Comment by Todd Minehardt on Is the negative excess volume of ethanol/water...
And so: "Is the negative excess volume of ethanol/water the cause of the OP's math error?"
View ArticleComment by Todd Minehardt on Total bond dissociation temperature
Does this answer your question? At what temperature can molecules no longer form?
View ArticleComment by Todd Minehardt on Calculating Rotational Temperature from an FTIR...
This is from a paper on HCN in planet-forming disks - and I know nothing about astro*, so this might be far off base - but the rotational temps for $\ce{HCN}$ range from 11 to 21 K (+/- some). I...
View ArticleComment by Todd Minehardt on Why do laundry detergents go bad?
Hanging out with the wrong crowd will do it.
View ArticleComment by Todd Minehardt on What is happening in experiment coating a copper...
To the person attempting to edit this and replace the word "penny" with the word "cent": in the US, it's called the penny; you would use the word "cent" to refer to the decimal portion of a price of...
View ArticleComment by Todd Minehardt on Drying salts with HCl solution
Personally, I'd go for it - back then, you'd have a scotch in one hand and a cigarette in the other. Just do it outside or in your garage.
View ArticleComment by Todd Minehardt on How are Fermi resonances between normal modes...
I think you have it backwards: the matrix element in this case is zero because you are imposing the constraint via normal modes.
View ArticleComment by Todd Minehardt on Why having a carbonyl group is not contributing...
Without more details, impossible to say (and I do molecular dynamics for a living, looking at ligand-receptor interactions). However, binding free energies via MM-PBSA are going to at best be +/- 2...
View ArticleComment by Todd Minehardt on What does the colon (the pairs of dots) mean in...
Well, it ain't an umlaut...
View ArticleComment by Todd Minehardt on Why Ca 2+ and not Ca +2
This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. -...
View ArticleComment by Todd Minehardt on Options for long term storage of helium?
This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. -...
View ArticleComment by Todd Minehardt on When optimizing AMBER molecular dynamics...
Also see the AMBER Mail Reflector, which is quite active and very likely has addressed your question at some time.
View ArticleComment by Todd Minehardt on Effect of the base/nucleophile in a reaction of...
I’m voting to close this question because what Mithron said.
View ArticleComment by Todd Minehardt on What liquid mixture has largest negative excess...
I agree with @matt_black in re: this is not a duplicate; a little Googling seems to indicate that a binary mixture of 1:1 water:ethanol is a good candidate for the answer if limited to liquid-liquid...
View ArticleAnswer by Todd Minehardt for Relation between R and k
The form of the equation is correct, but one of the variables is wrong. It should be:$$\mathrm{R} = N_{\mathrm A}k_{\mathrm B}$$The Boltzmann constant ($k_{\mathrm B}$) is for one molecule (or atom);...
View ArticleAnswer by Todd Minehardt for Using acetone instead of acetonitrile on...
Yes - reports are easily located using a search engine and keywords such as "HPLC", "acetone", "green chemistry", and "acetonitrile":One abstract here:The use of acetone as a substitute for...
View ArticleAnswer by Todd Minehardt for Why is carbon monoxide not a greenhouse gas?
$\ce{CO}$ is not considered a primary (or significant) greenhouse gas due to the weak (but non-zero) absorption of energy in the infrared. However, it does increase global warming by reacting with...
View ArticleAnswer by Todd Minehardt for Is sugar necessary for the sweetening effect of...
Most of the sweetening is done by using sugar alcohols such as xylitol, which allows producers to legitimately claim that there is "no sugar" in their products, as long as "sugar" is considered in the...
View ArticleAnswer by Todd Minehardt for Can 32% hydrochloric acid be stored in a milk...
According to this chart from a manufacturer of plastics, HDPE is resistant to concentrated $\ce{HCl}$ acid as well as to copper salts (other manufacturers report the same - Google if needed). As...
View ArticleAnswer by Todd Minehardt for Infrared Spectroscopy of N2O
I don't know what flex and link voltage are; however, here's the rest of it as per this site at UCLA and this homework solution key from Illinois State:The $\ce{N-N}$ stretch is at $\pu{2200 cm-1}$,...
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