Biology; Chemistry; Physics: Post your doubts here!

[malay]

Is this carbon dating thing in our syllabus??

 

[A star]

Is this carbon dating thing in our syllabus??

thts physcs

 

[malay]

thts physcs

hehe...ok

 

[A star]

http://www.xtremepapers.com/papers/...al O Level/Chemistry (5070)/5070_w03_qp_1.pdf. Q3 how?

 

[ayeshaK]

http://www.scribd.com/collections/3026541/GCE-O-Level-Chemistry-Pure
CHEMISTRY NOTES FOR QUICK REVISION

 

[ayeshaK]

http://www.xtremepapers.com/papers/...al O Level/Chemistry (5070)/5070_w03_qp_1.pdf. Q3 how?

Its Option B ?

 

[A star]

Its Option B ?

no A

 

[malay]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_w03_qp_1.pdf. Q3 how?

B... H2 is less dense than air and diffuses rapidly through the porous pot.the pressure increases and pushes water level at X down.

 

[ayeshaK]

no A

Irs in mark scheme ?

 

[malay]

no A

maybe coz of the air pressure on the open end of the tube

 

[ayeshaK]

no A

If its a then its supposed dat hydrogeen is less dense than air so it will diffuse inside and water level will fall !! And due to outside pressure and less hydrogen in pot it will return to normal !

 

[malay]

no A

link for the ms plzz

 

[khizer shahab]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s10_qp_11.pdf

q22 wid explanation !!

q23 also

 

[Spidey21]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s10_qp_11.pdf

q22 wid explanation !!

q23 also

first of all bro
Salam, where have u been and how did your paper go??
23 will be A i guess or B...
22 i did not get it!

 

[khizer shahab]

first of all bro
Salam, where have u been and how did your paper go??
23 will be A i guess or B...
22 i did not get it!

w salam i have been on xtreme but was not posting my doubts here much

same here 23 a or b for 22 didnt get it !

 

[khizer shahab]

first of all bro
Salam, where have u been and how did your paper go??
23 will be A i guess or B...
22 i did not get it!

q28??

 

[malay]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s10_qp_11.pdf

q22 wid explanation !!

q23 also

22-C as the oxide of X is a catalyst so from the periodic table its Mn
23-A i guess coz grp 1 metals have low densities

 

[bogus]

thats charcoal. we boil the titrated solution after adding charcoal and then filter it off

r u sure its ok

 

[malay]

q28??

28-D as all the others are base or alkalis
do tell da right ans...

 

[Rimsa]

r u sure its ok

i am sure about the method but dunt write it in titration cuz all ms include the repeating point