Chemistry doubts..ask here!

[haochen]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_6.pdf
Q.2 (c) ?

as narutogirl said chloride is solible while hydrogen is insoluble
so it need time for it to evolve

 

[Unkownbunny]

Nervous xD!!!!!

 

[narutogirl]

so again something kokeeto said
47) If water contained salt, this will have no effect on rusting, however if a bigger substance is being rusted, it will be slower.
didn't someone ask this here and i answered that salt will help the inoization of water so speeding up the rusting...so am i or kokeeto wrong and plz explain

 

[lavanyamane]

Can you guys please tell me the colour changes of various indicators?
Methyl orange - acid, base, neutral?
Phenolphthalein - acid, base, neutral?
Any others?

 

[narutogirl]

Can you guys please tell me the colour changes of various indicators?
Methyl orange - acid, base, neutral?
Phenolphthalein - acid, base, neutral?
Any others?

methyl orange acidic: red
neutralrange
alkaline:yellow

phenolphthalein
acidic: colourless
neutral : colourless
alkalineink/purple

litmus paper
acidic:red
neutral:violet
alkaline:blue

that is wat is in my notes but i somehow feel they r kinda wrong :/

 

[haochen]

so again something kokeeto said
47) If water contained salt, this will have no effect on rusting, however if a bigger substance is being rusted, it will be slower.
didn't someone ask this here and i answered that salt will help the inoization of water so speeding up the rusting...so am i or kokeeto wrong and plz explain

rusting require 2 factor
1) water
2) oxygen
if one is present its ok , itll rust but slow

2 fator can increase the rate of rusting:
1) salt
2) acid

kokeeto was wrong

hope u got it

 

[haochen]

and the indicator is all right

 

[narutogirl]

so again something kokeeto said
47) If water contained salt, this will have no effect on rusting, however if a bigger substance is being rusted, it will be slower.
didn't someone ask this here and i answered that salt will help the inoization of water so speeding up the rusting...so am i or kokeeto wrong and plz explain

rusting require 2 factor
1) water
2) oxygen
if one is present its ok , itll rust but slow

2 fator can increase the rate of rusting:
1) salt
2) acid

kokeeto was wrong

hope u got it

thnx, that made it clearer

 

[AStarHunter]

guyz, in chromotography, do we have to specify the solvent ?!

 

[shan5674]

guyz, in chromotography, do we have to specify the solvent ?!

Yupp, if they ask you to describe it like draw it and stuff then yea you have to specify the solvent

 

[narutogirl]

guyz, in chromotography, do we have to specify the solvent ?!

no, did someone tell you that or did u read it in the mark scheme?
i just say use a suitable solvent

 

[AStarHunter]

so again something kokeeto said
47) If water contained salt, this will have no effect on rusting, however if a bigger substance is being rusted, it will be slower.
didn't someone ask this here and i answered that salt will help the inoization of water so speeding up the rusting...so am i or kokeeto wrong and plz explain

rusting require 2 factor
1) water
2) oxygen
if one is present its ok , itll rust but slow

2 fator can increase the rate of rusting:
1) salt
2) acid

kokeeto was wrong

hope u got it

what u said makes sense but in this paper ---> http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_6.pdf --- Q2(c)(ii) the mark scheme says no effect
I am confused

 

[AStarHunter]

guyz, in chromotography, do we have to specify the solvent ?!

no, did someone tell you that or did u read it in the mark scheme?
i just say use a suitable solvent

No i was just wondering cause everyone seemed to ask for the solvents in chromotography
Btw,I also say use a "suitable solvent" so i don`t know whether we should specify or not.

 

[narutogirl]

so again something kokeeto said
47) If water contained salt, this will have no effect on rusting, however if a bigger substance is being rusted, it will be slower.
didn't someone ask this here and i answered that salt will help the inoization of water so speeding up the rusting...so am i or kokeeto wrong and plz explain

rusting require 2 factor
1) water
2) oxygen
if one is present its ok , itll rust but slow

2 fator can increase the rate of rusting:
1) salt
2) acid

kokeeto was wrong

hope u got it

what u said makes sense but in this paper ---> http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_6.pdf --- Q2(c)(ii) the mark scheme says no effect
I am confused

oh that..well look the water would rise so that means the salt is left behind so it has no effect on the rusting..only if the nail or iron stuff is submerged

 

[Maleeha]

could any1 tel me full equation for rusting of iron?? its urgent..

 

[haochen]

so again something kokeeto said
47) If water contained salt, this will have no effect on rusting, however if a bigger substance is being rusted, it will be slower.
didn't someone ask this here and i answered that salt will help the inoization of water so speeding up the rusting...so am i or kokeeto wrong and plz explain

rusting require 2 factor
1) water
2) oxygen
if one is present its ok , itll rust but slow

2 fator can increase the rate of rusting:
1) salt
2) acid

kokeeto was wrong

hope u got it

what u said makes sense but in this paper ---> http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_6.pdf --- Q2(c)(ii) the mark scheme says no effect
I am confused

yeah but the water with salt didnt touch the nail as narutogirl said
so nothing will happen

 

[AStarHunter]

thanks a lot haochen and narutogirl

 

[Maleeha]

and if pH of ammonia is given 11, does it mean it is weakly alkaline????

 

[haochen]

could any1 tel me full equation for rusting of iron?? its urgent..

Fe2O3.xH2O

hope u got it

 

[haochen]

thanks a lot haochen and narutogirl

ur welcm

and if pH of ammonia is given 11, does it mean it is weakly alkaline????

no 11 12 13 14 are consider as strong
1 2 3 are consider as strong acid
4 5 6 are consider as weak acid
7 is neutral
8 9 10 are consider as weak acid

hope u got it