Biology; Chemistry; Physics: Post your doubts here!

[Uchiha-Sasuke]

So here's a weird thing I found out today hydrogen shows purple colour on universal indicator :O
check question 5
http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_s12_qp_42.pdf
ms
http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_s12_ms_42.pdf

AND now my question which has been ignored since morning -_- PLEASE someone explain this to me
http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_s11_qp_42.pdf
why wont powdered form increase rate of reation in Q ?

 

[Faizan Muhammmad]

-__- OK I GOT IT
Check google my version of ionic equation is correct
however it asked for :Write the ionic equation for the reaction between a carbonate and an acid.
which is the one in ms
funky appa hamein daray na karein

 

[funky brat]

So here's a weird thing I found out today hydrogen shows purple colour on universal indicator :O
check question 5
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s12_qp_42.pdf
ms
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s12_ms_42.pdf

AND now my question which has been ignored since morning -_- PLEASE someone explain this to me
http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_s11_qp_42.pdf
why wont powdered form increase rate of reation in Q ?

For the last question, which question and part?

 

[Faizan Muhammmad]

So here's a weird thing I found out today hydrogen shows purple colour on universal indicator :O
check question 5
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s12_qp_42.pdf
ms
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s12_ms_42.pdf

AND now my question which has been ignored since morning -_- PLEASE someone explain this to me
http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_s11_qp_42.pdf
why wont powdered form increase rate of reation in Q ?

apparently they are giving preference to the fact that P is more concenterated

 

[funky brat]

-__- OK I GOT IT
Check google my version of ionic equation is correct
however it asked for :Write the ionic equation for the reaction between a carbonate and an acid.
which is the one in ms
funky appa hamein daray na karein

Did I not ask for the same thing? -.-

 

[asadalam]

So here's a weird thing I found out today hydrogen shows purple colour on universal indicator :O
check question 5
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s12_qp_42.pdf
ms
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s12_ms_42.pdf

AND now my question which has been ignored since morning -_- PLEASE someone explain this to me
http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_s11_qp_42.pdf
why wont powdered form increase rate of reation in Q ?

I believe that would be a mistake in the ms.As er states most students got the Q right and obviously H+ ions turn u.i red.

 

[Faizan Muhammmad]

Did I not ask for the same thing? -.-

you ASSUMED the carbonate of Calcium that was the problem
if you ASSUME a soluble one you will get the ms answer

 

[Awesome12]

y

ou have to intersect the 2 lines.. just dont extend them to the axes

W

So here's a weird thing I found out today hydrogen shows purple colour on universal indicator :O
check question 5
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s12_qp_42.pdf
ms
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s12_ms_42.pdf

AND now my question which has been ignored since morning -_- PLEASE someone explain this to me
http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_s11_qp_42.pdf
why wont powdered form increase rate of reation in Q ?

about your last question, well the answer is
If we increase the volume, the rate of reaction will decrease, but it will have no effect on the amount of products. if we increase the conc, the rate of reaction ill increase and so will the amount of products formed
Qs volume is increased and its conc. is decreased, which will slower rate of reaction. Catalyst will only increase it
P has lower vol. and high conc, which will increase rate of reaction. Catalyst will have little effect

Since Q has more conc. the line will continue up (more products formed)

 

[funky brat]

you ASSUMED the carbonate of Calcium that was the problem
if you ASSUME a soluble one you will get the ms answer

http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_w13_qp_41.pdf
Question number 9 ki pehli line jaldi se parhen zara. -.-

 

[Faizan Muhammmad]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w13_qp_41.pdf
Question number 9 ki pehli line jaldi se parhen zara. -.-

still doesnt make a difference
the part is clear and independent

 

[funky brat]

still doesnt make a difference
the part is clear and independent

Not independent or at least they should make it clear or whatever.

 

[funky brat]

I believe that would be a mistake in the ms.As er states most students got the Q right and obviously H+ ions turn u.i red.

There's no mistake in the mark scheme. Calcim hydroxide is an alkali, where does H ions come from. The OH ions make the solution alkaline so according to the spectrum of colours, it is purple.

 

[Faizan Muhammmad]

Iron sulfate is yellow
yah mujhay khawab anna hai paper main

 

[asadalam]

There's no mistake in the mark scheme. Calcim hydroxide is an alkali, where does H ions come from. The OH ions make the solution alkaline so according to the spectrum of colours, it is purple.

Ohhhh,i thought it said the gas was tested with u.i,sorry.

 

[asadalam]

Iron sulfate is yellow
yah mujhay khawab anna hai paper main

Seriously,hamain ilham hona hai,zindagi mai kabhi experiment kia nai aur sawal aese pooch rae hotay hain jesey hum sab ya mendeleev k ustad hain

 

[funky brat]

Iron sulfate is yellow
yah mujhay khawab anna hai paper main

Yeh konsay paper kar rahy ho?
Meray paper, main to nahi aya. :/
I hope the invigilator in my row knows Chemistry.

 

[Faizan Muhammmad]

Seriously,hamain ilham hona hai,zindagi mai kabhi experiment kia nai aur sawal aese pooch rae hotay hain jesey hum sab ya mendeleev k ustad hain

what do we do

 

[funky brat]

what do we do

Tukka lagao musalmano.
All we can do is pray to God kay aisa kuch na ae aur agar ae to bas sahi likh den kisi tarah.

 

[Faizan Muhammmad]

Yeh konsay paper kar rahy ho?
Meray paper, main to nahi aya. :/
I hope the invigilator in my row knows Chemistry.

s11 qp 42 question 8d

 

[Faizan Muhammmad]

Tukka lagao musalmano.
All we can do is pray to God kay aisa kuch na ae aur agar ae to bas sahi likh den kisi tarah.

main bhai ratnay jaraha hoon sarey colour
bohut hogya