hermanntrude

when you say "dry", though, you have to mean REALLY dry. I did this reaction the other day and was surprised to see, before I even got a drop of water into the flask to start the reaction, large crystals of sodium chloride were growing at a visible rate on the surface of the sodium.

perhaps if it's excess heat that does it, you could apply heat to certain areas using something like a branding iron? it might crack the substrate though, uneven heating... moved to inorganic chemistry

read up on formal charges. There are a few examples where the charge doesnt exactly lie on any particular atom. That's called delocalisation or resonance, so make sure you include those. If you have a textbook, it will be sure to have a section on these.

moved to homework help. what happens to the hydrogen peroxide? it...........

forget the paper. Use enormous quantities of elmer's glue. Make moulds in structural shapes and allow the glue to dry then reassemble. Should be easy if they let u have enough glue. They didn't specify how much...

it depends on the cell you're going to use. I'm not sure if there are any disadvantages to using too much potential, but if there isn't, then you wouldn't go wrong with a 6 or 9 volt battery.

paint it, or use a dye. perhaps a reducing agent?

I think you can probably buy silver nitrate in photography specialist stores, although i'm not sure Generally if you've got enough liquid to cover an object you've got enough to plate it. Your idea is clever, but bound for failure, i think. I'm not sure if the electroplating would be only on the non-oxidized area, but the sanding would probably remove both the plating AND the oxide. Feel free to try it, though, i've been known to be wrong and it'd be an excellent method if it worked. Having said all of that, silver wire is easy enough to buy and not that expensive. perhaps you can just make your jewelry from silver? My father has made jewelry most of his life from silver, gold and platinum wire. He uses all sorts of tools he invented himself for this purpose.

this serves as a very simple explanation but the truth is more complicated than this. The receptors don't relay much information at all themselves. let's say you have four receptors (there are actually thousands). the receptors are called A,B,C and D. Receptor A will respond to onions, cabbage and milk. receptor B will respond to onions, cream, and the smell of pine trees. receptor C will respond to the smell of onions, carrots, cabbage. receptor D will respond to onions, shallots, and the smell of mown grass. Think now about what happens when you smell an onion. Receptors A,B, C AND D, will all respond. Your brain receives these responses, and through training, knows that this is the smell of onions. Remember that you are NOT born with the knowledge that onions will give this response. you have to learn about smells. the same is true of artificial noses... you have to train them to recognise smells. So when you smell pine trees, receptor B will respond, but none of the others. When you smell cabbage, receptors A and C will respond. If you smelt a mixture of milk and cream, you might judge the respective amounts of each by comparing the strengths of responses from receptors A and B. This is the kind of thing which occurs in olfactory sensing, although it's FAR more complicated than that, because there are so many receptors and so many smells, many of which are the smell of multiple chemicals anyway. it's not really the individual receptors' response which tells us what it is we're smelling, but the pattern of responses and their respective strengths.

i'd say you probably can't make this at home. You'd need to get the acrylamide monomer first, which would be difficult.

I meant what answer do you get when you do it your way (when you get a different answer to the correct one)?

i dont reccomend the use of your calculator's built-in function until you're outside of exam situations. it's all very well to press a button and get an answer from the calculator, but you won't get full marks if you didn't include the workings in an exam.

what answer do you get, then? perhaps you didnt take into account the 5:1 dilution?

perhaps there are certain conditions under which the decomposition is favoured? a catalyst, for instance, or at low pressures or something?

The Henderson-Hasselbalch equation is for buffers, which this is not. What you need to do is construct an ICE table. Do you know how to do that? if you do, you should also know that the numbers (containing the algebraic "x") at the bottom row, can be arranged to give you an expression for Kb, which you already know. then you can solve that equation for "x", and get a value for the concentration of OH, from which you can calculate the pOH, from which you can get the pH. If you need any help with any of these stages, let me know what's missing and i'll see if I can assist you further

I wouldnt heat lithium. I'd use the same method as for sodium and chlorine: place a little sand at the bottom of a conical, with a stopper with a tube through it. Fill the flask with chlorine gas. Carefully add a small dollop of sodium to the sand, then drop a single drop of water down the tube, and stand well back.

diabetic ketoacidosis is basically acidosis from a specific cause. there are other things which can cause acidosis, other than a high concentration of ketones due to being a poorly-controlled diabetic. the symptoms are probably very similar for any cause, although i suppose it's possible that some of the symptoms of DKA are specific only to the ketones and not specifically to the acidity

smell is a very complex sense. It works as a cross-reactive sensor array, which means that many different kinds of sensors are present, and some of them respond to any given molecule, and others respond to other molecules. The point is that if you only had one sensor, you couldn't tell one molecule from another, or even reliably identify a single type of molecule, but the pattern of responses from the many different receptors is unique to each smell, including smells which arise from mixtures of substances Perhaps a bit of reading on cross-reactive-sensor-arrays would help you understand? THIS review is quite in-depth, but perhaps the introduction might enlighten you a little Also try googling "artificial nose"

tell me what the topic of your paper is and perhaps we'll have a suggestion. angew chem is fairly high in impact factor (above 10 i believe?), but i don't know much at all about nature chem... it doesnt have an impact factor yet because it hasnt been around long enough

let me know how it goes. How about lithium and bromine or chlorine? probably a bit boring?

if you need any first-hand details about acidosis, i can help. I've had it.

thanks for the info. I suppose that iodine being in the solid phase slows it down a bit. Plus I imagine sodium iodide is less stable than sodium chloride because of the difference in ionic radii I had already decided it probably wasn't worth trying potassium and bromine.

I've seen many demonstrations of the reaction of sodium with chlorine, and now that i've discovered I have 3 lbs of sodium in my lab and a lecture bottle of chlorine, I will be adding it to my repertoire of demonstrations. However, it occurred to me that we ALSO have bromine and potassium, and iodine, too, for that matter. How dodgy would that be? has anyone ever seen these reactions? has anyone ever tried them themselves? Does anyone have any advice other than "be REALLY careful"?

that's the one I had in mind. Peshwari... mmm the one bad thing about newfoundland is they dont have any decent indian restaurants