Primarygun

Are oxides of metal soluble in water?

I would guess they have reacted with something to form a heavier substance.

The attractive forces between particles

Why does aluminium so readily form an oxide layer on its surface compared with other metals? What does Iron(II , III) means? Fe3O4 II= FeO III=Fe2O3 I recognised that it is the sum of the two oxides, but shouldn't it be the mean of the two oxides? Also, is the reaction of potassium reaction a displacement reaction?

The sodium atoms nearby

Thank you very much. The information helps me a lot. I wonder when it will be taught. It seems to be very useful. Oh. By the way, could air resistance slow down a falling object? And what happens if the atmosphere is made of homogenous air layer( every area of the atmosphere has the same number of gas molecules)?

I was implying something. Sorry to make you confused

Yeah. Rock missed the unit.

What's the relation between the speed of a falling object and the air resistance? Why does the resistance increase with speed? Is that similar to liquid? When a heavy thing is thrown into water, it sinks with decreasing speed, right? But if an object falls down from a mountain, it falls with increasing velocity but decreasing acceleration. Why there is a difference between liquid and gases? Aren't both of them fluid? Could anyone help me?

He joked us:P I think it embarrassing to ask him again.

I just learnt about the factors of production

Is the graph of the function inverted? Reflected in x or y axis or both?

Solubility depends on the attractive forces between solute molecules and solvent molecules --A that of solvent molecules--B and that of solute molecule and solvent molecule--C. A must be larger than B and C, otherwise, the solute is non-soluble in that solvent. For metal, maybe it's because metals are composed of atoms, which is neutral and the situation is like a simple molecular structure put in water. Secondly,maybe the C is larger than A.

What will happen if no one intended to report the case?

Heehh... I just wanted to know what my foreign American teacher wanted to teach us.

They carry 1 - charge. The attractive forces from the nucleus is not strong enough to hold the outermost shell electrons tightly. Vibration of electron, collision of electrons and the foreign attractive force which attracts the electrons cause the outermost shell electrons leave their original shell, hence, they are said to be delocalized.

http://en.wikipedia.org/ For this encyclopedia web site, a guest can edit the pages or even remove them. I am afraid someone who's very naughty and he will get rid of the pages. Is there anything I don't know?

It should be temporary and not stable. It sometimes becomes more strong and sometimes it becomes nil. It depends on the movement of the electrons. That's what I think.

I am quite afraid of the virus:P

1,2 are true. It is relative. If ions do not attract water, how do water attract them? The attraction between the ions and molecules must be greater than the attraction bewteen ions and that of molecules, otherwise the small attraction cannot overcome the attractive forces and hence it is insoluble. Non-polar molecules are always slightly insoluble in water.

It is a foul language. p-en-da or m-en-da. Gun-do. I really want to know the meanings of the two words above.

I think the reason of their outermost shell electron being delocalized is that atoms vibrate and their electron shell intersects, this cause the unbalanced attraction to the outermost shell electron.

I greatly appreciate your try.

Is the vibration of sodium atom the reason?

Anyone knows spanish? I learn a new word from my teacher. It is like " p-a-da" or "m-a-da". I think it looks like this.What does it mean?