Chemistry paper 12 discussion!!!!!!!!!!

[moonlight22]

chemistry is my favourite subject

 

[Gunner1995]

The overhead cable IS aluminium. But i wrote copper as the Elesctrode. I think its wrong but as it SADI SCHOOL it cant be platinum. They wont be able to use it. And copper doesnt reach with HCL.
HEAT ISNT NEEDED FOR STEAL. They said IRON from BLAST furnace which is already hot so no heat. I checked with my teacher, I wrote statement 2 doesnt explain which is B. And only zinc Dissolves which is D. I think 1 or 2 mistakes maximum.

 

[Outofideaz]

i wrote the same answers ..
wat abt the nitrate, sulphate and chloride question??

 

[Gunner1995]

Nitrate OFCOURSE. Only nitrate dissolves all of the,

 

[Outofideaz]

oh darn it ... lost one mark

 

[xIshtar]

Nitrate OFCOURSE. Only nitrate dissolves all of the,

Yey, I only made 2 mistakes

 

[moonlight22]

noooo but didn`t they mention barium and silver ??
barium --->sul;fate
silver --->chloride
...?

 

[Gunner1995]

Its not analysis bro. You need the solubility table.
And yes Barium PRODUCES a precipitate in sulfate. And silver + chloride produce. Its to do with solubility

 

[WayneRooney10]

i wrote the same answers ..
wat abt the nitrate, sulphate and chloride question??

Its D. Chloride, Nitrate, or Sulfate.
As, it may have silver sulfate, and barium nitrate. U get what I mean?

 

[WayneRooney10]

btw, what did you guys get for the green house effect questioN? :/

 

[xIshtar]

i wrote the same answers ..
wat abt the nitrate, sulphate and chloride question??

Its D. Chloride, Nitrate, or Sulfate.
As, it may have silver sulfate, and barium nitrate. U get what I mean?

It's B, as my teacher confirmed this with me..


The green house one was P, Q and the other one, which had methane or CO2, I think I put C.

 

[brainiac]

hey xlshtar wat was the green house question i cant remember properly ................

 

[yousef0074]

but hot and pressurized oxygen is blown into the furnace so heat would be needed

 

[soccerprinc3]

what about the one for monotomic?? its unreactive right??

 

[yousef0074]

yes, also heat is needed to keep the iron molten

 

[soccerprinc3]

oh ok, yeah i kept heat, oxygen and no calcium xD i feel so stupid!

 

[Gunner1995]

Heat isnt required. Google it. They said IRON FROM A BLAST FURNACE. i checked in my book. it says only CaO and O2 are needed. In an oxygen chamber, its already hot, and its an exothermic reaction, giving it heat would mean its endothermic wouldnt it, Wait the exam is over. Lets focus on paper 3 and leave the forum. What will it benefit us if we discuss it any longer.

 

[gary221]

Heat isnt required. Google it. They said IRON FROM A BLAST FURNACE. i checked in my book. it says only CaO and O2 are needed. In an oxygen chamber, its already hot, and its an exothermic reaction, giving it heat would mean its endothermic wouldnt it, Wait the exam is over. Lets focus on paper 3 and leave the forum. What will it benefit us if we discuss it any longer.

so wht was the ans to tht???
i did c which is wrong anyway!!!

 

[gary221]

Even i wrote copper and platinum

even i did!!

wht was the ans to that barium and silver ions???
i did D

 

[gary221]

What did the constituent mean? in that petroleum question?? I wasnt sure so i think i checked methane :S

do u mean the main constituent of natural gas????
i think i did methane too!!