For a chem lab experiment... to compare published values with what we found the potassium value to be through experiment. For a 1st year general chemistry lab.
125431
I doubt that anyone would really be able to answer that unless he or she just so happened to work there.  I suggest calling or e-mailing someone from the aquarium.
158280
http://www.juliantrubin.com/fairprojects/chemistry/chemicalreactions.html\nhttp://www.scifair.org/\nhttp://physics.usc.edu/~gould/ScienceFairs/
391691
Next time, don't use the words "chem nerd".\n\nThat won't really encourage many positive reactions.
484989
It tells you when you're at the end point, and the end point is where ever you want it to be, hopefully past but not too far from the equivalence point. \n\nThis isn't always used for pH. Let's say you wanted to know the concentration Sodium in a Na2C2O4 solution. You could use standardized KMnO4 (which is purple) and do a redox reaction which would make CO2 and a bunch of cations (K, Mn, Na). This would be a redox titration, which is different from acid base. This redox titration is actually pretty interesting because a reagent is the indicator, so the end point is when the solution changes to the color of the reactant (this particular reaction is also self catalyzing, which is kinda neat as well).
372509
Need more info in order to help you...what class level?...what field of chem?...writing project or lab demo?...what is an 'investigatory project'?\nPlease resubmit your question anew with as much info as possible so that we can offer reasonable suggestions...if you simply edit this one we cannot reply twice to same question.
499794
If you are doing a lab report, then you must have done the lab.  State a question on what the lab was about.What did you do?
373780
in addition to the wikipedia page\nhttp://en.wikipedia.org/wiki/Potassium_chloride\n\nhere is some additional info\nhttp://www.ucc.ie/academic/chem/dolchem/html/comp/kcl.html\nhttp://www.answers.com/topic/potassium-chloride\nhttp://www.hastand.com/specs-potchl.html
224573
The weaker the acid, the stronger the conjugate base.  The stronger the acid, the weaker the conjugate base.\n\nBy "strong", we are refering to its ability to dissassociate in water and break into ions.\n\nIt might help if you convert all your pKa values to Ka, or all your Ka values to pKa to make it easier to compare.\nWhat does a high Ka value mean?  What does a low Ka value mean?  How does this compare to your definition of a "Strong" acid/base or a "strong" conjugate acid/conjugate base?
163952
Kp=Kc(RT)n\na.Kp=Kc(RT)-1/2\nb.Kp=KcRT\nc.Kp=KcRT\nd.Kp=Kc(RT)2
319335
1.) do your own homework\n2.) this is the computer forum, not high-school chemistry.  Next time post to the right furom.
364052
b. It reacts with water. All those properties are properties of potassium, but only b) is a chemical property, the other properties are physical properties.
496240
Potassium (chemical symbol K) has 19 each of protons and electrons, because it has an atomic number of 19.  Potassium has more than one naturally occuring isotope.  Potassium can have an atomic mass of 39, 40, or 41.  However, over 90% of naturally occuring Potassium is K-39, with 20 neutrons.  K-41, with 22 neutrons, is also stable.  K-40 has 21 neutrons, and does occur in nature, but with an abundance of only 0.012%.  In addition, it is not truly stable, although its half-life is over a billion years.
658292
There are several uses for this.  Generally for chemistry students the effort teaches them how the measurements are made, good laboratory techniques, and hopefully, some insight into chemistry and the physical sciences.  It doesn't always work, but it makes a good experiment. \n\nFor those who are in the business of using various substances, it is very important to know what their physical properties are, and how they relate to the physical properties of other substances.  Your air conditioner was designed around those measurements, as was your car, paint, furnace, and just about everything that was manufactured around you.  \n\nWhile nature obviously doesn't carefully record properties in a lab book, they are important to how plants and animals work, how hard rocks are, how ice forms, etc.  Without understanding these properties, we can't understand nature or ourselves completely.
530280
Usually in an activity like this you are given clues as to the chemical and physical properties of each element.  the properties are the same, but the names are different. Use the clues given and what you can find out about the properties of the different families of elements to complete the activity.
22824
OK. You've posted this (and several other) questions(with exactly the same words and numbers) for the fourth day in a row, and everytime you've asked, one person has responded and we've all got different answers. \n\nI can't tell if you're a student that's gonna keep posting until several people give you the same answer, of if you're just someone that likes making the nerdy people solve chem problems. If you're the latter, you should really find a better use for your time. \n\nIf you're the former, try working the problem yourself and then compare your answers to ours, or compare our approaches, your notes, and textbook and see where they differ. Our different answers can probably be attributed to some math or conversion error. \n\nRemember, when all else fails follow the units and you'll be right more times than not.
548258
You need a variable in any experiment to compare results. Perhaps you could use cold (ice) water in one container, warm in another and hot or boiling in another. You can then make your prediction on which will dissolve first and have an experiment that will verify whether you have made an accurate prediction.
436286
It dosent matter what it is about, Its it you can use the scientific method correctly. ask you teacher to help you. And don't be afraid to ask. P.S. I've won 2 science fairs 2nd and 3rd Prize.