hermanntrude

i know what a nan bread is. And I also know that a type of nan bread contains almonds. I forget the name... parathi or keema or something

here's an idea: are the nan breads almond-containing ones? if they are, they contain nitrile-group-containing compounds, which might have the same effect as John Cuthber reports...

My advice is to try and save up for some iodine crystals. they go a long way... once you have some u won't need to buy any more for years. Also If you do get some, don't use more than about 0.3g of iodine for the reaction or the sound of the explosion might be hazardous to hearing. I used 0.4 g once and my ears rang for about 10 minutes afterwards

the stuff i made is messy for sure but it doesn't exactly stain glass, just leaves a thin layer which comes off with a good solvent. Mine was magnetite in parrafin (kerosene) I did see somewhere a recipe for an aqueous ferrofluid, which may or may not be less of a staining problem: LINK

The one that springs to mind is the water into wine into milk into beer demonstration. Here's the link The demonstration covers acids/bases, precipitation reactions and solutions and solubility. it is fairly dangerous. Here's what I found as a safety summary: LINK

the only line that ever worked for me was "hi, fancy some oral sex?"

Neat use of the glassware. I think it might be a specific gravity instrument for measuring the density of acids on the baume scale. my fellow instructor recently found one in the physics lab and brought it to me wondering what it was. I wouldn't have guessed it except that it said "baume" on the side, and that also looked like a giant thermometer... hang on... he uses this forum... that's not you is it? MS?

generally when summing equations, you can cancel out any compound which appears on BOTH sides of the equation after the addition is performed. It's just like algebra. if 2x + 2 + z = y + 2 + z then 2x = y Also, for instance if you have 3 water molecules on the right hand side and 2 on the left, you can cancel two water molecules from each side, leaving one on the right hand side and none on the left. it's easier to see what will cancel if you add the equations first, which gives you a long, untidy-looking equation, and then examine THAT for any possible cancellations. for instance: 1) H2O + CH3COOH --> CH3COO- + H3O+ + 2) H3O+ + OH- --> 2H2O total =H2O + H3O+ + OH- + CH3COOH --> CH3COO- + H3O+ + 2H2O now you can see there are two water molecules on the RHS, one of which will cancel with the one on the LHS, and also there is an H3O+ on both sides, so they cancel too: total = OH- + CH3COOH --> CH3COO- + H2O

try reading the course notes or your textbook. If those don't work for some reason, try wikipedia or a search engine on "annelids" and whatever other keywords are relavent at the time. One method that won't work is to list the questions on a forum and expect us to answer them for you. If there is a specific part of a specific answer that is troubling you AFTER you've done your reading, come and ask THAT question.

the statement "nothing is impossible" is a paradox. if nothing is impossible, then it is in fact impossible to have anything which is impossible, which makes something impossible, therefore the original statement breaks down.

which database do you get the MSDS from or do you just google them individually? I'm considering subscribing to something like MSDSOnline and linking to the files in the database, or more likely, i'll download the MSDS from MSDSOnline, then keep them in a folder, AND link them to the database.

i don't mean a catalogue for buying from, I mean cataloguing my own chemicals. I have approximately 500 of them and need to get them in some order. The main impetus is indeed a hard-copy for the fire department in case of emergency, but we figured since we have to do that we might as well make a functional catalogue too so we know what we have and where. I've decided to use MS Access, and i've started to learn how to use it. My trouble now is that I'd ideally like to link to MSDS files somehow through the database, but i'm not sure how. I think paper MSDS's are stupid and people never ever EVER look at the damned things, so they end up as a giant waste of space. However, if, in the catalogue, there was a link to a .pdf file which the students could be required to use before working in the lab, perhaps that'd work better

I want advice from you guys. Do any of you use a chemical catalogue for your labs? Do you use a general peice of software such as access or excel, or do you use a purpose-built peice like cispro or chemidex or something?

depends on what country you're in and what u mean by "college". In countries other than the USA, there is a distinction between "college" and "university" there are instructors at my (canadian) college who have no PhD, although many of them do.

I like it. From a teacher's point of view the IUPAC PT is a bit dodgy, since we talk about periodic trends and the PT's ability to describe the electron configuration of any element, but there are exceptions and confusing rule-additions as you go further down the table, and the f-block is almost never seen where it should be. The new one is simpler and I think many students would understand it better and quicker than the IUPAC one. I dont think its necessary to put it inside a tetrahedron, though, although it's interesting.

these statements are mutually exclusive. I have a PhD and I teach at a college. But I strongly reccomend that if you dont like research, you dont do a PhD. Go by the other route, get a degree in education.

what you need to read is here or more likely in your textbook. If you're a chemistry student, which i expect you are, read the section of your textbook on the clausius-clapeyron equation. remember that the normal boiling point of a liquid is the temperature at which its vapour pressure is equal to 1atm.

question about the ADOMAH table: on the website it states that the spd and f blocks represent equally spaces slices of a tetrahedron. Does the g-block fit into the tetrahedron? if it does, is that a coincidence or because of some equation which describes the relationship between the sizes of the sub-shells as being equivalent to the sizes of slices of a tetrahedron?

try wikipedia. I expect that will give you referenced info on at least the last two things you're looking for.

and what happened? that;s all you need to do. plug the numbers in and solve the equation for T2

Perhaps a good chemistry rule should be "if you can't spell it, don't mess about with it"

i'm diabetic too. Diagnosed when i was 8, i'm now 29. I'm very unstable, but have so far managed to control mine fairly well, although i badly want to go onto the pump, but my insurance doesn't cover it. I might pay for it with my own money.

the trouble with opinions is that they're like arseholes. everyone's got one.

that's OK. No problem. Any time.

a link from that page: LINK