# All Questions

28,646 questions
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### 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
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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.
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### 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 ...
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### 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 ...
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### 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 ...
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### 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
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 . ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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.
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### 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.
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### 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 ...
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### 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?
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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:
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### 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?
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### 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. ...
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### 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 ...
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 ($\ce{O+}$...