All Questions

Filter by
Sorted by
Tagged with
3
votes
0answers
10 views

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 ...
3
votes
1answer
4k views

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. ...
-1
votes
0answers
7 views

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-...
-1
votes
0answers
10 views

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 ...
1
vote
0answers
30 views

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 ...
2
votes
2answers
61 views

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 ...
2
votes
2answers
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 ...
-2
votes
0answers
6 views

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 ...
0
votes
0answers
8 views

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 ...
4
votes
0answers
23 views

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 ...
-1
votes
0answers
8 views

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.
-1
votes
0answers
6 views

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 ...
-1
votes
0answers
11 views

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?
0
votes
2answers
44 views

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 ...
0
votes
0answers
6 views

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/...
5
votes
1answer
91 views
+50

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 ...
-2
votes
1answer
16 views

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 ...
-1
votes
1answer
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. ...
2
votes
1answer
25 views

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 (...
2
votes
2answers
766 views

Why is the boiling point of trichlorofluoromethane lower than that of chloroform?

If $\ce{CFCl3}$ has a higher molar mass, how come $\ce{CHCl3}$ has a higher boiling point? $$ \begin{align} \mathrm{bp}(\ce{CFCl3}) &= \pu{23.77 °C} \\ \mathrm{bp}(\ce{CHCl3}) &= \pu{61.15 °C} ...
-1
votes
0answers
13 views

Mechanistic detail for Dehydration of benzaldoxime with acetic anhydride reaction [closed]

Please draw out and explain the mechanism for Dehydration of benzaldoxime with acetic anhydride rection. I'm struggling to find anything about it. Thank youuu :)
0
votes
1answer
3k views

How can you make magnesium carbonate?

I am trying to start my own gym company that sells gym chalk however I have not been able to find a good process for making good magnesium carbonate. I have tried mixing equal amounts of magnesium ...
2
votes
0answers
25 views

Titration of weak acid and strong base at low concentrations [duplicate]

Titration continues until one of the reactants (the one in conical flask) turns out to be a limiting agent as far as I know. From the titration of a weak acid and a strong base, I could learn that the ...
3
votes
2answers
3k views

Why is temperature constant when an ideal gas expands into a vacuum?

An ideal gas in a box has pressure $p$ and temperature $T$. This box is kept in a vacuum, within a large container. When the box is punctured, what happens to the temperature of the gas as it expands ...
-3
votes
0answers
33 views

Acids give H+ in a reaction thus called reducing agent. But according to Lewis theory of acid and base, anything accepting pair of electron is acid [closed]

Now as acids accept electrons and so must be called oxidizing agent. and I feel it to be a bit contradicting. please clarify if any misconception
1
vote
1answer
51 views

Hydration vs Dissolution

While revising Thermodynamics and Thermochemistry from revision material published by Arihant publications I encountered the following mentioned statement. During dissolution, the physical state of ...
1
vote
1answer
99 views

Reduction of epoxide

Does $\ce{LiAlH4}$ and $\ce{NaBH4}$ reduce an isolated epoxide? I have two books where both are saying differently. One says it can and other says cannot. On searching the web there was no definite ...
1
vote
1answer
50 views

What is exactly molar conductivity?

I know molar conductivity is conductivity of solutions by molarity, but then I see on next page of my book it defines molar conductivity $\Lambda$ as follows: $$\Lambda = \frac{\kappa a}{l},$$ where $...
-1
votes
0answers
26 views

Comparing rate of dehydration

First I made the products and tautomerised them As the conditions for dehydration are not mentioned so I assumed acidic conditions. This means that all the compounds would follow $E^1$ mechanism. This ...
-4
votes
1answer
23 views

Determining difference between co-ordination complexes of copper [duplicate]

What's the difference between the co-ordination compounds $\ce{Co.(H2O)6}$ and$\ce{[Co(H2O)6]^2+}$?
0
votes
0answers
22 views

Preparation of phosphate buffer of ph 7.4

Can I make a phosphate buffer of pH 7.4 starting with phosphoric acid and then adding NaOH until the pH reaches 7.4. What are the disadvantages of using this method over sodium phosphates?
4
votes
1answer
190 views

