# All Questions

28,650 questions
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### Do polar compounds move faster or slower in paper chromatography? [closed]

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 [closed]

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? [closed]

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 ...
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### 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 ($\ce{O+}$...
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### Acid medium versus Basic medium characteristics in organic reactions [closed]

I am kind new in the study of organic reactions and I have collected some points to write differences between acid medium and basic medium: Acid medium 1)favors strong oxizidation 2)favors ...
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### How to calculate gibbs free energy [closed]

How is delta G calculated gibbs free energy it says its has enthalpy in KJ/g Mol and temperature in kelvin but how is entropy measured in what units?
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### How to find concentration of three species from given molar absorptivities [on hold]

If I am given the molar absorptivities of three species at a given wavelength, and I only have the concentration of one of those species, how can I determine the concentrations of each of the ...
21 views

### How can I precipitate metal ions from a solution? [closed]

I'm in Grade 12 Chemistry. We're doing some solubility, and one of the things we need to be able to do is explain a procedure where we separate metallic ions from a solution. So, for example, how can ...
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### How does Grignard reagent form? [duplicate]

So I've read that during the formation of the Grignard reagent, The R-X bond cleaves homolytically forming free radicals. My question is how is this happeneing? Due to the high electronegativity ...
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### Can =NH2+ in Arginine's side chain form hydrogen bonding at physiological pH?

I know that at physiological pH, Arginine will have its $\ce{=NH}$ protonated to $\ce{=NH2+}$. I was wondering if this $\ce{=NH2+}$ can still form a hydrogen bond by being a donor? And does the ...
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### Other than ultracold lithium gas, are any ferromagnetic or magnetic gasses known or hypothesized?

I'm dealing with an interactive work of fiction right now, and one proposal is to combine two types of puzzles with a magnetic gas. I know that fermionic $\ce{^6Li}$, when cooled below $\pu{1 K}$, has ...
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### Ligand exchange/substitution [closed]

When ligand substitution reaction will occur with no change in either the coordination number and in the charge on the complex ion? for example, in the case co2+ with ligands H2O, NH3, Cl, C2O4 or ...
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### What gas is released when heating sulphuric acid? [duplicate]

I'm doing a chemistry project and am really unsure about the gas released when heating sulphuric acid.
588 views

### Formula of Oxone

A problem in my book asked the commercial name of sodium peroxide. The answer given was 'Oxone'. Even the website https://www.911metallurgist.com/oxone/ mentions oxone as sodium peroxide. However, ...
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### heat produced to make Fe [on hold]

For production of pure iron from $\ce{Fe2O3}$, a factory is mixing carbon monoxide with this iron oxide. Given the information below and assuming the yield 100%, how many kilowatt hours would be ...
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### Why is excluded volume in van der Waals equation divided by 2?

Source: Physics Stack Exchange The excluded volume calculated based on the diagram is 8 times the volume of a molecule. The volume is then divided by 2 to give the so-called excluded volume per ...
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### ICHO Synthesis Problem 2018

I've several doubts about this ICHO synthesis problem, which was a part of the preparatory problem package of 2018 (so yes, it's not a part of an ongoing contest) Before sharing the answer given, I'...
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### Equilibrium constant kp or kc? [closed]

In electrochemistry , nerst equation we use logkc if chemical species are in solution form but if gases then we use logkp. But kp and kc are different emf of cell will come out to be different by ...
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### Oxidation of Metals

Solid metal crystals are composed of metal cations bound to delocalised electrons whereby the metal cations exhibit a full outer shell. So why do solid metals undergo oxidation when the metal cations ...
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### Oxidation of a metal by an inorganic acid [closed]

What is the effect of particule size and temperature on the reaction of a metal and an inorganic acid? I need it for a paper that I have to hand in but I cannot find the answer anywhere and I haven't ...
28 views

### Can an iodine clock reaction work without using a strong acid?

I'm going to do an iodine clock reaction for a project and we had to submit the materials and safety sheets for the experiment a while ago. I thought I could do one by using hydrogen peroxide, sodium ...
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### How to calculate pollutant mass concentration in exhaust air?

I want to calculate the mass concentration of methane in exhaust air as unit gram per cubic meter per hour. Assumed we have the following situation: A bioreactor ...
34 views

### Safe liquid with a boiling point > 275F

Is there a non toxic inexpensive liquid which can be safely heated to 275F without worry of it combusting? It would be used to apply heat to PVC to soften it for forming. Perhaps propolyne glycol?
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### What does [O] denote in organic redox reactions? [duplicate]

I've seen a few examples in the lectures we've been having and I wasn't able to find any sources talking about it. I think I remember a previous teacher saying it was a symbol for oxidation itself, ...
410 views

### What is the maximum distance over which van der Waals forces act?

The VDW radius places a lower limit on the distance between atoms mutually attracted to one another. I am looking for the upper limit: what is the name of the concept or theory that describes the ...
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### Ideas for cheap absorbent materials for incontinence pads for use in refugee camp hospitals and the like? [closed]

Ideally fairly locally sourced, perhaps with antimicrobial properties.
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### How to know when is an enzyme activated and when it is in inhibited condition [closed]

procedure for finding optimum conditions for enzymes such as : 1)temperature 2)ion type 3)substrate 4)activators and inhibitors.