All Questions

-1
votes
0answers
10 views

Equilibrium Acids, Bases and salts [on hold]

If the equilibrium in this equation lies far to the left, which is stronger of the two bases? explain why: CH3NH2 + NH4 = CH3NH3 + NH3
-3
votes
0answers
20 views

PHASES OF MATTER : KINETIC MOLECULAR THEORY [on hold]

Part 1. A glass bottle, which is half-filled with water, has a balloon attached to its opening. The bottle is placed in a hot water bath for some time. Explain the change to the size of the balloon ...
-1
votes
0answers
17 views

How do you use the Nernst equation on lithium ion batteries [on hold]

Anode: LiC6<=> C6 + Li+ + 1e- Cathode: Li+ + 1e- + CoO2 <=> LiCoO2 Overall: LiC6+CoO2<=>C6+LiCoO2 How do you apply the Nernst equation to this reaction? The concentration of solids is ...
-1
votes
0answers
14 views

Which bond is more polar without a table of electronegativities? [on hold]

In my AP chemistry book it says that you can determine which of two bonds is more polar without knowing the electronegativity if they have one atom in common. The more polar bond will be the one where ...
-2
votes
0answers
16 views

Schrodinger Equation : TDSE and TISE [on hold]

How can one particular Schrodinger equation be both time-dependent and time-independent at the same time? I mean its wrong by the very notion to say both simultaneously. We encounter many instances ...
-2
votes
1answer
22 views

Finding magnesium aluminosilicate mineral with a sandwich structure [on hold]

It is a mineral material with a sandwich structure, which contains $\ce{Mg^2+}$, $\ce{Al^3+}$ and many $\ce{Si-O}$ bonds.
-1
votes
1answer
14 views

pH calculation and concentrations of all species present in a solution [on hold]

When $\ce{NO2}$ is bubbled into water, it is completely converted to $\ce{HNO3}$ and $\ce{HNO2}$: $$\ce{NO2 + H2O -> HNO3 + HNO2}.$$ Calculate the $\mathrm{pH}$ and the concentrations of ...
-2
votes
0answers
16 views

Can you please tell me the process? [on hold]

The value of Kc=4.24 at 800K for the reaction, CO(g)+ H20(g) >CO2(g) + H2(g) Calculate the equilibrium concentrations of CO2, H2, CO and H2O at 800K, if only CO and H2O are present initially at ...
0
votes
0answers
16 views

will two weak acids lower their degree of dissociation when put together in solution compared to when put separately

When two weak acids are put in aqueous solutions separately they will have some value of degree of dissociation, now when both are put together will there be a decrease in their dissociations, I ...
-3
votes
1answer
26 views

Pls help confusing [on hold]

Its a chemical kinetics quedtion from jee main 2019 i got answer 10 but many places answer is 5 i thought that as reaction is first order it must be equal to half life
-1
votes
0answers
15 views

How much Sodium Bicarbonate (NaHCO3) do I need to add to specific volume of water to increase the pH by specific amount? [on hold]

I'm trying to increase the pH of a nutrient solution for algae I'm attempting to grow. I suspect that my algae will grow at a higher pH than contaminants. I want to raise the pH of a container of ...
0
votes
1answer
35 views

Why does this region fit NMR spectroscopy technique?

I was reading a paper and came across a sentence (highlighted one) about NMR spectroscopy. Several Leishmania Rabs, like Rab1, Rab5a, Rab5b, and Rab7, have been functionally characterized. LdRab5a ...
1
vote
1answer
82 views

How does the pH of salts in which the cation has acidic features and anions has basic features depend only on the relation of their constants?

My book is not very explanative about it, I'm trying to get the equation: $$[\ce{H^+}]=\sqrt{K_\mathrm{w}\times\frac{K_\mathrm{a}}{K_\mathrm{b}}}$$ but I didn't succeed, can someone explain the ...
-1
votes
0answers
12 views

To find out how much urea will separate out? [on hold]

I know how to solve the above question I will let water used be 'w' gm and then will apply the formula of decrease in free zing point and then calculate 'w' then it would be subtracted from 250 gm . ...
1
vote
1answer
33 views

What is the refractive index of poly(methacrylamide)?

