Chemistry P31

[somaya]

We jst had to write how SO2 and NO/NO2 are formed and how they combine with water to form sulphorus and nitrous acid and fall to earth as acid rain...

i jus rote abt sulfur dioxide

 

[L-Girl]

80+60+40=180 so 2 get A* may be u need to get 155-178 ! good luck . may be i can get an A

155-178 out of 180 or 200?

 

[reya]

out of 180 not 200

 

[bluefa1con]

As usual you are wrong the correct answer is electrode A

B was losing electrons
loss of electrons= oxidation

 

[bluefa1con]

what was the ionic equation in #2 , was it Ag+ + Cl- ------>AgCl , or somthn else ? plz tell me the ionic eqn ! :$

yes

 

[L-Girl]

out of 180 not 200

are you kidding :O u mean i need to lose 2 marks ONLY IN THE 3 PAPERS :O

 

[bluefa1con]

it may b da direction if current

this is not physics
they mentioned on the paper that it was flow of electrons

 

[Saadiya Ahmed]

i jus rote abt sulfur dioxide

It should b right...i dunno! :/

 

[BurakBurak]

B was losing electrons
loss of electrons= oxidation

There was rusting a was losing electrons Fe is changes into Fe+2

 

[shalala]

It should b right...i dunno! :/

this is not physics
they mentioned on the paper that it was flow of electrons

are you kidding :O u mean i need to lose 2 marks ONLY IN THE 3 PAPERS :O

which reaction was exothermic??

 

[thats_me]

yes

was it AgCl or AgCl2????

 

[L-Girl]

which reaction was exothermic??

condensation

 

[EpicLol]

I would prbly be like 155/180 or so....coz paper 6 was considererd hard...

 

[thats_me]

which reaction was exothermic??

i guess condensation

 

[reya]

are you kidding :O u mean i need to lose 2 marks ONLY IN THE 3 PAPERS :O

no no if u lose only 2 marks u r genius ! to get A* may be u need to get 150 coz last it was 140 or 139

 

[L-Girl]

was it AgCl or AgCl2????

AgCl

 

[bluefa1con]

There was rusting a was losing electrons Fe is changes into Fe+2

keep banging your head
A was losing electrons and B was supplying it
so the net loss was from B
much like sacrificial protection
B was being oxidized .
there is no point arguing
read the thread
people are backing up B because it was right

 

[L-Girl]

no no if u lose only 2 marks u r genius ! to get A* may be u need to get 150 coz last it was 140 or 139

but that was out of 200 not 180

 

[reya]

i guess condensation

i wrote the same but confused

 

[thats_me]

AgCl

YAY!