# All Questions

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### Solving carbon black

I want to remove a layer of 2 mm thick carbon black on a copper bowl. I have tried different solvents, but the carbon seems to be very resistive. Which formula solves carbon black without solving ...
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### How to calculate mole fraction of each element in an ionic compound?

A solution is prepared by dissolving 518g of K2SO4 in a small amount f water and diluted it with water to a volume of 2.5L(calculate the mole fraction of water,K+,SO4-2) I got that the mole fraction ...
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### How to calculate molarity,molality, vapor pressure, freezing point, boiling point?

A solution is prepared in a cold room(4.0 C) by dissolving 118g of potassium nitrate(KNO3) in 750 mL of water. The resulting solution had a volume 745 mL. Calculate the molarity of the resulting ...
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### HCl synthesis from sulfuric acid and sodium salt

I'd like know if this is right. The reaction between $NaCl$ and $H_2SO_4$ should yield $HCl$ and sodium sulfate. This is a double substitution, true? No oxidation took place here. The thing is, when I ...
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### On the scale of stuff with a pH

I am a confused (and somewhat anal retentive) non-chemist who is trying to understand what pH is. I have come to understand it is a measure of acidity, but I have not yet figured out what that means ...
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### GAMESS Firefly Bond Dissociation Energies and Bond Energy

I'd like to calculate Bond Dissociation Energy and Bond Energy of ATP to a similar molecule. I was told GAMESS or Firefly (pcgames) are able to do this Computational Bond Dissociation Energies and ...
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### Is energy required to form bonds [phase change]

My question is if any energy is required to form bonds, for instance when there is a phase change? If I am correct, energy might be required in the beginning, to make the reaction start and then ...
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### Computational Bond Dissociation Energies and Bond Energy

I'd like to calculate Bond Dissociation Energy and Bond Energy for ATP to a similar molecule. What free (at least for academic use) computer programs will do this.
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### alpha/beta polysaccharides

In polysachharides like sucrose or any other disachhaharides , how is it that we assign whether the glycosidic bond is alpha/beta ? For example the images here: ...
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### When did the atom Theory Become indisputable?

We know that the Greeks were the first scientists (or better, philosophers) to introduce the idea that matter is made up of little “chunks”, and they named these chunks “atoms”. This idea that matter ...
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### Does a rotary evaporator need a draft chamber and a vacuum pump?

I am using DCM ( dichloromethane) in my research, as a solvent. At the end of the day I have to separate the salute and measure it. Up until now, I have been using a constant temperature oven, set a ...
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### What Could Formations of Linkage Isomers of [Co(NH3)NO2]^2+ be like ?

I am trying to draw the structure of this complex [Co(NH3)NO2]^2+ ,however I am not sure if the linkage isomers of this complex like this ;
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### Calculate the pH of a solution given [OH] [closed]

I need to calculate the pH of a solution with $[\ce{OH}^-] = 3.16*10^{-10}$. If somebody could explain to me how to obtain the answer or walk me through it that will be great.
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### Conducting current in electrolytes

I keep trying to figure out how current is conducted through an electrolyte but all I can find are BS half answers. They say the ions conduct, but the specifics are poorly explained or absent. I ...
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### Plastic: Reputable Publications

I would just like some reputable textbooks and or publication companies that have extensive research on plastics, as, for example, dealing with life cycles of plastics, degradation factors, effect on ...
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### Le Chatelier's Principle: How can the equilibrium shift, while Kc remains constant?

The answer is D. I understand that when more H+ ions are added, the reaction shifts in reverse. So I've understood that this is known as having the equilibrium shift to the left, toward the ...
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### Total magnetic moment of atom

Whenever I read about coordination compounds in my textbooks, I always find a discussion about spin-only magnetic moment which is given by $\sqrt{n(n+2)}$ BM, Where $n$ is the number of unpaired ...
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### Buffers calculating amounts of acid & base

Quick run down, I was given ph OF BUFFER 4.5 AND THEN pKa of acid 4.79 I then had to work out volume of acid and volume of base using pH=pKa+log10([a^-1]/[HA]) using that I calculated the volumes of ...
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### Markownikoff's addition to halogenated alkene?

The justification or rather intuition behind Markownikoff's rule is the stability of intermediate carbocation. The more substituted the carbocation the more stable the product. But based on this ideas ...
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### How do I know if concentration of Ammonia affected my absorbency measurements?

This is for determination of copper in a penny Lab. After making standard solutions we made a solution with a penny, dissolving it in nitric acid and adding ammonium hydroxide to form a more ...
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### Why are the vinylic bonds in alkenes slightly polar?

when searching in the internet about why are alkenes more polar than alkanes (but still they are non-polar), they are always saying that the double bond is more polarizable , i understood the whole ...
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### Degradation mechanism of hydroxymethylfurfural to 2,5-dioxo-3-hexenal and 4-oxopentanoic acid

I want to understand the degradation mechanism of hydroxymethylfurfural (HMF). According to the Wikipedia article, HMF is degraded in honey. Someone said that the degradation proceeds via 2 possible ...

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