Iota

I don't think I can give an answer of any real value with my level of chemistry knowledge, but this is more for my own interest: how about adding sodium bicarbonate? Use up the strong acid and replace it with a weak acid, carbonic acid. It's in powdered form, so there's no problem concerning water. Assuming the carbonic acid created is too weak to react with your desired product, and creates no by-products which will become a hindrance with what your doing. Nope my mistake, I missed a huge problem with that, it makes water. I was thinking of it as a buffer reaction for some reason.

I think you should follow up your idea on page 2, use magnets, it works when done properly! Place a tinfoil hat on your head and attach a magnet to a string and spin it round your head in circular motions. After about an hour you should feel high. Don't let anyone see your magnets though, they're classed as drug paraphernalia. If anyone sees your tinfoil hat and asks what it's for, don't say to get high... that will just sound crazy, just say it's to stop them reading your mind. They'll understand man.

It says you can rent it for just $3.99... then maybe uhumm, prt scrn, ctrl + v.

Yeah I'd say that's probably right. The large surface area definitely plays a big part in the energy build up and lots of heat release. The cotton probably doesn't react at all, the super-glue merely adheres to it, as it does to anything else, which is an exothermic process.

The adhesive action of super-glue releases heat when it forms bonds to the material, causing smoke. Don't know what exactly happens on a chemical level. I was wiping up super-glue that I'd spilt on my desk, using toilet paper, it got so hot that I burnt my hand, dropped it, then it started to smoke.

Tissue paper + super-glue = heat and smoke. It gets very hot so you might be able to achieve fire. Word of warning: avoid breathing in the fumes, they're harmful.

If we say a heart attack is the point at which a person begins to experience chest pain, approximately how long the heart muscles is denied oxygen might that be? For the sake of theory, let's assume the artery isn't blocked gradually; it was open, then it's closed.

I can work out these equations when the pressure and volumes are given, but I've forgotten how to do it with those that only state depth: A scuba diver inhales air at a depth of 10m and ascends to 1m, holding their breath. If their normal lung volume is 0.500dm3, to what will this expand during the ascent? I've been looking at it a while and can't work it out. The pressure decreases and volume increases as they ascend, but I don't know how to work out the factor by which the volume increases.

http://www.telegraph.co.uk/technology/news/9902223/Facebook-Google-and-Amazon-join-fight-against-cancer.html To help scientists analyse masses of data which would otherwise take years to go through, a 'game' is being made that civilians can use on their smartphones to contribute help.

Going to throw my laptop out of the window soon. Don't think it will help though. Little things are tripping me up, and I can't get answers for them anywhere I search. I have a standard deviation value, I have a graph with a point plotted. How to I add an error bar to this? I mean, the SD value is 0.9. Do I draw the bar going 0.9 above and 0.9 below the point? Or do I have the point in the middle of that error margin, and the error bar going 0.45 above and below my point on the graph? I hope it's the latter of the two, or else I have to draw this graph for the 100th time because it's not big enough for these error bars.

I'll go do that, thanks for your help.

I was thinking it would possibly be this: log rate= log k' + b log([A])

Thanks, I need to improve my maths skills, a point in the right direction is always good. Right, would it simply be this: log rate= log k' + log [A]a I'm unsure what to do with [A]a, if anything at all.

Is it where: a to the power of x = b? Otherwise I'm afraid I do not.

I've worked out a rate equation: rate=k'[A]a the nice and easy bit. Now I have to take the logs of both sides of the equation. The thing I'm confused about is that I have no values, it just wants me to show the equation with the logs of both sides taken, so would that literally be shown just as: ln rate= ln k'[A]a ? I'm not sure how to do that or if the answer would be as basic as writing log next to both sides?

I've double checked the maths then checked it again, should be all right! Thanks.

I'm trying to determine the (theoretical) end-point for a titration of paracetamol with KOH. So I need to work out the volume of 0.1M KOH required to neutralise 125mg of paracetamol. Information about the practical this is based on: This 125mg of paracetamol tablet is crushed and dissolved in 100cm3, then 25cm3 of this solution is pipetted into a beaker. Titrate this with 0.1M KOH and find the end point. I have a method of doing this but I'm not sure it's correct: 0.125g/ 151.09gmol-1 = 8.27*10-4 mol paracetamol in 100cm3 solution. 8.27*10-4 mol/ 4 = 2.07*10-4 mol paracetamol in 25cm3 solution (the 25cm3 pipetted into a beaker). We are told that the conc. of KOH is 0.1M. With the information available here I said: 0.1M/1000*(x) = 2.07*10-4 mol I rearranged the above to find 'x', which is the volume of solution required to make the same amount of moles that there are of paracetamol, hence enough to neutralise it: (1000*(2.07*10-4))/0.1 = x = 2.7cm3 of KOH required. Is this remotely correct? If not can someone help me out? Thanks in advance.

Species is singular and plural form, there's no such thing as "specie" in that sense. Not very on topic, but regarding your topic heading, how is it possible for a new species to emerge by means of "massive murder"?

Not quite sure what you mean... maybe start with some A level textbooks?

For you to say this you must have ignored all of the points made above or not understood them... or you have a very good counter argument?

I don't know, myself. But you might consider downloading 'Accelrys Draw', it's a free chemistry tool on which you can draw a molecule, then have it generate IUPAC names, MMRs etc. Takes a while to get used to using but it's very useful, we use it at university.

I stopped the video at 1:21 when you made a comparison between our 'genetic capacity' to have depression and our genetic capacity to have wings. Not really equivalents are they? Your best bet is to take up bungee jumping or sky diving, something close to flying, because you'll never have wings. Gliding is the closest you'll get to having them.

Very true. Also now that most people are on Facebook, it seems to be even more important to be able to use proper spelling, grammar and punctuation... so that you're not seen as being stupid- as if being literate in your own native language proves you're intelligent.

Especially ridiculous seeing as maths is the most useful and all round usable tool in real life... but it's not seen that way by many people in schools because its importance isn't made clear enough. There's a whole topic about this in these forums and I agree with the view that it's being taught poorly, or at least it is in lowly achieving state schools. Science also seems to be viewed as the subject only for the high performing students, which obviously is not the case, anyone can do it. I remember my economics teacher mocking the sciences and science teachers at my school, while exaggerating the complexity of his own subject which mainly consisted of drawing the same supply and demand diagrams every single lesson to explain the oversimplified and completely conflicting models of how an economy works.

Ah I see. Having been educated even with basic scientific knowledge, on things like the causes of heart disease, obesity etc. can equip people with the knowledge to live healthier lives. That too goes for the dangers of smoking, alcohol and so on. It can make people aware of things such as global warming and pollution, the importance of recycling. It eradicates all kinds of dangerous superstition, such as claims that mental illness is caused by demons, as opposed to treatable mental health problems. It keeps radical beliefs at a minimum... no longer is stoning people to death for 'choosing to be gay' or drowning people for 'being a witch' widely accepted by most people, because we've been educated out of superstition, thanks to science. Just as a few examples.