?

For context, I am a potter and I'm interested in collecting and processing all materials that I use by myself. One of the processes which I use is calcination of certain minerals like feldspar, so ...
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### I need to find the mechanism of a reaction

As in the title, I have a reaction to witch I need to give the mechanism.
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### Why is F a bad leaving group?

Why is F a bad leaving group? I thought that a good leaving group is one that tends to leave easily (=strong acid or weak base) and is stable (ergo a weak base or a strong acid). So wouldn't F be a ...
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### Which human protein is the most expensive energetically for the human body to create?

The human body contains between 80,000 and 400,000 different kinds of proteins. Which protein or class of proteins requires the most energy to produce?
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### How does copper oxidise alcohols?

Consider for example ethanol being heated in the presence of copper at 300 °C. How does it give ethanal as a product? Copper being in its elemental state (oxidation state 0). Since negative oxidation ...
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### Could ammonium phenolate be merely a solution of ammonia in phenol?

Could ammonium phenolate be merely a solution of ammonia in phenol? Ammonium phenolate (or phenoxide) is a liquid with a CAS number, 5973-17-1, and boiling point of 181.8$^o$C http://www.chemnet.com/...
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### Comparing acidic strengths between benzylammonium ion and phenol

Question Compare the acidic stengths between benzylammonium ion and phenol. I first tried to remove the H+ ion from both of them and tried to compare the relative stabilities of resulting conjugate ...
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### Volume percentage

When we say that nitrogen occupies 78% , oxygen 21% and other gases 1% by volume of the total volume of air, what do we actually mean by it? I am confused because I have been told that molecules of ...
16 views

### Le Chatelier’s principle Chemistry question [closed]

In caves we sometimes see large structures known as stalactites and stalagmites. These formations are made of crystals of the insoluble compound calcium carbonate, CaCO 3 (s), also known as limestone. ...
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### Vapor-pressure, realtive humidity and equilibrium confusion

I have quite an unclear understanding of relative humidity. I am writing my understanding on the topic and please correct me wherever I'm wrong: What i understood: Let's say $\ce{H2O}$ has a (...
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### How to find the percentage yield of hydrated copper(ii) sulfate [closed]

Hydrated crystals of copper(ii) sulfate-5-water were prepared by the following reactions CuO(s)+H2SO4(aq)= CuSO4(aq)+H2O(l) CuSO4(aq)+5H2O(l)= CuSO4 • 5H2O(s) In an experiment, 25.00cm3 of 2.0mol/dm3 ...
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### Order of Elementary Reactions

For the elementary reaction M→N , the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M . The order of the reaction with respect to M is: I have studied that ...
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### Procedure for laboratory synthesis of tertiary amines

I am having difficulty finding a procedure for making tertiary amines in the lab, any is fine but I am specifically interested in tributylamine.
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### Why (abundance of M+1)/(abundance of M)=(number of carbon atoms)*(1.1/100)?. Why simple unitary method and arithmetic doesnt work? derive the formula [closed]

what is the proof of the formula and how the formula works? why combinatorics and distributions have been involved in the calculation? why cannot we find the number of carbon atoms just by using ...
15 views

### How do I find the theoretical pH of a buffer solution? [closed]

A buffer solution is prepared via adding solution A (Sodium dihydrogen phosphate 27.6 gm up to 1000mL distilled water) and solution B (Disodium hydrogen phosphate 5.362gm up to 100mL distilled water). ...