Chemistry Stack Exchange Community Digest

Top new questions this week:

What is the difference between "vapour" and "gas"?

I have read the definition of vapour on Wikipedia, but I don't seem to have a clear idea about the difference between a vapour and a gas. I know what it means when it says, "gas at a temperature ...

thermodynamics temperature vapor-pressure liquids  
asked by Goarkz 12 votes
answered by Nat 2 votes

What happens inside salt bridges?

I don't understand how a salt bridge work exactly: what happens inside it and how it affect the cell's lifetime. I have already read: Salt Bridges/Porous Disks Salinic bridges in voltaic cells ...

electrochemistry  
asked by Stanislas Dousset 10 votes
answered by Surprised Seagull 4 votes

Does iron(VI) fluoride exist?

Why does $\ce{FeF6}$ not exist? There are hexavalent iron compounds, so that is not the problem. There is the $\ce{[Fe(CN)6]^3-}$ ion, so there doesn't seem to be a steric problem.

inorganic-chemistry coordination-compounds transition-metals  
asked by Thomas Forster 8 votes
answered by Oscar Lanzi 4 votes

Why use Km in catalytic efficiency?

The catalytic efficiency of an enzyme is given by $k_{cat}/k_M$ where $k_{cat}$ is the turnover number, or the number of molecules that can be produced per second per active site of an enzyme. $K_{M}$ ...

kinetics enzymes enzyme-kinetics  
asked by John Hon 7 votes
answered by Andrew 6 votes

How to compare stability between 5‐methylcyclohexa‐1,3‐diene and 3‐methylenecyclohexene?

Problem Compare stability of 1 and 2: Answer My approach Both have the same number of π-bonds. Both have one resonance structure. Both are non-aromatic. In 1 there are three α-hydrogens, whereas ...

organic-chemistry stability resonance hyperconjugation  
asked by Vega 7 votes
answered by Light Yagami 7 votes

Why is sea salt coarse?

What makes sea salt coarser than other salt? I have tried checking online but no one seems to discuss this. It seems that the grain of sea salt is larger, but I don't understand since the salt is ...

inorganic-chemistry thermodynamics solid-state-chemistry recrystallization salt  
asked by Avrohom 6 votes

Balancing reaction between copper and nitric acid given the ratio of formed nitrogen oxides

Problem $\ce{Cu}$ reacts with $\ce{HNO3}$ according to the equation $$\ce{Cu + HNO3 -> Cu(NO3)2 + NO + NO2 + H2O}$$ If $\ce{NO}$ and $\ce{NO2}$ are formed in 2:3 ratio, what is coefficient of $\ce{...

inorganic-chemistry redox aqueous-solution stoichiometry  
asked by Hannah Montana 6 votes

Greatest hits from previous weeks:

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 23 votes
answered by Ben Norris 30 votes

Is there an easy way to remember charges on ions?

I have a chemistry test coming up and I might need to know the charge that goes with the different ions like $\ce{SO4}$ has $-2$, $\ce{NO2}$ is $-1$ and $\ce{PO4}$ is $-3$. Is there an easy way to ...

physical-chemistry ions  
asked by Chef Flambe 11 votes
answered by Mark 10 votes

Can an atom have more than 8 valence electrons? If not, why is 8 the limit?

According to some chemistry textbooks, the maximum number of valence electrons for an atom is 8, but the reason for this is not explained. So, can an atom have more than 8 valence electrons? If ...

physical-chemistry electrons electronic-configuration valence-bond-theory  
asked by moonw 174 votes
answered by Terry Bollinger 96 votes

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?

electronic-configuration  
asked by Madhav Sudarshan 5 votes
answered by Ben Norris 11 votes

Difference between shells, subshells and orbitals

What are the definitions of these three things and how are they related? I've tried looking online but there is no concrete answer online for this question.

quantum-chemistry electrons electronic-configuration orbitals  
asked by Amuna 35 votes
answered by thomij 42 votes

What's the difference between alpha-glucose and beta-glucose?

What's the difference between $\alpha$-D-glucose and $\beta$-D-glucose? Are they isomers? Or do they differ in their elemental composition?

stereochemistry isomers carbohydrates  
asked by becko 17 votes
answered by Ben Norris 29 votes

Why is DNA negatively charged and what makes it so?

What part in the strand contributes to the overall non neutral charge? DNA is not isolated in the body, so what keeps it stable while being charged? Why is it important for DNA to be charged?

biochemistry dna-rna organophosphorus-compounds  
asked by Sparkler 8 votes
answered by antortjim 19 votes

Can you answer these questions?

Flavonoid Xanthine Oxydase Inhibitors vs Hydroxychloroquine

Regarding COVID-19 and hydroxychloroquine (HCQ), HCQ is known to increase pH in lysosomes by 1-2 orders of magnitude, and also results in lethal intracellular heme overload in parasites responsible ...

radicals  
asked by nxglogic 2 votes
answered by nxglogic 0 votes

What is the amount of UV light required to make fluorophores glow and what is the minimum amount of electricity needed to achieve this?

So I have heard that fluorophores glow under UV light, so I was wondering what is the minimum amount of UV light needed to make the fluorophores glow and what would be the minimum amount of ...

fluorescence light  
asked by Aster17 2 votes

How thick is the colored oxide layer on heat treated stainless steel?

When stainless steel is welded, or just heat treated, it will develop a thicker oxide layer, which in some cases is is rainbow colored, but can become so thick as to appear almost black. From the ...

metallurgy surface-chemistry oxides  
asked by James Gaidis 2 votes
answered by blacksmith37 0 votes
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