Reactions

[Primarygun]

Today, I learnt about the reaction and did a displacement.

Mainly the displacement reaction,

A+Compound with metal C-----> C + Compound with A

Where A is more reactive than C and it displaces it.

What if A is less reactive than C? I found that some reaction still undergo where most of the reaction.

I found that magnesium displaces iron(II) sulphate very fast.

The reaction involve a large amount of heat released and even steam was produced. Why?

Last, do the non-metals displace similarly? And is hydrogen more reactive than potassium to displace metals?

[YT2095]

in reverse order, Hydrogen is less likely to stay in play when presented with potassium metal or (Ion if not already tightly bound).

think about Acids, it`s a substance with a replaceable Hydrogen Ion, H2SO4 think of the H in that, add some K metal and BOOM! you`ll get potassium sulphate, lots of Hydrogen from the H I asked you to remember.

now in the case of rhe Mg and ferric sulphate, the Iron actas a bit like Hydrogen, Iron metal isn`t all that reactive either, but Magnesium is! ok, Mg metal isn`t as reactive as Potassium sure, but it`s still up there with the big boys

 

and so, the Iron Sulphate may as well be an Acid in comparison, making magnesium sulphate and Iron metal for a while until it becomes a Hydroxide, it is a VERY exothermic reaction, consider it similar to WET thermite reaction, using Hydrogen as the mover instead of Oxygen

[jdurg]

Plus, if the temperature is elevated enough, the steam will react with the magnesium and generate even more hydrogen.

[Primarygun]

Is the reactivity directly depended on the electronegativity ?

[YT2095]

Yes

[Primarygun]

How about the bonding strength in a particular molecule?

such as potassium fluoride, stronger or less stronger than francium chloride?

[YT2095]

well I have no data on Francium, so I`ll use Cs instead if that`s ok?

 

using Paulings scale of electronegativity to determine percentage of Ionic Charecter.

 

Cs = 0.7 and Cl= 3.0 a difference of 2.3

 

K = 0.8 and F = 4.0 a difference of 3.2

 

as a percentage 2.3 = 74%

and 3.2 = 92%

I`de infere from that KF has a stronger bond than CsCl.

 

I could be wrong, I`m very tired today. Zzzzzz...

[Gilded]

"I could be wrong, I`m very tired today. Zzzzzz..."

 

I'm tired all the time! However, I seem to be wrong about 90% of the time.

 

Funny you mention francium chloride. I wonder if it's ever been made. Hey, that brings up a question I've been wondering about for a while: What happens to a bond if the element it's bonded to decays? For example, in the case of uranium oxide. I bet it depends on the type of decay, though. Any info about this?

[YT2095]

if it loses Neutrons in the dacay, it`ll simply pass that Oxide onto the new element it becomes after the decay

 

in a billion or so years it`ll become Lead Oxide eventualy (dependant on the dacay type).

[pulkit]

well I have no data on Francium' date=' so I`ll use Cs instead if that`s ok?

 

using Paulings scale of electronegativity to determine percentage of Ionic Charecter.

 

Cs = 0.7 and Cl= 3.0 a difference of 2.3

 

K = 0.8 and F = 4.0 a difference of 3.2

 

as a percentage 2.3 = 74%

and 3.2 = 92%

I`de infere from that KF has a stronger bond than CsCl.

 

I could be wrong, I`m very tired today. Zzzzzz...[/quote']

 

 

A factor that governs stability of compounds is the size of ions, by size I mean relative size. Two ions comparable in size would be more stable in a bond than one big and a small ion. That is why if you take NaCl and mix it with KF, you expect to get KCl and NaF.

 

As far as CsCl goes, I don't think you can simply look at difference in electronegativities and comment on its bond strength - its more of a rough estimate (especially since it will also depend on which scale of electronegativity you chose to use)

[YT2095]

the Pauling scale as far as I`m aware takes this into account, that`s why I used it

[budullewraagh]

That is why if you take NaCl and mix it with KF, you expect to get KCl and NaF.

i wouldnt be so sure, as the absolute value of the reduction potential for natrium is less than that of kallium

[Primarygun]

A factor that governs stability of compounds is the size of ions, by size I mean relative size. Two ions comparable in size would be more stable in a bond than one big and a small ion. That is why if you take NaCl and mix it with KF, you expect to get KCl and NaF.F.

Is it the deep meaning of a more reactive displace a less reactive?