Chemistry Paper 61

[natsume hyuga]

they clearly stated write only observations i dont think the word CO2 is an observation i said a colourless gas

its effervescence and turns limewater milky

 

[natsume hyuga]

displacement? exo? I wrote precipitation... lol is that correct?

cool yea preceipitation

 

[natsume hyuga]

i had one point out

is it abt the straight line graph? yea one point

 

[natsume hyuga]

wait dont we have to wait for 24 hrs?are we busted?

 

[aliasal]

its effervescence and turns limewater milky

i stated fully" Effervesence, colurless gas which turns lime water milky"

 

[Nawaf Dandachi]

its effervescence and turns limewater milky

Fizz/Bubles, turn limewater milky

 

[TheBaller23]

Double displacement. I'm pretty sure of it.

What the heck is double displacement.. NEVER i've seen an answer DOUBLE DISPLACEMENT through all the 8 years past papers i went through... its PRECIPITATION!!

 

[EpicLol]

For the first question heating the Fe(II)Sulphate, you get SO2, Fe(III)O and SO3(White gas)....I checked online and this seems correct

 

[TheBaller23]

What was solid W?
and what happened by boiling iron sulphate???

Ammonium Carbonate

 

[EpicLol]

I put displacement and I think displacement, precipitation, and exothermic are right....but Im not sure if its displacement or double displacement....

 

[Wasif`]

It was Easy, the last question answer was :-
1. Place each Corrosion inhibitor in 3 test tube of equal amount.
2. Take 3 steel nails and place them in 3 water bowl.
3. Place each inhibitor in bowl.
5. Leave it undisturbed for 3-4 days in presence of air.
6. After 4 days, Remove the rust which will be Flaky brown solid (FE2OH3.xH2O) and dry them and weigh each of them.
7. The one which has more weigh will be least effective corrosion inhibitor and one with lower weight will most effective corrosion inhibitor.

 

[Patum]

its effervescence and turns limewater milky

yeah I wrote, it was effervescence and has bubbles. then in the same three lines I also wrote below that ' turns limewater milky'

 

[Wasif`]

It was Easy, the last question answer was :-
1. Place each Corrosion inhibitor in 3 test tube of equal amount.
2. Take 3 steel nails and place them in 3 water bowl.
3. Place each inhibitor in bowl.
5. Leave it undisturbed for 3-4 days in presence of air.
6. After 4 days, Remove the rust which will be Flaky brown solid (FE2OH3.xH2O) and dry them and weigh each of them.
7. The one which has more weigh will be least effective corrosion inhibitor and one with lower weight will most effective corrosion inhibitor.

 

[EpicLol]

It was Easy, the last question answer was :-
1. Place each Corrosion inhibitor in 3 test tube of equal amount.
2. Take 3 steel nails and place them in 3 water bowl.
3. Place each inhibitor in bowl.
5. Leave it undisturbed for 3-4 days in presence of air.
6. After 4 days, Remove the rust which will be Flaky brown solid (FE2OH3.xH2O) and dry them and weigh each of them.
7. The one which has more weigh will be least effective corrosion inhibitor and one with lower weight will most effective corrosion inhibitor.

I think I lost 3 marks....coz I did not mention like measuring the weight of rust....I just said look at it and the one with the most rust is the least effective....I just said compare it with the control by looking

 

[Nawaf Dandachi]

It was Easy, the last question answer was :-
1. Place each Corrosion inhibitor in 3 test tube of equal amount.
2. Take 3 steel nails and place them in 3 water bowl.
3. Place each inhibitor in bowl.
5. Leave it undisturbed for 3-4 days in presence of air.
6. After 4 days, Remove the rust which will be Flaky brown solid (FE2OH3.xH2O) and dry them and weigh each of them.
7. The one which has more weigh will be least effective corrosion inhibitor and one with lower weight will most effective corrosion inhibitor.

Bro, where is the fareness of the steel nails? Haha and the volume of the inhibitor? and you dind't say weight each of the peices?​

 

[EpicLol]

usually there are like 10 or more points to get the 6 or 7 marks so hopefully I will have gotten like 4-5 of them

 

[svenas]

Bro, where is the fareness of the steel nails? Haha and the volume of the inhibitor? and you dind't say weight each of the peices?​

I answere same exactly as him.....I think it is correct

 

[svenas]

Bro, where is the fareness of the steel nails? Haha and the volume of the inhibitor? and you dind't say weight each of the peices?​

a similar question came up before check this:http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_ms_62.pdf

 

[Hamzeh S]

Guys Need Help i wrote to put the iron nails in a test tube seperatly and provide rusting condition water and oxygen add water to the tube containing the nails compare which one rusts and which one rusts faster :S i know it sucks but forgot about masses and so on so how many marks can i get for this ?

 

[svenas]

Guys Need Help i wrote to put the iron nails in a test tube seperatly and provide rusting condition water and oxygen add water to the tube containing the nails compare which one rusts and which one rusts faster :S i know it sucks but forgot about masses and so on so how many marks can i get for this ?

u will get marks and I don't thnk that mass is included.......plz check the post I posted of the similar question which came before see it!