John Cuthber

If the solid dissolves in the liquid without undergoing any chemical reaction, why shall be there thermal energy? Because the forces holding the molecules together in the crystal are different from those that exist ins solution. Is the energy coming from the fact that drag acts as a resistance to the downward motion of the solid? No. As has already been pointed out several times, it has nothing to do with drag forces. Moreover will there be any Magnus effect? As has already been pointed out several times, it has nothing to do with drag forces.

I suggest that you give up and proceed with something else. Why do you think that dissolution is related to drag forces? I can make a mixture of hexane and tetrachloromethane that has the same density as water. By adding other materials I can fine-tune the viscosity as well The drag forces on a grain of salt will be the same in both water as in this mixture But the salt will dissolve in the water and yet it will not dissolve in the mixture.

It seems that tying mistletoe to your belt buckle is considered inappropriate. Merry Xmas everyone.

Two points. First: I did. Second: what you did was worse than useless. By cluttering up this thread with irrelevant dross about pH indicators and then with complaints and denials when it was pointed out that your stuff was useless, you have not merely failed to help the OP, but you have actively interfered with others' attempts to do so. How do you dare to call yourself "Teacher"? (That's a rhetorical question; please don't clutter the tread any further by answering it here. Do you understand that posting a knitting pattern would also have been the wrong thing to do?

The pointing a hosepipe at the moon is analogous to the observation, made many years ago, that the writing speed of the beam of an oscilloscope can exceed the speed of light. None of the electrons is faster than c, but the point where they hit the screen can do so. So what? It's not a real thing?

Lego has wheels? It must have moved on from my day.

I wonder who marked Hypervalent down for that post. It's difficult to think of a single test for anions (well- there's ion chromatography but I doubt that's what the OP asked for). The best I can come up with off hand is the addition of silver nitrate which gives different coloured ppt with three of the halogens (after the addition of dilute nitric acid to dissolve silver salts of weak acids. It also gives some interesting results with other ions; for example the ppt with sulphite turns black on boiling. But that's not characteristic, the same is true of formate and tartrate.

I'm going to drop a few hundred lego bricks on the floor then walk round barefoot; it will be less painful than this thread.

Well, yes, but nobody has suggested what the additional sink is, but we know that we are the additional source. Whatever was taking care of volcanic CO2 in Newton's days is still doing it now. Whatever was happening before: it had reached a dynamic equilibrium- until we disturbed it. But we are here. So the only way that volcanoes could dump 10 times as much CO2 would be if there were a sink for 10 times as much CO2 pulling the concentration down to 300 ppm (or whatever). And, unless there was an additional sink to make up for our additional source the concentration would go up. The point is that I don't know, or care, how much CO2 the volcanoes produce. That CO2 was already being mopped up somehow. We added some more, but we didn't add a corresponding sink- so we have raised the net concentration. Imagine that we lived on a world without vulcanism. There would still be forest fires and bacterial decay producing CO2. There would still be photosynthesis removing it from the air. And if we added more by burning fossil fuels then there would be more in the air.

"John Cuthber, OP asked question (if you didn't notice): "I was wondering what the test is for negative non-metal ions?"" I noticed. I also noticed that you didn't answer it. You told him how to check the concentration of H+ My post #3 was answering question "how to check whether there are some negative ions in solution", but without getting into details of their kind. And, as was pointed out by Rick, your suggestion just doesn't work. For example a solution of sodium chloride has plenty of negative ions in it, but barely affects any pH indicator Did you not realise that? " Stop nitpicking posts of people who try to answer (whether they are answering correctly or not). And concentrate on helping authors of threads. You have serious problem with this. Your post is absolute no help to the OP to this thread." I was helping the OP. I was explaining why following your suggestion was a waste of time. Perhaps you should "concentrate on helping authors of threads." by not replying to things with stuff that doesn't help them at all, but distracts from the issue. Even ammonia is listed on wikipedia as weak base in examples section https://en.wikipedia.../wiki/Weak_base Yes, it is. and nobody said otherwise. What I said was " "NH4OH" (so far as it exists) is a very strong base. It is essentially entirely dissociated in water." Do you not understand that there is a difference between NH3 and NH4OH Not least- one of them barely exists. As for "You can't be serious with this equation... To get NH4+ in the first place you had to have: NH4+ OH-" it's just not true. I can start with NH4Cl for example. I can dissolve it in water and the equilibrium I indicated earlier will be established NH4+ +H2O <----> NH3 + H3O+ So to some extent the solution will produce hydronium ions And, if you put a pH meter or indicator in there, you will find that the solution is, indeed, acid. But the big issue here is you saying " Stop nitpicking posts of people who try to answer (whether they are answering correctly or not)." It's not "nitpicking"- you were totally wrong, unhelpful and irrelevant. Not only that, but when this was pointed out you tried to argue that you were right. Why not accept that you get stuff wrong- it's not as if it's the first time is it?

