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Top new questions this week:

m-CPBA Selectivity between Baeyer Villiger Oxidation and Epoxidation?

If both a ketone and an alkene are present in a molecule and you add one equivalent of m-CPBA, what are the factors that determine which group will be oxidized, the ketone through Baeyer-Villiger ...

organic-chemistry organic-oxidation chemoselectivity epoxidation  
asked by sweetandtangy 10 votes
answered by Waylander 8 votes

Does motor oil get more viscous when heated & what is the meaning of the SAE motor oil code?

The motor oil in my 2004 Pontiac Vibe is 5W-30. My (incorrect) understanding of this SAE nomenclature is that 5W means "Viscosity index of 5 in the winter" (or when really cold - like $\pu{-30 ...

everyday-chemistry temperature hydrocarbons viscosity  
asked by Shrout1 7 votes
answered by Mathew Mahindaratne 14 votes

Example of chemical reaction with a given form for the kinetic equations

I’m an applied mathematician looking for examples from various applications fields (right now, chemistry, obviously) to illustrate the following reaction-diffusion system $$ \begin{cases} ...

kinetics theoretical-chemistry  
asked by Elvith 5 votes
answered by Elvith 0 votes

Electrolytic Refining of Silver Nitrate

I read that the electrolytic refining of Silver is done using dilute silver nitrate as an electrolyte and a small percentage of free $\ce{HNO3}$. The following reactions are possible at the anode: ...

inorganic-chemistry electrochemistry electrolysis metallurgy  
asked by Chopin 5 votes
answered by Mathew Mahindaratne 4 votes

Is the effect of hydroperoxyl radicals significant in the oxidation of organic compounds in the Fenton reaction? Why or why not?

In the Fenton reaction, a ferrous catalyst and hydrogen peroxide are used to generate hydroxyl radicals which in turn oxidise organic compounds. The reaction is commonly seen in the treatment of ...

organic-chemistry reaction-mechanism redox kinetics  
asked by Ethan S 5 votes
answered by Ethan S 0 votes

Why are excess nuclei required to produce an NMR signal?

In NMR, an excess population of nuclei is required to produce a signal. If saturation is achieved (same number of nuclei in the α and β states) no net signal can be produced. A signal is produced when ...

spectroscopy nmr-spectroscopy  
asked by Eli Jones 5 votes
answered by orthocresol 7 votes

What is the shape of [Cr(NO)₄]?

I was learning about crystal field theory recently. I am quite confused about predicting the shape of $\ce{[Cr(NO)4]}$ complex because I am not able to conclude whether it will be square planar or ...

inorganic-chemistry coordination-compounds molecular-orbital-theory crystal-field-theory ligand-field-theory  
asked by Chem-Learner 4 votes
answered by Oscar Lanzi 3 votes

Greatest hits from previous weeks:

What is the definition of of 'compound', 'mixture', 'element' and 'molecule'?

I am looking for the precise definitions, as I am very confused as to what they are exactly because although I mostly understand what they mean, I have encountered some conflicting definitions that ...

terminology  
asked by Sophia 22 votes
answered by Anti Earth 18 votes

What is the difference between D and L configuration, and + and −?

What is the difference between D and L configuration, and + and −? My textbook says they are two different things. It also says that the correct way to name glucose is D(+)-glucose. Could someone ...

nomenclature stereochemistry  
asked by Mahathi Vempati 21 votes
answered by Dean 26 votes

How to dissolve candle wax (paraffin)?

Wikipedia states that waxes can be dissolved by non-polar organic solvents. I failed to dissolve candle wax in both acetone and ethanol, which are the only organic solvents I have at home. I have ...

everyday-chemistry solubility fats  
asked by Tomáš Zato - Reinstate Monica 13 votes
answered by Yomen Atassi 16 votes

How do I calculate the degree of dissociation in equilibrium?

In my textbook, for calculating the percentage dissociation of $\ce{HF}$ for the given equation: $$\ce{HF + H2O <=> H3O+ + F-}$$ The solution is: Initial Concentrations $$[\ce{HF}] = ...

acid-base equilibrium  
asked by Bunny Rabbit 12 votes
answered by Ashu 15 votes

Difference between thermodynamic and kinetic stability

What is the difference between thermodynamic and kinetic stability? I'd like a basic explanation, but not too simple. For example, methane does not burn until lit -- why?

thermodynamics kinetics stability  
asked by Cyrus 37 votes
answered by thomij 44 votes

How come water would not affect the results of a titration?

We were told to rinse the buret with the base so that the concentration won't be messed up, but when it comes to the flask that is going to hold the acid, there is no need to rinse, because it would ...

experimental-chemistry analytical-chemistry titration  
asked by Mandy Quan 2 votes
answered by LDC3 4 votes

How to determine the most stable carbanion?

Which of the following carbanions is the most stable? I think the answer is either a or c, as in d there are no chances for the carbanion to have its charge become less. In b I think there ...

organic-chemistry stability  
asked by Adesh 14 votes
answered by Keerthana A.K. 8 votes

Can you answer these questions?

Can the titrant and the unknown material be flipped?

We know the typical experiment of determining the concentration of $\ce{Fe^2+}$, where we titrate $\ce{MnO4^-}$ which has dark purple color and watch the color of the bottle. Can we also determine ...

titration  
asked by Mather 2 votes
answered by M. Farooq 0 votes

Get fractional coordinates from special Wyckoff positions (IUCr)

I'm trying to get the fractional coordinates for Mo and S, for MoS$_2$-2H, where 2H means the phase. MoS$_2$-2H is a bilayer, in which each layer is separated from each other by Van der Waals forces. ...

crystal-structure stability crystallography atomic-radius  
asked by Jose Marin 2 votes

Lowering the freezing point of a lipid by adding another lipid

I'm trying to stop bacon grease from congealing in the fridge by adding another lipid with a lower freeze point to it, but I'm not sure how much to add, as I'd like to keep the ratio as bacon-grease ...

thermodynamics everyday-chemistry phase food-chemistry  
asked by Marcellus 1 vote
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