XtremePapers

sorry! i gave you the wrong explanation. if an equation has a reactant that is oxidised, the other will definitely be reduced. if one is present, the other is present too.

thank u...

did u understand?

yea sure!! thanks!

plz don't thank me. just pray for me. i want 8A*s

surely I'll pray for u....
inshalla u will get 8 A*s

Aameen!
you too!!

HELLO!
I was checking my physics paper 3 and the question which says energy conversion to other form I wrote a car accelerating..is it acceptable...in my book it's written like this....a car accelerating-----chemical to kinetic and heat...?

Hi!
i really don't know, but I wrote the change and then mentioned the change in brackets.

I wrote the chane is chemical to kinetic (and heat)..not sure if i wrote heat...so is there problem if it converts to more than one form of energy??

no, i don't think it's a problem. insha allah, it won't be a problem.

Helloo!!
plz help me with this:http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w05_qp_1.pdf
q35...
Thanks

when they say "unsaturated", it means there is a double-bond between carbon atoms. so, B is the answer.

yea ryt thank u..I was confused between c but realised that also dey said hydrocarbon so only h and O...BTW thanks..
other question is this:http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w06_qp_1.pdf
q11....anode I understood but cathode how come naoh???

all the positive ions move towards the cathode, here sodium is more reactive, so it remains in the solution, so sodium hydroxide is formed at the cathode.

but why hydrogen not formed?
or it's formed and escape??

both are formed. but since you are sure chlorine is formed at the anode, you have no other choice.

Got one more question: http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_w07_qp_1.pdf
q11...really hard plz explain it to me in detail..thanksss!!!!

i think u forgot the oxygen atom in the hydrocarbon. i faced the same prob. use that oxygen atom too.

yea but still not confident in this question .......maybe the hardest one I faced really!!!
BTW thanks aloot for replying!