Chemistry Stack Exchange Community Digest

Top new questions this week:

The major product of radical halogenation: Why is it a halogen attached to a primary carbon and not a tertiary carbon in the given example?

There's this problem that I saw in my Organic Chemistry book: The reaction between $\ce{(CH3)3CH}$ and $\ce{Cl2}$ forms two products: $\ce{(CH3)2CHCH2Cl}$ (63%) and $\ce{(CH3)3CCl}$ (37%). Why is the ...

organic-chemistry radicals halogenation  
asked by blair Score of 6
answered by Infinite Score of 8

Is There a Problem with the Assignment of Stereochemical Descriptors by ChemDraw in Select Examples?

While using ChemDraw Professional to construct some cyclic allenes and rotationally restricted biphenyls, I came across anomalous assignments of stereochemistry. [For the latest version of ...

organic-chemistry stereochemistry software chirality  
asked by user55119 Score of 4

Calculate frequency dose from different light intensities

The quantum yield for homolytic O-O cleavage of (CH$_3$)$_3$COOC(CH$_3$)$_3$ at $266$ nm is $0.21$. In one experiment, a pulsed laser of this wavelength was used to induce the formation of t-butoxyl ...

radicals electromagnetic-radiation light  
asked by katara Score of 3

Mathematical models of Vaporization-Condensation dynamics

I am a mathematician now studying an introductory chemistry course. Consider a liquid in a closed container, at (say) room temperature. Then some of the liquid will vaporize. Then some of the ...

thermodynamics equilibrium reference-request vapor-pressure  
asked by Asaf Shachar Score of 2
answered by theorist Score of 4

Understanding the molar free energy to simulate phase separations (Na2O-SiO2)

I am a mathematician and I want to understand the molar free energy model given in Kim and Sanders (2020) Equation (1), that is, \begin{equation} f(c,T) = RT \big(c \log(c) + (1-c) \log(1-c)\big) + \...

physical-chemistry thermodynamics polymers glass  
asked by Henning Score of 1
answered by Jon Custer Score of 4

Comparison of boiling points between 2‐butanol and isobutanol

Which has higher boiling points among butan‐2‐ol (1) and 2‐methylpropan‐1‐ol (2)? I know that branching decreases the boiling points, but I want to know how position of substituents affects the ...

organic-chemistry alcohols boiling-point  
asked by Neutral Me Score of 1

How does the redox reaction in a voltaic battery pile start?

From the Wikipedia article, the redox reaction for a voltaic pile is: \begin{align} \text{Oxidation:} && \ce{Zn &-> Zn^{2+} + 2e^-}\\ \text{Reduction:} && \ce{2H^+ + 2e^- &-&...

asked by Nick Score of 1
answered by Maurice Score of 1

Greatest hits from previous weeks:

Reaction between NaOH and CO2

So I wanted to know what the reaction between sodium hydroxide and carbon dioxide can be, and upon research I got 2 answers. The first one is $$\ce{CO2 + NaOH(aq) -> NaHCO3(aq)}$$ and the second ...

inorganic-chemistry acid-base reaction-mechanism aqueous-solution  
asked by user510 Score of 5
answered by user213305 Score of 4

How to convert g/L to mol/L

I know I should divide $\pu{g L-1}$ by the molar mass of the substance, but I don't seem to find the specific answer on Google. So just to be sure: If I have $10^{-5}~\pu{g L-1}~\ce{Cu^2+}$ solution, ...

concentration stoichiometry units  
asked by Ndrina Limani Score of 2
answered by bon Score of 8

Difference between electropositivity and electronegativity

Sodium is more electropositive than hydrogen although they are in the same group. Why is the electronegative value of hydrogen greater than sodium (metal)?

inorganic-chemistry electronegativity  
asked by Rasheed Khan Score of 5

How do I type a simple chemical equation in Microsoft Word?

How do I type a simple chemical equation in Microsoft Word? I can do subscripts, but long arrows are more difficult. I can't get them to align with the text. Also, I can't figure out how to put a ...

software notation  
asked by Sualeh Fatehi Score of 24
answered by Ben Norris Score of 31

What is the difference between the KLMN and SPDF methods of finding electronic configuration?

I've always been puzzled by this because my teachers happen to use only the KLMN method, but what is the difference between the KLMN and SPDF methods of finding electronic configuration?

asked by Madhav Sudarshan Score of 5
answered by Ben Norris Score of 11

Preparation of iodine solution

How to prepare $\mathrm{0.1M}$ $\ce{I_2}$ solution. I have found in books that it should be prepared in $\ce{KI}$ solution but none of them explains why? Please explain in detail not just the ...

asked by user3236187 Score of 6
answered by Yomen Atassi Score of 14

Why does zinc react with sodium hydroxide?

If zinc is less reactive than sodium, then why does it still react with sodium hydroxide?

redox metal reactivity  
asked by Daksh Shah Score of 19
answered by Wildcat Score of 30

Can you answer these questions?

Why probability for an atom is fraction for population?

In the canonical ensemble the probability of finding an atom (or molecule) in its $i$-th energy state is given by the Boltzmann factor. This probability is interpreted as the number of microstates ...

physical-chemistry statistical-mechanics  
asked by Anton Score of 1

Solvent for Terephthalic Acid TLC

We're trying to do thin layer chromatography to assess the purity of Terephthalic Acid. So far we have tried DMF, and Water of different pH values. Does anybody know a better solvent or combination?

asked by KlausHaarmann Score of 1

I need to test fabric for arsenic, and I've found 141-year-old guidance. Is it legit?

I'm a book and paper conservator, and a few years ago had four books to restore. Their endpapers were this gorgeous green silk, but they were badly dry rotted, and needed to be removed. I suspected ...

inorganic-chemistry experimental-chemistry hydrogen dye  
asked by Kristi M. Score of 1
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