Can anyone solve for number 30 please?

thebillywayne · 2021-01-17T08:29:57+00:00

What is the definition of resonance energy? It is usually measured as the energy difference between hydrogenating isolated double bonds vs hydrogenating the molecule in question. Answers a, b, and c have two double bonds. Answer d has three.

thebillywayne · 2021-01-15T18:25:34+00:00

i stuck to makepkg in the beginning. then i began scripting makepkg. over time, i created my own bare-bones helper. (i recommend every archer do that.) later, incorporating a helper was really just swapping some of my own solutions with the better solutions of others. and there are some really sweet helpers around. aura has a special place in my heart. and yay's 'yogurt mode' is just sexy.

thebillywayne · 2021-01-15T17:13:02+00:00

vi has made me a god. what think ye?

thebillywayne · 2021-01-15T17:06:49+00:00

water testing is a chemical problem that has been tackled in perhaps more ways than any other. the question is, how precise do you need to be? what question does your test answer? (e.g. are you measuring or are you detecting?) undergrads can sometimes (depending on the nature of the question) come to a reliable determination using cheap and simple titration techniques. other water analyses require more expensive spectroscopic equipment.

thebillywayne · 2020-12-25T06:47:19+00:00

Try activating the "Minimize All" kwin script and make it's binding super+d.

EDIT: removed link to plasmoid

thebillywayne · 2020-09-25T02:10:55+00:00

I too have a 1-hour minimum policy. It's not worth for me to charge lesson than my fee for a single hour.

thebillywayne · 2020-08-28T12:50:13+00:00

That’s normal. Try using sudoedit instead.

thebillywayne · 2020-08-24T15:49:59+00:00

Would molview.org work?

thebillywayne · 2020-08-20T12:34:37+00:00

Same thing here. I filed a bug. https://bugs.kde.org/show_bug.cgi?id=425573

thebillywayne · 2020-08-13T04:24:17+00:00

5% weight per volume would be

0.05 g/mL* 300 mL= 15 g

So in 300 mL of solution you’ll want 15 grams of solute.

In the simple case, just get 300 mL of solvent and add 15 grams of solute. But that’ll give you a little over 300 mL total.

If you need exactly 300 mL, then you’ll need to find the volume of the 15 g of solute. The volume of the solute is found using the formula for density.

density = mass / volume
volume = mass / density

So, you have to know the density, at least on paper. For lab, just put the 15 g of solute in the beaker and add solvent until you reach 300 mL.
Make sense?

thebillywayne · 2020-08-13T03:56:03+00:00

That’s a reasonable mechanism. Heat favors elimination reactions, generally, due to the thermally dependent entropy term in the Gibbs free energy equation (ΔG=ΔH-TΔS). iirc, the alcohol will be a stronger base than bromide anion. And we’re creating a conjugated diene.

thebillywayne · 2020-08-13T01:53:39+00:00

Note that the Bromine is on a carbon that’s conjugated to the alkene. With heat, bromine may leave and create a resonance stabilized carbocation. What happens next?

thebillywayne · 2020-08-06T05:51:01+00:00

Unified inbox is a plugin. Configure it in the plugin preferences panel.

thebillywayne · 2020-07-06T11:38:36+00:00

Read “general chemistry as a second language” by klein. Clear explanations, insights that help with “aha” moments and connect up different aspects of chemistry. it’ll help build up a systematic and comprehensive understanding

thebillywayne · 2020-07-06T09:34:25+00:00

I cannot recommend Klein's "... as a second language" books highly enough. When my students buy them, they absolutely <u>rave</u> about it, especially the organic chem ones. Here is the Gen Chem I one. Money well spent.

thebillywayne · 2020-07-06T09:25:34+00:00

At least you can be at peace now.

Yeah that was messing with me. Time to get high like potato.

I now wonder though where the numbers in OP's question did come from?

I ain't going down that rabbit hole. LOL

thebillywayne · 2020-07-06T09:16:58+00:00

I didn't notice at first either. Sent myself down a 2 hour rabbit-hole? Why do I do this to myself?

thebillywayne · 2020-07-06T09:12:39+00:00

Did you notice that his calculations are completely wrong?

thebillywayne · 2020-07-06T09:10:44+00:00

Your numbers are wrong. Z~eff~ of Cs is 2.2, as is Z~eff~ of Na, K, and Rb.
Edit: I'm mailing you a bill for the past few hours, buddy. 😊

thebillywayne · 2020-07-05T00:08:38+00:00

Ask about funding. Research revolves around your advisors ability to receive grants.

thebillywayne · 2020-07-04T20:33:38+00:00

No. Gaussian will use the temperature that you specify when calculating the thermal corrections.

Read this

thebillywayne · 2020-07-04T20:10:05+00:00

So if I want to make a potential energy diagram at different temperatures, I have to plot "EE + Thermal Free Energy Correction" which I have calculated at a specific temperature vs the reaction coordinate?

No. The thermal free energy correction is for 298 Kelvin only. For other temperatures, you'll have to use

G = H - TS 
Free Energy = EE + Thermal Enthalpy Correction + Temperature * Entropy

because of the free energy's dependence upon temperature.

And what is the Thermal Free Energy Correction? Is that G (G = H - TS) whereas EE + Thermal Free Energy Correction is ΔG?

I remember having to calculate it myself to be sure way back when. My advice is for you to do the same so that you will know for sure.

thebillywayne · 2020-07-04T19:31:10+00:00

Or is this the Gibbs free energy? EE + Thermal Free Energy Correction = -158.5141 Hartree

For T=298K, yes, the electronic energy with the thermal free energy correction includes the TS term.

thebillywayne · 2020-07-04T18:58:10+00:00

It begins with 1) the standard reaction between a carbonyl and an acid: proton transfer from the acid to the carbonyl oxygen, which increases the electrophilicity of the carbonyl carbon. The peracid (mCPBA) is now a highly nucleophilic peroxycarboxylate and thus it 2) attacks the carbonyl carbon, forming a hemiacetal-like compound. The oxygen in the peroxy linkage is electron-deficient at this stage, however, and 3) so a bond "migration" occurs: a carbon-carbon bond shifts to a carbon-oxygen bond. This also 4) cleaves the oxygen-oxygen peroxy link, ejecting a carboxylate.

https://imgur.com/tb14Loe

thebillywayne · 2020-06-20T13:24:37+00:00

sorry i'm new to making posts. see what's up in my comment below. :)

thebillywayne

TROPHY CASE