Chemistry P31

[Mohamed123456789]

water???
they said salt!
how do you know that's the right answer!

You will be adding a salt to water which means that some ions will be formed

 

[IGCSE O/L student]

I wrote there will be more electrons..but I don't think it ok

i'm not even sure of my answer.

 

[ahmed soliman]

hey do u know why when salt is added to water, rust occurs faster?

i wrote that this will increase
amount of oxygen

 

[MERIHAN]

The right answer is that the water will contain ions which speeds up the rusting process

i dont know !!! our teacher told us

 

[L-Girl]

we've got many answers here guys

 

[Mohamed123456789]

i dont know !!! our teacher told us

Probably it is also right

 

[L-Girl]

can someone check my answer?

 

[Mohamed123456789]

can someone check my answer?

Relax it is only a 1 mark worth question dont worry u will get an A* easily isA

 

[Alan Khaledi]

if you have brain you would know that B is losing electrons
anyways i am not continuing this argument there is more than enough reasons to believe B was correct answer

watch ur mouth dude!

 

[L-Girl]

Relax it is only a 1 mark worth question dont worry u will get an A* easily isA

inshallah

 

[bluefa1con]

watch ur mouth dude!

what part of my post was offending -_-
i replied in the same tone as i got his answer in

 

[mohammed yasser]

it is because salt is an impurity and rusting get speeded up because of impurity that is what our teacher told us

so is this is correct beacuse i wrote the same

 

[YaZmin]

paper was awesome ALHAMDULLAH!i was petrified at first but then things went really good ..alhmdullah

 

[xxxt]

in book it is mentioned rusting is a redox reaction
oxidation strictly happens on B
actually as B loses electron the ion dissolves and the mass of B decreases
rust settles on the A increasing its mass as its discharged

formula was Al2O3.2H2O

which varriant did u take? b/c i dont remember such a formula.

 

[L-Girl]

which varriant did u take? b/c i dont remember such a formula.

variant 1

 

[salvatore]

it is because salt is an impurity and rusting get speeded up because of impurity that is what our teacher told us

Salt acts as a catalyst & speeds up the rusting process!

 

[*MK*skydiver :D]

in book it is mentioned rusting is a redox reaction
oxidation strictly happens on B
actually as B loses electron the ion dissolves and the mass of B decreases
rust settles on the A increasing its mass as its discharged

formula was Al2O3.2H2O

it is B ..but rust doesnt settle on A ...havent u seen in the diagram ..the iron oxide powder was at the bottom of beaker ?
Anyways , its B !

And yup thts the formula i wrote

 

[Beedo]

I think it was medium-hard,there is many new ideas in this test
I am sure that I lost 9 marks till now and the number is increasing
I didn't have time to check my answers again .
What was the answer for question about the b.p for group 1 and the density for group 1
What about the question for water process after taking from river and the CaCo3 ,CaO question
the question about clorobutane can I write halogenation?
I got the idea of the question of the iron electrodes right but wrote a messy answer(I don't remember that I noticed letter at electrodes) hope I get 1 mark for it

 

[Mahmoud khairy]

i wrote the same .. i found ratio 1:1.5:1,, so i multiply it 2 to be 2:3:2................ it would be Fe2o3(h20)2 ,,,is r8

 

[Ophéa]

I think it was medium-hard,there is many new ideas in this test
I am sure that I lost 9 marks till now and the number is increasing
I didn't have time to check my answers again .
What was the answer for question about the b.p for group 1 and the density for group 1
What about the question for water process after taking from river and the CaCo3 ,CaO question
the question about clorobutane can I write halogenation?
I got the idea of the question of the iron electrodes right but wrote a messy answer(I don't remember that I noticed letter at electrodes) hope I get 1 mark for it

i also wrote halogenation it's even written in my book
about the question for group 1 it's density decreases down the group not sure about b.p though