hermanntrude

I want to make some sodium or calcium hypochlorite to do a luminescense demo with hydrogen peroxide. I've found out you can simply take NaOH and bubble chlorine through it and you get a mixture of HCl and NaOCl. this would be fine but I don't want the HCl, since mixing it with H2O2 is bound to give badness... perhaps I could bubble Chlorine through NaOH and then neutralise the solution with more NaOH? or just stop the reaction when it's neutral?

did it work? when i tried it, I couldnt get it to respond. I thought perhaps their servers were down

and make sure you give the doctor the test-tubes so they can be examined

I've been teaching my advanced chemistry students about wave-particle duality recently. I realised during this time that it's an easy-enough concept but it's a very difficult one to teach. It's especially hard to teach to students when the student reasons in enormous leaps and bounds of complete nonsense, just to satisfy their egos by coming up with some trite BS and naming it after themselves.

here's a good website for that type of thing: sheffield chemputer isotope pattern calculator

did the egg eggsplode? hehehehe

I think it was piperidine, anyway... I can't remember for sure. I blanked a lot of it out... I was a first year pHd student and opened a bottle, and as the smell wafted around, one of the postdocs said "hermann, have you farted?" I never quite got over it.

pH = -log[[ce]H3O+[/ce]] So. If you know the pH, you find the concentration of [ce]H3O+[/ce], and since it's a strong acid, you can assume that is also the concentration of the acid.

ask your librarian. Often the library can get you an article via inter-library loan

the biomechanical systems are also enantiomeric. The common example is an enzyme and its substrate. The enzyme is purely one enantiomer, and only one enantiomer of the substrate will fit into the active site of the enzyme. It's a fact, and no-one really knows why, that ALL the complex molecules in living things are a single enantiomer

it depends on the acid and the things you know about it. If you diluted an acid that you knew the concentration of, you can use some simple math. If you have a strong acid you can use its pH to find its concentration, and if you have a weak acid you can also use the pH, but it's a bit more difficult. You can also use the density to find the concentration sometimes

Your understanding is correct. The closer an electron is to the nucleus, the more energy it takes to remove it. The fact that you have to ADD energy to the electron to get it into a higher energy orbital means that those at the lowest energy (closest to the nucleus) require MORE energy to be added.

There's a law which you may or may not have heard of, called hess's law. It states that the heat evolved or absorbed in a chemical process is the same whether the process takes place in one or in several steps. In other words, it doesnt matter if you measure the enthalpy change by breaking the C-O bond and then forming a C=O bond or if you just jump from C-O directly to C=O. the advantage of the former method is that you can do it using the numbers you've been given. essentially it works out the same.

assuming you've been given the data for the C-O and C=O bonds, I'd say you're safest using the values for C-O in "bonds broken" and C=O in "bonds formed". You'll probably also notice that the value for C=O is NOT twice the value for C-O

And it was awesome! I am still shaking from joy

Apparently it is, but so slightly that it hardly counts

I did a class for 6-year-olds once, and i brought some dry ice. I put a peice in a rubber glove and tied up the end, then continued to talk. Over the next half-hour it inflated to a colossal size, which got the kids quite excited. I also did the warm water trick so there was a "potion" on the desk. The other trick I did was to put a small peice in a round-bottomed flask and put a rubber stopper in the neck, warm the base with my hand and the rubber stopper went flying...

which part of this question is giving you difficulties? It's our policy not to answer questions but to help you understand how to answer them yourself

you need to know a few things first: the first law of thermodynamics: [math]\Delta U = q + w[/math] where [math]\Delta U[/math] is the change in internal energy and w is the work done BY the system and q is the heat absorbed by the system. The conventions for the signs are very important. When the system (the coffee cup, in this case) absorbs heat, the sign of q is positive. If the system gives off heat (loses it) the sign of q is negative. when the system does work on its surroundings (expands), the sign of w is negative, when a system has work done on it (it contracts), the sign of w is positive that should give you enough to figure it out

multiplied them by what? give an example of what you mean

seems to make sense to me... i'm not an expert on oxidation numbers for organics though... i do them for simpler stuff

tell your room mate i'm trying to teach my students chemistry, not puns

boiling is an exothermic process, in other words, the water loses heat during the rapid evaporation of steam. This is why a pot of boiling water will freeze quicker than a pot of water at room temperature when you put them both outside during winter. It's also why can happen

it doesnt react or melt or cause crystallisation to not work properly in any way?

what kind of crucible would you use to melt bismuth in? steel? copper? porcelain (expensive)?