Physics, Chemistry and Biology: Post your doubts here!

[shafayat]

Please Help
question num 8-b please some one tell how to draw and where please
question num- 11 b c and d
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w05_qp_3.pdf

8b is parallel plate n the direction is positive to neg !
11b connect DC current over the plates ( I hope u know wht plates I am talking about !)
then pput the source in a box with a slit and keep an counter in the oppside and move the counter and take readings
11 c away from the neg plate n toward the positive plate
11 d because beta has neg charge .... so moves away from neg terminal but towards pos terminal (plate)

 

[shafayat]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s11_qp_62.pdf

I HAVE THE PROBLEM WITH THE LAST QUESTION OF THE CHEMISTRY 2011 PAPER 6 PLEASE HELP

simple yar ! take equal amounts of both fuels one by one ! n take equal amounts of water in the beaker burn the fuel for equal time ! n record the temp change in water ! the one which has more temp change is better fuel

 

[MariamHASAN]

HOW TO BURN THE FUEL JUST BY DISSOLVING IN WATER N HEATING?

 

[shafayat]

n

I'm doing chemistry p3 .. and why are the markschemes so sensitive ? like there is this question that why is aluminium used in cables .. so it can also be bcz aluminium has a high melting point right ? but the markscheme dosent say that _O Why's that ??

o yaar bcuz aluminium is less dense

 

[shafayat]

HOW TO BURN THE FUEL JUST BY DISSOLVING IN WATER N HEATING?

LOOOOLLL noooo

take the fuel in the spirit burner
take water in the beaker !
put beaker on retort stand !! n put burner under it ... then do the steps I saide b4

 

[za Shadow]

guysssssss HELP !!!
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s11_qp_63.pdf

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s11_ms_63.pdf

Q 2 e) why in the mark scheme its written "fizzing/bubbles" from where did the bubbles and fizzing come???????

and more thing....

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s05_qp_6.pdf

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s05_ms_6.pdf

in june o5 p6 Q 5 e) the answer is Copper (II) ions present but how is that and the observation is GREEN solution then he said in the observation dark blue solution so in answer i wrote "contains iron 2+ ions and copper 2+ions......but the mark scheme said only "Copper (II) ions present" WHYYYYYYY????????????????????

PLZZZZZ HELP HELP

 

[Sam Ivashkov]

Hi. I've got a question in Chemistry ; Extraction of Aluminium.
Cryolite is added to Aluminium Oxide to reduce it's melting point, right? So what is the new melting point?

 

[shafayat]

guysssssss HELP !!!
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s11_qp_63.pdf

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s11_ms_63.pdf

Q 2 e) why in the mark scheme its written "fizzing/bubbles" from where did the bubbles and fizzing come???????

and more thing....

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s05_qp_6.pdf

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s05_ms_6.pdf

in june o5 p6 Q 5 e) the answer is Copper (II) ions present but how is that and the observation is GREEN solution then he said in the observation dark blue solution so in answer i wrote "contains iron 2+ ions and copper 2+ions......but the mark scheme said only "Copper (II) ions present" WHYYYYYYY????????????????????

PLZZZZZ HELP HELP

first one .. leave the fizzing thing ! write solid deposits (red-brown colour)
n colour change from blue to colourless
...

dude the thing is that when we added aq. amoonia it turned blue .. so what was present ... cu2+ only right ....

 

[justforinformation]

Hi. I've got a question in Chemistry ; Extraction of Aluminium.
Cryolite is added to Aluminium Oxide to reduce it's melting point, right? So what is the new melting point?

Not that we have it but I guess its around 1000 degree Centigrade.

 

[AhmedMans]

In Physics 0625, are we supposed to know how a GM tube works?

 

[azee11234]

hey guys, do we need study organic chemistry for paper 6 !! please answer asap!!

 

[za Shadow]

first one .. leave the fizzing thing ! write solid deposits (red-brown colour)
n colour change from blue to colourless
...

dude the thing is that when we added aq. amoonia it turned blue .. so what was present ... cu2+ only right ....

thanks

 

[AAnsarii]

no they tell u in the question... smooth curve is free hand but the thingis im not sure with the straight line graph thing. Gradient are almost never constant in chem.

Thanks a bunch!

 

[AAnsarii]

hey guys, do we need study organic chemistry for paper 6 !! please answer asap!!

i don't think so.. just found that max they asked (what i remember): organic fuel/hydrocarbon burned with a sooty flame.

 

[natsume hyuga]

i don't think so.. just found that max they asked (what i remember): organic fuel/hydrocarbon burned with a sooty flame.

what was the question for that?

 

[NIM]

guys any good tips fr chem practical 52...

 

[kainat husain]

please some one help tmw is my exam nd i need to knw please
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w08_qp_6.pdf
q4- f- why is the answer acid carbonate and CO2

 

[sma786]

thank you soo much dear but still i have some doubt! in question 1 (c) the height is 12 i think :/ thn 0.5*12*5...pls make it clear ;/
and alpha can go left and righ also right or only into the paper? and which hand rule will we have to use?

noo, is 10.5 or 10.6 something, look clearly
into the paper because its weak, beta goes left n right or smthng .. i dunno the rule =\

 

[sma786]

Anybody having good notes of polymerisation ?? i see all the p3's of chem have questions frm polymers =\

 

[Dashexdan]

please some one help tmw is my exam nd i need to knw please
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w08_qp_6.pdf
q4- f- why is the answer acid carbonate and CO2

becz effervecence only occurs with CO2 !