I've been looking for the index of refraction for poly(methacrylamide). I searched several vendors and in https://polymerdatabase.com/ with no success. Is there any database where I can find this ...
0
votes
2answers
97 views

Reaction of orthocresol with butyrolactone in presence of AlCl3 and heat

What will be the major product of the following reaction? Please also help me with the mechanism. I'm not sure whether C- acylation or O- acylation will occur here. And if O- acylation does occur, I ...
2
votes
1answer
51 views

Why does d/l-2,3-dibromobutane on reaction with NaI/acetone give cis-2-butene?

This is what I have read/know about the dehalogenation of vicinal dihalides by NaI/acetone: The two halides which are leaving must be on opposite sides (from the mechanism). In case they are present ...
0
votes
2answers
28 views

How Can I Induce Corrosion Electrochemically?

I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
-1
votes
0answers
7 views

Determining the number of ion of a radical [on hold]

In 500 g white vitriol(ZnSO4.7H2O), what will be the exact number of ion of SO4^2- ? Any kind of clue or help will be appreciated. Thank you.
-1
votes
0answers
14 views

what is the difference between oxidation state, charge and valency? [duplicate]

Is there any specific atom or compound or molecule possessing oxidation state different from charge and valency, so that we can clearly understand the difference between the three.
0
votes
0answers
16 views

Why is a solution of salt used instead of the salt in test for sulphate ion?

I noticed that in some anion tests like carbonates, the salt is used and in some like sulphate ion the salt solution is used. Why is this so? When do you require a solution of the salt instead of the ...
0
votes
0answers
20 views

What are Technetium's physical stress characteristics?

I've looked at periodic and data tables from several sources, but none give mechanical / engineering property data on Technetium. Why is this?
0
votes
0answers
15 views

In dS≥dQ/T, material equilibrium means that there is not material changes at all or that a material change can be reversible and at equilibrium?

I am reading Levine's Physical Chemistry, I know how to arrive to that equation, but I have questions. First, $\mathrm{d}S=\mathrm{d}Q/T$ for material equilibrium, but if there is a heat flow I ...
1
vote
0answers
16 views

Why does heating glucose in the excess of HI produce n-hexane? [duplicate]

Alcohols react with acid halides such as $\ce{HI}$ to create alkyl halides, as such: $$\ce{C2H5OH + HX → C2H5X}$$ However, this doesn't seem to be the case with glucose, as the entire chain is ...
0
votes
0answers
13 views

How do I make a 0.5 M citrate buffer at pH 4.5?

I need to make a citrate-sodium citrate buffer at 0.5 M concentration and pH 4.5. I calculated the molarities of the citrate and disodium citrate based on the Henderson Hasselbalch equation, using a ...
1
vote
2answers
47 views

How To Scan “improper dihedrals” in Gaussian 09?

I am trying to parameterize Amber force field for a novel molecule, but I couldn't obtain improper dihedrals. Because if I scan impropers like dihedrals; later or sooner the molecule is overlapping ...
2
votes
1answer
41 views

Friedel-Craft reaction with amide substituent

In this question, I know that aniline will not undergo FC reaction as it forms a complex with $\ce {AlCl3}$ and precipitates out. The answer given is (c) and I agree with it. However, the benzene ring ...
-1
votes
0answers
26 views

What is the product of the mono-iodination of the following? [on hold]

What is the product of the mono-iodination of 4'-hydroxyacetophenone? Attempt at solution:
3
votes
0answers
26 views

How to derive a state symmetry in D2h point group from its wavefunction?

Let's have an atomic carbon with the following electron configuration: $$ 1s^2 2s^2 2p^2 $$ One of it's levels is ${}^1S_0$, which is corresponding with the following state: $$ \begin{align} \left| ...
2
votes
0answers
15 views

How to make equal density pool dye without diffusion

I have a leak I have been struggling to find in my in-ground pool. I am losing about 1/4" of water per day and I believe the issue is one of the fittings in the bottom of the pool. There are two ...
0
votes
0answers
40 views

Pale blue species forming during electrolysis of NaHCO3

I have a solution of 3500 ml $\ce{H2O}$ + 454 g $\ce{NaHCO3}$ in electrolysis at a potential of 12.5V using a lead anode and copper cathode. The surface areas aren't measured but they are enormous. I ...
1
vote
0answers
30 views

What would happen if you burned paper with a laser, in a vacuum?

If you hit a piece of paper with a powerful laser inside a vacuum, what would happen? It sounds like it should not "burn" and have a flame spread over the paper, as there is, of course, no oxygen. ...
0
votes
1answer
31 views

Why does copper decrease in mass when reacted with silver nitrate?

