# All Questions

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6k views

### What is an equivalent?

I want to know what is an equivalent and how is it different from equivalent mass. How to calculate and why is it used in chemistry for knowing concentration?
2k views

### Reduction of terephthalic acid to an alcohol (or phenol?)

I want to convert terephthalic acid (TPA) to an alcohol (however I think the correct term would be "a phenol"). I've read that lithium tetrahydridoaluminate ($\ce{LiAlH4}$) can produce an alcohol ...
146 views

### Do the compounds NaₓIrO₂ and NaOsO₂ exist?

Based on some physics background, I want to know whether have scientists synthesized these two materials: $\ce{Na_{$x$}IrO2}$ and $\ce{NaOsO2}$ in the lab, if so, what properties do they have? I ...
1k views

### What's the difference between mass spectrometry, mass spectroscopy, and mass spectrography?

It seems that the terms mass spectrometry, mass spectroscopy, and mass spectrography are mostly used like synonyms. Is this correct? Or is there a difference?
843 views

### How to read a given chemical formula?

I'm trying to read this chemical formula but I'm a bit confused. I'm hoping that someone could help break this down for me to explain what the various parts mean. Someone purchased epigallocatechin in ...
568 views

### Can lye be extracted from bamboo ash?

I know that the best source of lye is hardwood. A brief search tells me that Bamboo is considered a hardwood of the monocotyledon variety. I've done a lot of searching to find this answer, but I can't ...
1k views

### How to predict a COSY NMR spectra for an AMX spin system?

Does anyone know how to draw (predict) a hypothetical COSY NMR spectra for AMX spin system (the spin of A M X nuclei is 1/2)?
199 views

### Ideal gas derivations

For an ideal gas, how can someone obtain this: $$\bar{V}dP = RdT- P \bar{dV}$$ from which it can de deducted, that for a constant temperature $$\frac{dP}{\bar{dV}} = -RT$$
311 views

### explain the reaction mechanism [duplicate]

$\ce{ROH + NaBr + H2SO4 -> RBr + NaHSO4 + H2O}$ What is exactly the reaction mechanism. Is it $\ce{NaBr + H2SO4 -> NaHSO4 + HBr}$ and then $\ce{HBr}$ reacts with $\ce{ROH}$? If yes the why ...
4k views

### Decomposition products of PET

On Wikipedia, it says that polyethylene terephthalate (PET) decomposes at temperatures above 350°C. What are these decomposition products? I read further that acetaldehyde is produced, but is that ...
166 views

### Ozone catalysis

I know that catalysts don't change chemical equilibrium because they accelerate both the reactions in the same way. I can't understand why CFC catalysts accelerate ozone destruction but not ozone ...
3k views

### Why is gold sol used for intra-muscular injection?

In my textbook it is written that gold sol is used for intramuscular injection. But, actually what is its use? Why would people use such a precious element for injection. Can other colloids be used ...
7k views

### Can fluorine act as the central atom in interhalogen compounds?

Why can't fluorine be the central atom in inter-halogen compounds? A $\ce{F-F}$ bond is weaker than a $\ce{F-X}$ bond and thus, fluorine should be happy to form inter-halogen compounds. But, why ...
1k views

### Why is CCSD(T)/aug-cc-pVTZ not a suitable method for the geometry optimisation of omeprazole?

I know that CCSD(T) with the aug-cc-pVTZ basis set for geometry optimization of omeprazole (5-methoxy-2-[(4-methoxy-3,5-dimethylpyridin-2-yl)methanesulfinyl]-1⁠H-benzimidazole, the active substance in ...
301 views

### Intuitive understanding of standard electrode potential

I have read many books on standard electrode potential and they define the term in various ways but I just can’t seem to get an intuitive idea of it. $$\ce{Cu^2+ + 2e- <=> Cu}$$ Standard ...
2k views

79 views

### Explaining the reaction

i am an immunology master student without prior knowledge of biochemistry. Could someone explain me this 6 reactions ? I could learn the reactions by heart. But i want to understand, why exactly the ...
58 views

### Quantum Valence Theory Reference

At least to me, the contents of chapters 5 & 6 given here are representative of discussions on chemical bonding given in nearly all intro general & organic chem books, the statements in those ...
76 views

### What is the scaling for % completion time in a Michaelis–Menten scenario as a function of substrate concentration?

Say I have a straightforward Michaelis-Menten reaction where an enzyme $E$ at some fixed concentration $[E]$ forms an interaction complex $ES$ with a substrate $S$ (with initial concentration $[S]_0$),...
5k views

### Cheap and not messy solvent for motor oil

I have an old oil cooler of an old Volkswagen engine (the type where the oil itself is cooled, and uses no water) stained with decades of usage. If I pass water through it, it comes out clear, but if ...
24k views

### Why does ZnO turn yellow when it is hot?

Why does ZnO's color become yellow when it is hot? I have read that it is because of physical properties, but I need a more elaborate explanation.
783 views

### Units in stoichiometry

$$C_x H_y O_z$$ 1.What are the units of x,y,z.I've read that they're termed as 'stoichiometric coefficients'. 2.What is the unit of mass proportion of carbon(c) in the fuel? c=\frac{M_{carbon}}{...
3k views

### Balanced reactions at the anode and cathode [closed]

A current of 2.25 A is applied to $\ce{NiCl2}$ solution A. Write the balanced half reaction that takes place at the anode B. Write the balanced half reaction that takes place at the cathode Can ...
923 views

### What molecular features create the sensation of sweetness?

There are many compounds that taste sweet. Many of the artificial ones taste much sweeter than natural sugars (which is why they contribute little to energy intake when use as sweeteners). A range ...
30k views

### How do you determine a chemical formula given the molecule's crystal structure?

How do you determine the chemical formula of a compound given its crystal structure?
979 views

### Silver-promoted reaction of alkyl halide with diphenyl sulfide

What is the major product formed when 1-chloro-3-iodopropane reacts with diphenyl sulfide in the presence of one equivalent of $\ce{AgBF4}$? I know that sulfur is nucleophilic and that it can ...