CHEM AND BIO HELP AND TIPS HERE

[$H00t!N& $t@r]

i have another question...p1 chem 2006 m/j  q19

[guMnam]

i have another question...p1 chem 2006 m/j  q19

lol i was just doing it wen i read ur post...

[guMnam]

lol i was just doing it wen i read ur post...

and i m confused too....i think it should beA...but ans is c ??

[$H00t!N& $t@r]

lol i wrote A aswell!  so do  u guys know why the ans is c???

[Baladya]

Hey guys can u help me plz

I have two questions here: http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2006%20Nov/0620_w06_qp_1.pdf

Q)27 and 31, plz explain

And 1 question here: http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Nov/0620_w07_qp_1.pdf

Q) 11

Thanks in advance

[guMnam]

lol i wrote A aswell!  so do  u guys know why the ans is c???

i m not sure..for me it doesnt really make sense

[Baladya]

lol i wrote A aswell!  so do  u guys know why the ans is c???

Look, Bariu Chloride is UNSOLUBLE in water, so the method for removing these stuff is filtration. However Barium Sulphate is SOLUBLE in water, so when u are going to filter it it will just pass and not stay as residue. This is why u should straightly crystallize it

[$H00t!N& $t@r]

Look, Bariu Chloride is UNSOLUBLE in water, so the method for removing these stuff is filtration. However Barium Sulphate is SOLUBLE in water, so when u are going to filter it it will just pass and not stay as residue. This is why u should straightly crystallize it

i think u read the wrong question... i asked abt m/j 2006 q19

[guMnam]

i think u read the wrong question... i asked abt m/j 2006 q19

hahahahah..hahahah which world is he in lol..

[Baladya]

i think u read the wrong question... i asked abt m/j 2006 q19

hehehe xD
Anyway WTF First of all it should be D, m sure of this its written in my book. How come its C 0.o


By the way can u guys help me with y questions above

[Vin]

i think u read the wrong question... i asked abt m/j 2006 q19

which sub ?? chem bio

[Baladya]

which sub ?? chem bio

O sh*t lol i fail again I think they are talkin about bio
By the way Vin help plsss 

[soraam]

its easily C because copper is bellow H in reactivity series but when it in a compound it becomes reactive and  able to displace H
and the question says Cu+2 ion wich means it displaced the H and became CuSO4
clear ??

[dnal]

i cant understand ACIDS,BASES AND SALTS chapter and i am really facing difficulties with it!

if anyone have some goood notes...pls let me know!!

[Vin]

Hey guys can u help me plz

I have two questions here: http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2006%20Nov/0620_w06_qp_1.pdf

Q)27 and 31, plz explain

And 1 question here: http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Nov/0620_w07_qp_1.pdf

Q) 11

Thanks in advance

Q27  easy .. B
Carbon is more reactive than copper therefore it'll displace Cu to from CO2 and is less reactive and will result in no change

Q31 easy .. B
nitrogen oxides .. nitrogen and oxygen are "taken" from the atmosphere rest others are naturally in fuels


2007 Nov

Q11 start start balancing 8 oxygen from A .. always complete combustion of hydro-carbon fuel s give CO2 and H2O .. incomplete give CO and H2O

C5H11OH  +  8O2  ---> CO2  + H2O
impossible to balance oxygen!!

C6H9OH  +  8O2 ---> cO2 + H2O
try to balance !!

after balancing ..
C6H9OH  +  8O2 ---> 6CO2 + 5H2O

ans is B