hermanntrude

i know those cuboidal 9V batteries make sparks, as do the bog 6V batteries. Never come across a 7.2 V battery though.

you could do this on foot at the poles. Just walk around in a circle in 24 hours. you'd get pretty cold, though :0)

I read somewhere that they're considered to be unstable, and are condensing to form moons as we speak, but they're just doing it very slowly indeed so we think of the rings as permanant.

in other words, smaller flames have a higher surface area to volume ratio, as do all small things compared to big things. Seems like a sensible assumption to me. while it's true that the flame and the air mix somewhat, they still have to do it through the "surface" of the flame.

http://www.sciencedirect.com has a whole load of open access journals. beware, though, that they tend to be the crappier journals if they're free.

I'm going to attempt this synthesis soon. I'm going to use pure paraffin oil and ammonia and oleic acid diluted from pure samples and the physics instructor has agreed to lend me the neodymium magnets. Other than what's written above, does anyone have any tips? Will I get spikes do you think? Does it have a shelf life or will the colloid remain stable indefinitely?

A formula is useless unless you define the terms.

here's a useful page from wikipedia. It lists all of the concentration measures you referred to

yes very true. there are a lotf of examples of this kind of thing but it doesnt apply to krypton

most likely you will get a mixture of chlorine and oxygen (and hydrogen at the other end), but i think chlorine would be the favoured product. I cant be sure, though since i have no idea what a baume is. what happened to moles per litre?

not as simple as you say it is.... Have a look at this link Start at element 36 and add electrons until you get to xenon (54) you'll see that indeed the 5s electrons get added first, but then one gets taken away again as you get to niobium (element 41) and then when you get to palladium (element 46), another electron si removed from 5s, leaving it empty. THEN it gets filled up again and the 5p block behaves itself properly. If you continue, you'll see that the f-block has all sorts of crazy twists and turns.

to be fair, though, the question is about the pressure of CO2 above the champagne, so it IS about a gas and one which is fairly close to ideal.

OK point taken. But Boyle's law doesnt apply.

I meant what I said. it's hard to pressurise a liquid, which makes speaking of its "pressure" usually pointless, since, as you so rightly said, it's most likely going to be the same as the atmospheric pressure or pressure above it. And yes, we need the Kc to be able to do this problem

are you given a Kp? or a vapor pressure for CO2? it's not the pressure of the wine you're after, but the pressure of the CO2 over the wine. at least that's what i expect. it's hard to pressurise liquids very much.

you can link to a picture on another website. Upload it to the website, take the link from there, press the button on THIS website which looks like a landscape (it's yellow), then enter the URL in the popup box. If your picture file isnt already uploaded and you dont know where to upload it to, try an image hosting website. I use imageshack.us

that's the opposite of what the electron configuration for krypton suggests I have to admit i don't know the answer to the original question I think most likely it either means that when the subshells are FULL, they exist in the order noted, and they only overlap when not entirely filled. OR it means that it's just customary to write the shells in their "logical" order (keeping all subshells of a shell together) when they're full, since their relative positions becomes less important.

so are you saying that in Krypton, the order of the subshells is altered, leaving us with the 3d and 4s the right way round, unlike the other elements?

phenyl cyanide, yes. I dont know about hydrogen cyanide. i dont think i'd even try. I think everyone could smell the phenyl cyanide. I used it in the fume cupboard but people would always complain about the smell anyway. There really is no such thing as "cyanide". the poisonous stuff you see in the movies is either hydrogen cyanide (if they breathe it) or sodium or potassium cyanide (if they eat it). There are hundreds more.

I never worked with hydrogen cyanide but i did work with phenyl cyanide and that stuff STINKS. I hated the smell of that stuff. And yes it's true, it smells like almonds

did you get the right value of x?

what are the phase symbols in your equation? pure liquids should be left out of the equilibrium expression. that should help you get x

I'm not really sure i understand your question For a given value of K, the amounts of products and reactants at equilibrium will always be the same, yes. If the equilibrium is changed, however, by addition of a product or a reactant, or by a change in temperature or pressure or volume, then the quantity of the reactants and products will change to partially offset the change, according to le chatelier's principle, and the direction indicated by a calculation of the reaction quotient.

your first step should have been to find the reaction quotient, Q. that would tell you which direction to expect a shift, which would in turn tell you if it was 1+x or 1-x

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