I did a lab recently of the reaction of copper and silver nitrate. $$\ce{Cu(s) + 2AgNO_3(aq) -> Cu(NO_3)_2 + 2Ag(s)}$$ I measured the mass of copper before and after the single replacement ...
0
votes
0answers
21 views

Do polar compounds move faster or slower in paper chromatography? [on hold]

I know in TLC the more polar the compound is the less it travels, and the less polar the compound is the more it travels. Would this be the same for paper chromatography?
-2
votes
0answers
13 views

Epoxide Formation for Anti-dihydroxylation [on hold]

Below I have posted my thought process for the epoxide formation in anti-dihydroxylation. I am very confused on the logic of this and would appreciate if anyone can help clarify this mechanism to me. ...
1
vote
0answers
30 views

What are the reaction products/by-products of a Tannerite explosion? [on hold]

What are the products/by-products of the following reaction of "Tannerite"? I am looking to find out if any of the breakdown products pose an environmental risk. From Wikipedia on Tannerite: "Two ...
0
votes
1answer
19 views

Potential energy curve for dissociation of cation of carbon dioxide

Can anyone suggest me some literature where I can find the potential energy curve or the electronic states for singly ionized $\ce{CO2}$ ($\ce{CO2+}$) dissociating into singly charged oxygen ($\ce{O+}$...
1
vote
1answer
22 views

Acid value of linseed oil

For this we weigh $\pu{1.015 g}$ of linseed oil which is dissolved in alcohol. 3 drops of phenolphthalein (pH indicator) are added and a solution of potassium hydroxide of concentration $C = \pu{9.5e-...
1
vote
1answer
44 views

What is the driving force for Claisen rearrangements?

I came across this mechanism (3,3 sigmatropic rearrangement). Why does the allyl vinyl ether have the ability to rearrange itself giving a new product? What drives the reaction? Is it the instability ...
0
votes
1answer
48 views

Does a C=C double bond donate electron or withdraw it?

I have learned that a $\ce{C=C}$ double bond is electron-rich because of the p-p overlap and hence can easily donate an electron pair: I agree with this statement. However, in a $\ce{C=C}$ double ...
1
vote
2answers
35 views

What is meant by forward reaction?

While reading my chemistry textbook I came across the phrase: forward reaction is favoured by decrease in temperature in exothermic reactions. I was tripped off by the term 'forward reaction', can ...
-3
votes
0answers
113 views

Sulfuric hydrofluoric acid? [duplicate]

Comment on https://www.youtube.com/watch?v=Hxh92s5mIho showing it is the effect of sulfuric hydrofluoric acid.. Is it a effect of sulfuric hydrofluoric acid?
9
votes
3answers
918 views

Complex organic molecules

I am studying astronomy and came across the following term in the astrochemistry course called 'complex organic molecules' or also written as COMs. My question is: What is exactly meant with these ...
-1
votes
0answers
30 views

How is the predictability of the periodic table useful to chemists? [on hold]

I spent about an hour on the web today searching for the answer to my question: "How is the predictability of the periodic table useful to chemists?". Thankfully, I stumbled upon this website where I ...
3
votes
0answers
24 views

Oxidative Addition - Really concerted?

I guess you are all familiar with the oxidative addition or reductive elimination reaction in organometallic chemistry. If you read further into the topic you may find different pathways like via ...
1
vote
1answer
132 views

Are all alkene geometrical isomers achiral?

I was reading a book and it tells that alkene geometrical isomers are achiral. I wanted to know that is it applicable for alkene geometrical isomers? Thanks in advance.
0
votes
0answers
12 views

why the deflection of electron from its original path increases with the increase in voltage across the electrodes [on hold]

why the deflection of electron from its original path increases with the increase in voltage across the electrodes? How is it possible, we are told that when we increase voltage velocity increases
-1
votes
0answers
19 views

What should be the IUPAC name of the following Spiro compound?

According to me it should be named as: 9-Ethyl-6-formyl spiro[5.4] dec-3-ene-1-carboxamide Please check if I am correct.
-1
votes
0answers
23 views

Which of these models represent a binary lithium compound and with which element? [on hold]

A chemist performs reactions that produce binary lithium compounds. These elements include sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine. I think the elements are chlorine ...
0
votes
0answers
21 views

My problem with Tollen's reagent [duplicate]

The formula of Tollen's reagent is $\ce{[Ag(NH3)2]+}$. What is the bond existing between the silver(I) atom and the ammonia groups? Because ammonia is stable, it doesn't need to gain or donate any ...

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