ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

[kumiko]

ok what do u have so i can add u

Inbox me is okay

 

[princessanum]

Chemistry, May June 2004..
Q.29
How do we solve this question?
How to reAAAD that gas syringe >_>

1/5th i.e 20% of oxygen is present in the air and for nitrogen 4/5th i.e 70% approximately.....so
1/5*starting volume of the sample of air=final volume of air
1/5*x=30
x=30*5
x=150 cm^3

Hope u got it

 

[princessanum]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s08_qp_1.pdf

Question 19. The answer is D but I don't know why...

 

[kumiko]

These are doubts I got for chemistry paper 1:
1) May94 Q10
2) May 99 Q17
3) May 2000 Q39

I know it's a abit too much, but I am really grateful to people who help me to solve these problems

 

[princessanum]

Chemistry ..
November 2007 , paper1 , Q 35

 

[Zoya khalid]

In electrolysis , does molten salt gives gas for example lead(2)bromide?

 

[Skynox]

In electrolysis , does molten salt gives gas for example lead(2)bromide?

Yes at the anode bromine is produced..

 

[Rania MD]

Could any of you help me with this question. (chemistry)
The correct answer is C but why cannot it be A?
year november 1999
Thanks

 

[Besterlinks]

Could any of you help me with this question. (chemistry)
The correct answer is C but why cannot it be A?
year november 1999
Thanks

Cuz for potassium, its reaction with HCl will be like... too reactive... explosive (in formal terms, it will not be 'suitable' as a method of salt preparation). The other two options will work fine.

 

[Alool]

I want to solve a paper and whichever paper i open i find that i have already solved it...what will i do now..any suggestions?

 

[Rania MD]

Cuz for potassium, its reaction with HCl will be like... too reactive... explosive (in formal terms, it will not be 'suitable' as a method of salt preparation). The other two options will work fine.

ohh yea because it's a group one element. Thanks ( :

 

[svenas]

Assalam-o-alaikum wr wb...
you guys started studying chemistry?
we, well I didn't even give the bio exam yet

Hiiiiiiiiiiiii........hw r u? hw was ur paper...for me it was rlly awsme...that's offcourse due to ur help...
now lets switch to chemistry...I've question in 1995 nov q 29 ...confused between B and C

 

[zaid1q]

Plz plz help Q 31 http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w11_qp_11.pdf

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Hiiiiiiiiiiiii........hw r u? hw was ur paper...for me it was rlly awsme...that's offcourse due to ur help...
now lets switch to chemistry...I've question in 1995 nov q 29 ...confused between B and C

I am fine Alhamdulillah..wbu?
paper was awesome Alhamdulillah..i am glad..and it's all Allah's mercy on us!
sure..gimme some time..i have nothing saved on my laptop so lemme open the links sorry!

 

[HamzaZAz]

OCT/NOV 2009 Q 4 , 10 ,20 can anyone please explain this to me

 

[Zoya khalid]

OCT/NOV 2009 Q 4 , 10 ,20 can anyone please explain this to me

4 is c because when it forms postive ion it means that it has lost an electron!

answer for 10 is c again because it says in the question For each atom of carbon present in a molecule is equal to number of atoms of oxygen but
the hydrogen atom are twice.

for 20th u have to study the test
barium nitrate is added to check for sulphate ion
and for chloride its aq silver nitrate

 

[HamzaZAz]

4 is c because when it forms postive ion it means that it has lost an electron!

answer for 10 is c again because it says in the question For each atom of carbon present in a molecule is equal to number of atoms of oxygen but
the hydrogen atom are twice.

for 20th u have to study the test
barium nitrate is added to check for sulphate ion
and for chloride its aq silver nitrate

thanks

 

[Zoya khalid]

thanks

np

 

[svenas]

I am fine Alhamdulillah..wbu?
paper was awesome Alhamdulillah..i am glad..and it's all Allah's mercy on us!
sure..gimme some time..i have nothing saved on my laptop so lemme open the links sorry!

do u want me to post the question paper?

 

[Yomna ElHabiby]

View attachment 12784

Thank You