(E)-2-bromo-1,4-difluoro-3-iodobut-2-ene or (E)-3-bromo-1,4-difluoro-3-iodobut-2-ene

I am struggling with naming this structure either (E)-2-bromo-1,4-difluoro-3-iodobut-2-ene or (E)-3-bromo-1,4-difluoro-2-iodobut-2-ene. I am aiming at the question whether there is also a ...
-3
votes
0answers
17 views

Contrast the unstable electron-deficient cationic intermediate with the stable pyridinium ion

Why is the pyridinium ion not unstable, such as an unstable electron-deficient intermediate cation in electrophilic aromatic substitution, after the pyridinium ion has a positive charge on nitrogen?
2
votes
0answers
97 views

Where will halogenation take place?

In the following halogenation reaction: At which position will halogenation take place? It is obvious that the halogenation will take place at a 3° Carbon atom (the rates of halogenation for ...
0
votes
0answers
40 views

How can I weigh the compound that melts at room temperature?

I am conducting an organic synthesis experiment involving 2,3,5-tribromothiophene. The melting point of 2,3,5-tribromothiophene is about 25-28 ℃, so it melts easily during weighing. Whenever I weigh ...
8
votes
2answers
409 views

Visible Light Spectrophotometer Recommendations

I’m looking into purchasing a cheap uv-vis spectrophotometer but am not affiliated with an institution at the moment given the whole COVID 19 situation. Are there any good recommendations for cheap ...
2
votes
0answers
76 views
+50

How stable is Remdesivir when vial vacuum is broken and/or it is reconstituted with sterile water?

I was recently looking at how long can Remdesivir be stored in its different forms. I came up across several articles provided by the FDA and Gilead Sciences and others. What caught my eye was the ...
2
votes
1answer
51 views

Correct Rate Equation for a Reversible Reaction

I'm helping my son with Matlab as he is having trouble learning differential equations as they apply to chemical kinetics. His task is to solve for the equilibrium concentrations for a reaction $$\...
-2
votes
0answers
14 views

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 ...
2
votes
2answers
2k views

Using significant figures when measuring with an instrument with marks other than powers of ten

If an instrument does have markings that are powers of ten, then finding the precision of the instrument is easy. For example, if a graduated cylinder had markings for every $\pu{0.1 mL}$, or every $\...
2
votes
1answer
155 views

Balancing a redox reaction involving ammonium dichromate and sodium sulfite

I have got this redox reaction: $$\ce{(NH4)2Cr2O7 + H2SO4 + Na2SO3 + H2O -> Cr2(SO4)3 + (NH4)2SO4 + NaOH}$$ I need to balance it. I have no problem with finding what elements change their oxidation ...
0
votes
1answer
82 views

Tracing an Energy Time diagram

I'm looking for data to create a simple graph of an exothermic or endothermic reaction but can't find any. Could someone help me with some enough data to create a Energy(time) simple graph.
-2
votes
1answer
54 views

Is bromo(iodo)fluoro(chloro)methane possible?

So this compound is supposed to have all of the stable halogens a part of this molecule ,fluorine,chlorine ,bromine and iodine. Is it really possible? Link :http://wiki/...
-2
votes
0answers
19 views

Determining the direction of electron transfer in a coordinate bond

I am curious as to how electron transfer takes place in a co-ordinate bond in complexes. Take for example, the nitrito-$\ce{O}$ molecule, where $\ce{M}$ is a metal, $$\ce{M<—O—N=O}$$ In the ...
-1
votes
0answers
33 views

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 ...
1
vote
0answers
35 views

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.
-3
votes
0answers
13 views

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 ...
-2
votes
0answers
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). ...
2
votes
1answer
6k views

How does iron rust in basic conditions?

I performed an experiment about the corrosion of iron. I used acid and base in the experiment. I understand that the acid speeds up the corrosion of iron. But I don't understand why the base also ...
5
votes
0answers
139 views

Can cis-trans isomers have same InChI?

From all we know only tautomers should get the same InChI key, or, in case of the second block, if there are lots of stereo centers. However these cases are just collisions, they still have different ...

15 30 50 per page
1
2 3 4 5
770