albertlee

There is no ionisation for hydrogen....When an element combines with hydrogen , it is always covalent bonding.... I think FireDragon might mean that share one electron from hydrogen with Nitrogen, then it becomes paritially positive which attracts with lone pair of another NH3 but it does not sound quite right as a formation of a compound ion!!! It is just the intermolecular force that attract every molecule together, and thats all....Nothing much!!! Since NH3 is valent, there is no need to share with another single hydrogen........ So the main question is: How is there an extra hydrogen cobining with NH3 in any way that makes an ion with a complete positive charge? It is kind of complicated, compound ion is bonded with covalent bonding which produces either complete positive or negative charge that is combined with another ion in ionic bonding..... thx for furthur respond

5614, I know, but why the electron leaves?

but FireDragon, how can Nitrogen in this case take up four sigma bonds? It doesnot make sense... It is like you make up one ion like this H3O which has 1 negative charge.... By the way, what does "sigma" mean? Albert

aM, for compiling .java into .exe, Sun offers a compiler called JIT(Just-in-time) compiler, which compiles the code into native machine code....Go to java.com for more info.... Albert

YT, what does hydrogen bonding and ammonia has to do compund ions? I am not familar with hydrogen bonding, it somehow tells that the molecules have charges.....Never know of that, how can molecules have charges? my teacher tells me that compound is neutral for both ionic and molecular....... Any way, confuse... Again, before I go any deeper, I want to know what is the bonding of Nitrogen and Hygrogen in the form of NH4 ion.... Albert

but 5614, I already know much about ionic compounds.... but I want learn more about compound ions. Firstly, I would like to ask, for eg, the compound ions, NH4, what is the bonding between Nitrogen and Hydrogen in this ion? Albert

In my chemistry, it has listed several compound ions, but it does not explain how they are formed and how their charges are found........ For eg, NH4 with 1 positive charge OH with 1 negative charge SO4 with 2 negative charges HCO3 with 1 negative charge and so on..... How compund ions are formed, and how their charges are found? according to the formula? Maybe possible, tell me what kind of property does the formation of compund ions have thx in advance Albert

look up here: http://www.bbc.co.uk/science/humanbody/mind/articles/personalityandindividuality/whatamilike/mastermind.shtml MASTERMIND is the least common personality in UK.... Test you A level guys what personality you are

I have a question about static IP ADSL.... If I plug cable into the router, how can I assign the static IP address? since I want to share this IP address though NAT for more than one computer to access Internet...

When we have Dynamic IP for ADSL or Cable, Does the ADSL ISP provide a kind of software that needs to be executed in order to connect to the Internet and obtain an IP address? And for Cable, why it does not need a software for obtaining IP? I got cable Internet connection and it is on all the time that I thoght I have a fixed IP..... Apreciate for furthur responds

Thx,, so is Florine in this case bonded as molecules?

thx YT, for last questioning, Do you mean Calcium in the form of carbonate is Calcium Carbonate as well as Magnesium in the form of Hydoxide is Magnesium Hydroxide?

To YT2095, for the example ions in tap water like iron, Calcium, magnesium , and etc... Since they are ions, what are they combined with? give me few examples? Secondly, where do those ions get mixed up with the tap water? Albert

When I am doing the experiment, mostly when dissolving something, My teacher requires us to use de-ionized water, why? what is de-ionized water? and Why just not use tap water?

I have seen about the info of world top 10 unversities, and most of them were from USA and some of them from UK...... I am just wondering, Lets say , if you study maths, ComSci, PHysics, or Medicine, etc, What is the general "difference" on the purpose of their study in Science between UK and US universities?

thx Glider, so what are plasma proteins used for? Albert

The masterpiece among all the sci-fic I have read is the Time Machine.... I forgot the name of the author, but all his sci-fic turn the science into an unbelievable, ingenius , and imaginary extent....

To Glider, I ask how do the sodium ions and plasma proteins affect the gradient, not water........ any way, what I really want to know is: what are sodium ions and plasma proteins in Biology? what roles do they play? Albert

ok, not a specific bio term,... just means "control",,,, need to improve my English... thx you very much , 5614 Albert

Well JHAQ, what i mean is the scientific uncertainty which means there is a range when you take the measuring, which the true value will be in it...... for eg, when you say you weigh 75 kg, but it will not be just exactly 75kg, and there is a scale depending on how accurate your balance is, so I will say it is: 74kg < your mass < 76kg and there is a limit of accuracy... Since there is rarely anything in science that we can say exactly true value on measuring, we are just trying to be as accurate as possible. For JHAQ's post, there is only few choices for the mathematical uncertainty, for eg, the binomial equation, (a-1)(a+1) = 0, then a shall be either -1 or 1, and therefore there is only 2 possbilities.. Any more comment?

thx 5614, now I know what does it mean by water potential, it is a tendency that water move from a higher concentration to lower concentration..... but for the last thing, what does it mean by "regulate"? it does not explain in ur site... Albert

to 5614, it is not blood, but plant... any way, maybe "potential" means "concentration"? so water potential means water concentration? Albert

"Blood solutes affect the water potential of the blood, and thus the water potential gradient between the blood and the tissue fluid. The size of this water potential gradient is largely due to sodium ions and plasma proteins. The blood solute level regulates the movement of water between blood and tissues." Above is the description from my bio book. What does it mean by: 1. Water potential 2. tissue fluid, is it plasma? What do the sodium ions and plasma proteins affect the gradient? Does the whole description mean that the water moves by osmosis to balance the concentration between tissue and blood solute? does "regulate" mean "move"? Albert

Ok, so the most cases dealing with uncertainty are in the situation where the numbers come from the measuring, right? Albert