It's used in physical chemistry a lot and I can't figure out what it means.
213428
"Over the last century, many scientists have discussed the collisional rate of an ion with a polarizable neutral. Langevin began the discussion in 1905 with work outlining the attractive potential between a point charge and a point-polarizable neutral. The result was an expression for the collisional rate constant, k, in terms of a few simple variables; e, the elementary charge, α, the polarizability of the neutral, and μ, the reduced mass of the ion-neutral pair."\n\nclassical Langevin rate: k = 2πe √(α/μ)
522063
In that context, it just means that an acid has been added to give a pH below 7.  Normally, in the context is given the acid to use and the pH of interest.  If not given, then the use of the solution may give you a clue.
425157
I would have to guess that it involves the neutralization reaction of more than 2 substances.\n\nJust a guess
421776
i think an ion makes up a molecule. i am taking physical science and i went over it a few weeks ago.
515451
I'm vaguely guessing here but it has something to do with the law of conservation in thermodynamics. Matter (or atoms) cannot be created or destroyed hence the number of atoms on the left hand side must equal the no. of atoms on the right hand side of the equation. Hope that helps!
361795
chemical and physical properties of elements depends on the group or period that it belongs to...i guess it's just easier to arrange the elements according to the atomic number, there's more common ground to sort out the elements that way. can't imagine what the table would look like otherwise...
144856
It is a chemical reaction.
249229
it means that the soap molecules mix with the water molecules loosening them up, that's why most soap foams when you get it wet
524497
The subscrips indicate that mulitples of the symbol they follow.  Like the AgNO3 the three means that there are 3 oxygens.  The two after the () means there are three whole molecule though, that can be placed infront as a coeffient.
437076
Its a very inert, extremely low density element which is low on the periodic table and gaseous at common atmospheric temperature and pressure. And when you breath it in it makes you talk funny. That last one is most important.
168320
it measures the hydrogen ions present\n\nusing the galvanic cell theroy (similar to battries)\nand also refers to amount of acid that a liquid can dissipate before becoming 'pure acid'
421066
'A Person' gives a short, simple, and correct answer. \n\nIt is simply when two atoms (ions [thus the name]) join to form a compound. One ion is + the other -.\n\nGet an "A".
485601
Entropy (S) is the measure of disorder in a system. When thinking of problems such as this, it's helpful to think of it in terms of a gas being the highest entropy state, a liquid being kind of in the middle, and then a solid being the lowest entropy state.  \nA) A gas goes to another gas.  There should be no change in S.\nB) S is negative.  A gas condenses to a solid. You are moving from a higher state of entropy to a lower state.\nC) Positive S value. You go from the lowest energy state (solid) to an aqueous solution (liquid), which means the entropy goes up as well.
176137
The naming of elements precedes the atomic theory of matter, although at the time it was not known which chemicals were elements and which compounds. When it was learned, existing names (e.g., gold, mercury, iron) were kept in most countries, and national differences emerged over the names of elements either for convenience, linguistic niceties, or nationalism. For example, the Germans use "Wasserstoff" for "hydrogen" and "Sauerstoff" for "oxygen," while some romance languages use "natrium" for "sodium" and "kalium" for "potassium," and the French prefer the obsolete but historic term "azote" for "nitrogen."\nThe current system of chemical notation was invented by Berzelius. In this typographical system chemical symbols are not used as mere abbreviations - though each consists of letters of the Latin alphabet - they are symbols intended to be used by peoples of all languages and alphabets. The first of these symbols were intended to be fully universal; since Latin was the common language of science at that time, they were abbreviations based on the Latin names of metals - Fe comes from Ferrum, Ag from Argentum. The symbols were not followed by a period (full stop) as abbreviations were. Later chemical elements were also assigned unique chemical symbols, based on the name of the element, but not necessarily in English. For example, sodium has the chemical symbol 'Na' after the Latin natrium. The same applies to "W" (wolfram) for tungsten, "Hg" (hydrargyrum) for mercury, "K" (kalium) for potassium, and "Sb" (stibium) for antimony.
356742
It means "native soda", "genes" or "forming"\nIt means same as in greek word too. =)
330253
I think that what is troubling you could be an exerecise involving "molarity" which uses two quantities: mass(moles)/volume(liter). \nBut you have to bear in mind that mass is referred to the solute, and volume refers to the solution. So, these quantities are not referring to ONE substance. \nIt would be better if you posted a question with the whole exercise, for clarity. \nGood luck.
525767
It means its giving off energy and or sub atomic particles.\n\nThere are 4 types..  Alpha, Beta, Gamma and Neutrons