Post Chemistry doubts here!

[fishcook]

any chem doubts?

 

[Mariam Mohamed SX132]

do u have any useful notes?

 

[fishcook]

not softcopies. sorry /:
check extremepaper revision notes.. they are helpful

 

[thats_me]

any chem doubts?

What is Van da waals force? and wats the diff in galvanising and sacrificial protection? :S

 

[BumbleBEA]

What is Van der Waals force? and what's the difference between galvanizing and sacrificial protection? :S

Galvanizing by definition is covering a metal with another metal which does not corrode, or at least, corrodes less. Galvanizing iron generally refers to coating it with zinc because it is more corrosion-resistant than iron (despite being a more active metal) because its oxide, ZnO, adheres to the surface of the metal.

Sacrificial protection involves protecting the iron with a sacrificial anode made of a more active metal such as magnesium, which will oxidize instead of the iron. The iron will not be oxidized because the iron ions (cations, specifically.) will be reduced by the more active metal anode. When the sacrificial anode is depleted, the iron will start to corrode.

 

[fishcook]

van der woals forces of attraction is the weak attraction between the layers of the 3 strong covalent bonds in graphite. these delocalized electron are able to carry a charge.
galvanizing is electroplating the object with usually zinc, but scarificial protection doesnt involve the iron/steel to be plated only the more reactive one should be in contact with iron, so sacrificial protection it doesnt involve electricity

 

[thats_me]

Galvanizing by definition is covering a metal with another metal which does not corrode, or at least, corrodes less. Galvanizing iron generally refers to coating it with zinc because it is more corrosion-resistant than iron (despite being a more active metal) because its oxide, ZnO, adheres to the surface of the metal.

Sacrificial protection involves protecting the iron with a sacrificial anode made of a more active metal such as magnesium, which will oxidize instead of the iron. The iron will not be oxidized because the iron ions (cations, specifically.) will be reduced by the more active metal anode. When the sacrificial anode is depleted, the iron will start to corrode.

van der woals forces of attraction is the weak attraction between the layers of the 3 strong covalent bonds in graphite. these delocalized electron are able to carry a charge.
galvanizing is electroplating the object with usually zinc, but scarificial protection doesnt involve the iron/steel to be plated only the more reactive one should be in contact with iron, so sacrificial protection it doesnt involve electricity

thx a lot
fishcook can u explain vander waal in general?

 

[fishcook]

Np
its basically just the name given to the force between the layers of graphite. as each carbon atom is bonded with 3 strong covalent bonds in a 2-d hexagonal layer and in between these layers is one weak carbon covalent bond and electron are able to move. this space between the two layer is called vander woals forces of attraction

 

[thats_me]

Np
its basically just the name given to the force between the layers of graphite. as each carbon atom is bonded with 3 strong covalent bonds in a 2-d hexagonal layer and in between these layers is one weak carbon covalent bond and electron are able to move. this space between the two layer is called vander woals forces of attraction

ohhkayee got it Thankss once again

 

[ammar.danish1]

Oyaa Man how can we prepare for ALKANES AND ALKENES ?? how i dont know what to do ? how can we guess boiling point ?? of alkane

 

[fishcook]

you dont need to know the boiling points for hydrocarbons.

 

[ammar.danish1]

And temme oders questions answer ?

 

[Kirabo Takirambudde]

Please answer this question

THnaks!!

 

[haidi]

what topices i need to study for paper 6

 

[Afzal1]

just concentrate more on titration reaction, the test of anions and cations on ammonia and sodium hydroxide, rate of reaction.
and separation tecniques this will be enough for A*

 

[Afzal1]

what topices i need to study for paper 6

check this out it might help

 

[Shepard97]

Nice notes

 

[Afzal1]

Nice notes

im glad u liked them....... btw dont forget to LIKE my post

 

[Shepard97]

im glad u liked them....... btw dont forget to LIKE my post

Yes