Chemistry Stack Exchange Community Digest

Top new questions this week:

What is the difference between chemical equilibrium and dynamic equilibrium?

Is chemical equilibrium and dynamic equilibrium the same thing? Both point to the reversible reactions and no net changes in the concentrations of product and reactant. Dynamic equilibrium from ...

physical-chemistry equilibrium concentration  
asked by Chen Yun 8 votes
answered by bgleb 11 votes

How is taste of chemical compounds determined?

How do we know the taste of compounds, and their smell too, when some of them are poisonous. My textbook had that Lead is sweet in taste, but it's poisonous. So, how exactly do we determine their ...

organic-chemistry inorganic-chemistry taste  
asked by Lyrics Master 7 votes
answered by Jan 11 votes

Does broader peak mean stronger absorber in UV/VIS?

I want to ask a question about peaks in a UV/VIS spectrum. My lecturer in our introductory course mentioned the following: Two molecules may have the same molar extinction coefficient, but if I ...

uv-vis-spectroscopy  
asked by vik1245 7 votes
answered by porphyrin 3 votes

Volatile alkali metal compounds

Most elements are or have compounds that are gases or have a significant vapor pressure at room temperature. Fluoride is a powerful tool for producing highly oxidized covalent and volatile compounds. ...

vapor-pressure organometallic-compounds alkali-metals  
asked by Kevin Kostlan 6 votes
answered by Oscar Lanzi 4 votes

Is (2R,3S)-3,4-dimethylpentan-2-ol feasible to be dehydrated with POCl3 and pyridine?

I was given a problem of reaction between (2R,3S)-3,4-dimethylpentan-2-ol and $\ce{POCl3}$ and pyridine. I know that $\ce{POCl3}$ will be attacked with hydroxyl group and the hydrogen on hydroxyl will ...

organic-chemistry  
asked by làntèrn 4 votes
answered by Aniruddha Deb 0 votes

Chromium cyanide complexes

I have rarely seen any chromium $(\ce{Cr})$ square planar complexes and I have been told that $\ce{[Cr(CN)4]-}$ is tetrahedral. So, if the statement is actually correct, are there any other known ...

coordination-compounds molecular-structure transition-metals symmetry  
asked by user35508 4 votes
answered by andselisk 7 votes

What does "parallel in-register" mean for a protein structure in a fibril?

I read a paper by Ross and Poirier [1, p. S12] which has the following lines (see section Commonalities of amyloid structure) that describe the structure of protein in a fibril: The most ...

biochemistry terminology proteins  
asked by Sriram Krishnamurthy 4 votes
answered by PCK 9 votes

Greatest hits from previous weeks:

What is the inert pair effect?

I was reading about the p-block elements and found that the inert pair effect is mentioned everywhere in this topic. However, the book does not explain it very well. So, what is the inert pair effect? ...

inorganic-chemistry quantum-chemistry orbitals periodic-trends relativistic  
asked by radiantshaw 39 votes
answered by Philipp 33 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 29 votes
answered by thomij 34 votes

Are metallic/ionic bonds weaker than covalent bonds?

In mineralogy class, I was taught that metallic and ionic bonds are weaker than covalent bonds and that's why quartz and diamond have such a high hardness value. However, in organic chemistry class, I ...

bond metal crystal-structure covalent-compounds ionic-compounds  
asked by Tamás 31 votes
answered by Shafter 18 votes

How to find pH by mixing two solutions of different concentrations?

A mixture is made by combining 110 mL of 0.15 M $\ce{HCl}$ and 215 mL of 0.055 M $\ce{HI}$. What is the pH of the solution? $$\ce{HCl -> H+ + Cl-}$$ $$\ce{HI -> H+ + I-}$$ According to ...

physical-chemistry equilibrium ph  
asked by jacob 6 votes
answered by Martin - γƒžγƒΌγƒγƒ³ 9 votes

What would be the effect of the addition of an inert gas to a reaction at equilibrium?

Why does a dissociation reaction shift to the right with the addition of an inert gas? (I am still new to the topic of equilibrium, so please explain in simple words.)

equilibrium  
asked by pcforgeek 25 votes
answered by Nick 38 votes

What is the principle of diffuse reflectance spectroscopy behind band gap measurement?

As the title suggest can you explain how DRS can be used for finding band gap of a material. Below is an DRS output result: From the figure we can see that at about 465 nm the reflectance drops ...

spectroscopy solid-state-chemistry  
asked by Eka 6 votes
answered by Ryan 7 votes

Is there an easy way to find number of valence electrons"

I want an high-school level answer. What I mean with "valence electrons" is the outermost electrons in that atoms' electronic arrangement? For example, 3 in an atom with an electronic arrangement of ...

atoms electrons orbitals  
asked by user4117 4 votes
answered by Jerry 5 votes

Can you answer these questions?

Last step of proposed cubane synthesis

I was watching an online lecture on decarboxylation by soda lime and the first few examples were straight forward but after a while a felt that the questions couldn't simply have one effect and maybe ...

organic-chemistry reaction-mechanism  
asked by StackUpPhysics 1 vote

How do I separate a graphene/graphite oxide and NaOH solution without centrifugation? (filtration didn't work)

The graphene oxide solution was made from electrolytic exfoliation of graphite electrodes in a 10M NaOH solution. Some graphene powder deposited on the bottom of the recipient but a brownish solution ...

organic-chemistry  
asked by Caju 1 vote

Why does eutectic point has three phases, but consolute point has two phases?

At eutectic point, there are three phases: solid A, solid B and homogenous liquid phase containing both A and B. But at consolute point, we are told it has 2 phases: liquid A and liquid B. Why ...

physical-chemistry thermodynamics phase  
asked by Jorge Mercent 1 vote
answered by Jorge Mercent 0 votes
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