Chemistey Doubts

[xIshtar]

It's not breaking the rules xD.

 

[gary221]

It's not breaking the rules xD.

actually thts wht i thought but since im new around hre....

 

[MohammedNoor]

It's not breaking the rules xD.

actually thts wht i thought but since im new around hre....

new 181 posts ...................a

nice ok

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_1.pdf


in q 3 answer is A but it should be B as i think can anyone help me out



plz

Noor

 

[JmCullen]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w07_qp_1.pdf


in q 3 answer is A but it should be B as i think can anyone help me out



plz

Noor

it's B
how can the X be chromatography?
hahaha..

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w07_qp_1.pdf


in q 3 answer is A but it should be B as i think can anyone help me out



plz

Noor

it's B
how can the X be chromatography?
hahaha..

soo soorry by mistake took the mark scheme of may/june 2007

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w07_qp_1.pdf


in q 3 answer is A but it should be B as i think can anyone help me out



plz

Noor

it's B
how can the X be chromatography?
hahaha..

soo soorry by mistake took the mark scheme of may/june 2007

http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_1.pdf may june 2007 q 3 doubt help needed

 

[JmCullen]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w07_qp_1.pdf


in q 3 answer is A but it should be B as i think can anyone help me out



plz

Noor

it's B
how can the X be chromatography?
hahaha..

soo soorry by mistake took the mark scheme of may/june 2007

hahaha.. it's ok..
btw, seriously! good luck tomorrow!
im damn scare.. >_<

 

[MohammedNoor]

http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_1.pdf help me in this one Q3 plz

and i m scared too didnt study anything........................

 

[JmCullen]

http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_1.pdf may june 2007 q 3 doubt help needed

It's A
it's 5.5 degree celcius.
and the only temperature with 5.5 is A and D
and they said, lower than water boiling point. (b.p. of water is 100)
so it's A

 

[MohammedNoor]

thnx

 

[JmCullen]

thnx

okay~

 

[Unkownbunny]

http://www.xtremepapers.me/CIE/Cambridg ... 9_qp_1.pdf varient 2
Q6 and Q19. i didn't understand it because 03 and 02. shouldnt it be 0? how is it reduceD?

http://www.xtremepapers.me/CIE/Cambridg ... 8_qp_1.pdf
Q 30? where is carbon in the reactivity scale ?

http://www.xtremepapers.me/CIE/Cambridg ... 6_qp_1.pdf
Q 19. why not copper powder?

http://www.xtremepapers.me/CIE/Cambridg ... 3_qp_1.pdf
shouldn't MP be higher for covalent? why for the ionic bond?



Thanks in advance =) xxx

 

[JmCullen]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_s09_qp_1.pdf varient 2
Q6 and Q19. i didn't understand it because 03 and 02. shouldnt it be 0? how is it reduceD?

http://www.xtremepapers.me/CIE/Cambridg ... 8_qp_1.pdf
Q 30? where is carbon in the reactivity scale ?

http://www.xtremepapers.me/CIE/Cambridg ... 6_qp_1.pdf
Q 19. why not copper powder?

http://www.xtremepapers.me/CIE/Cambridg ... 3_qp_1.pdf
shouldn't MP be higher for covalent? why for the ionic bond?



Thanks in advance =) xxx

6) D, it's non-metal. so the electrons at the outer most shell will be 6 and 7

19) B. N2 and NO gain oxygen(oxidise). O3 lose 1 oxygen (reduce)

30) D. carbon is after aluminium before zinc

19) C. copper doesnt react with acid

err.. the paper in 2003 summer, which question are you talking about?

 

[Unkownbunny]

oh im so sorry i forgot to mention that. Q8 =)
and thanks for the answers I get it now xx

 

[JmCullen]

oh im so sorry i forgot to mention that. Q8 =)
and thanks for the answers I get it now xx

it's ok!
so, do you still need the Q8 answer and explanation?
anyway, i'll write it down.
cuz im going to bed. just incase u need..

ok..
Q8) it's A. SrCl2 is ionic compound. and so, it has high melting point. and ionic compound is soluble in water

good luck for tomorrow!!! :beer:

 

[moonlight22]

hey do I have to know how to calculate the limiting reagents ?

this is in the chemical reactions chapter

 

[JmCullen]

hey do I have to know how to calculate the limiting reagents ?

this is in the chemical reactions chapter

i think you need to know this for paper 3.
quite seldom they have limiting reagent question in paper 1.
but, to be secure, better you understand how to calculate it.

 

[gary221]

hey i got a doubt!!!


thnx!!

 

[JmCullen]

hey i got a doubt!!!


thnx!!

i think it's D..
coz potassium is high in reactivity.
and it is soluble.
barium sulphate is insoluble. so it can't dissolve in water.