So what? You can get a solution with pH near 9 with sulphite, carbonate, phosphate, borate and a stack of other ions. So a pH indicator is ( as was pointed out) useless. You get hydronium ions from ammonium ions: there's an equilibrium NH4+ +H2O <----> NH3 + H3O+ If you don't know that you probably shouldn't be posting an answer. It's pretty much irrelevant since the question is about anions, rather than cations. Also "NH4OH" (so far as it exists) is a very strong base. It is essentially entirely dissociated in water.

"My question is...it occurs to me that any operation on the guests moving from room to room will take an infinite amount of time therefore the result of any operation will never occur. ". Why would it take an infinite time? Each person just walks to the next room along. Why would that take more than a minute or so?

Does anyone know why Trump's opening lines of his first speech were lies?

Nope, In fact, up till recently the concentration of CO2 in air was about 300 ppm, and now it's near 400. If the volcanoes were pumping out ten times as much then, in order for us to have reached a pre-industrial equilibrium at 300 ppm , the plants would have to have been absorbing ten times more. And then we added some and it went up to 400. How it came to be 300 before (it could be a big source and a big sink, or a small source and a small sink) doesn't really matter. Obviously, if the turnover was bigger, it may well have been more difficult for us to perturb it- but it also might have been more sensitive. The fact is that we changed; the volcanoes didn't *; so we are responsible for the changed outcome. * if you can show that the volcanoes have changed then that's a valid argument, but I see no plausible mechanism or evidence.

An answer is to look for ATP. It doesn't last long in dead things, but it is always present in living things (as far as we know- I'm not speculating about space aliens here)

Anything asserted without evidence can be dismissed without evidence. Also "genetic" and " mental" are clearly not mutually exclusive, so your proposition makes no sense.

"Is there intelligent life here?" Yes, but I'm only visiting.

It wouldn't matter if it was. The number of volcanoes- and the CO2 released by them is pretty much stable, so their contribution to the CO2 in the air can't be responsible for the rise in CO2. And global warming is due to the rise in CO2. Also, we know how much CO2 humans produce because we know how much fossil fuel we burn- not least because we usually pay tax on it.

I think minus seven rep points with just one post is a record. However I haven't checked, so- for the moment- it's just an opinion.

According to that wiki page "The CPU time spent on finding these factors by a collection of parallel computers amounted approximately to the equivalent of almost 2000 years of computing on a single-core 2.2 GHz AMD Opteron-based computer" ​How much is the electricity bill for that There are easier ways to make money. Computer security doesn't need to make it impossible to hack in; it only has to make it pointless.?

That would stop it being a magnet; but it would still me magnetic.

Know anyone with two uteri?

Keeping the fermentation cool(ish) has several advantages. One is that you don't lose as much alcohol. Another is that you lose less of the volatiles. Most of the things that contribute to the flavour are less volatile than ethanol- but they are still volatile so they risk being lost. There's also the issue that if the fermentation gets too warm it will heat itself and you get a loss of process control- that's not good for flavour or product loss. I'm puzzled that a thread on whisky distillation includes this "Whisky is... distilled.. after fermentation..". It's not as if anyone was unaware of that, so why say it? "Whisky is... distilled.. after fermentation..

For a lot of people, getting the local authority to take the rubbish away will be free. At worst the charge is about £60 https://www.sheffield.gov.uk/environment/waste/bincollections/bulkycollections.html http://www3.halton.gov.uk/Pages/Bins/BulkyCollection.aspx https://exeter.gov.uk/bins-and-recycling/special-collections/enquire-about-a-bulky-waste-collection/charges-and-collection-days/ Some don't seem to charge at all http://www.leeds.gov.uk/residents/Pages/Book-an-unwanted-items-collection.aspx

Did you spot the critical phrase in the Telegraph article or the vital word in their headline? It's the bit that allows the courts to take account of those sorts of things. Perhaps it's elitist of me to expect you to read and understand it it. Another interesting question is why were they not taught some sort of critical thinking?