Paper 5 Tips !! :)

[Ash1994]

1 mol of Cu 2+ = 2 Faradays
63.5g = 2F
1g = 3000C
2F= 63.5 x 3000
F= 95 250 C/mol
Am i clear?

where did you get 1g=3000C from ?

 

[Soldier313]

are you guys doing mass of solid/ mass of solution x 100?

mass of solid/mass of water x 100

 

[iKhaled]

for question 1 d october november 2010 paper 51 how can i prepare 250cm^3 of 0.1M aqueous lead nitrate?
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w10_qp_51.pdf

you know what..i cant do the whole planning for this question arghhh..someone pls help

 

[Soldier313]

Soldier313 thank you SOSOMUCH that was such a great explanation!
I'll pray you get what you want out of these exams In Shaa Allah!!

- one last thing, how do I calculate the weak acids then???

Aww aameen inshaAllah <3 i pray the same for you sis
weak acids, you follow the procedure,
(volume x c x deltatheta ) / moles of water formed
for weak acids, i believe some sort of data must be given inorder fo you to calculate a value. This is as far as I know, unless someone's got another way

All the best!

 

[knowitall10]

where did you get 1g=3000C from ?

The data booklet

 

[knowitall10]

mass of solid/mass of water x 100

Is it the same thing? i forgot the year we were discussing

 

[Zari]

Is it the same thing? i forgot the year we were discussing

i guess M/J 09 Q2 a

 

[knowitall10]

i guess M/J 09 Q2 a

Oh yea, Jazaki Allah
umm, i uploaded a photo a few pages back Soldier313 u might wanna take a look at my table

 

[knowitall10]

Oh yea, Jazaki Allah
umm, i uploaded a photo a few pages back Soldier313 u might wanna take a look at my table

and u Zari

 

[biba]

anyone please help me with this:
in a few qs such as JUNE/11/52 it is clearly stated that we have to draw a LINE OF BEST FIT but in the mark scheme it is written that NO MARKS FOR A STRAIGHT LINE ! EXAMINER'S JUDGEMENT ON THE BEST-FIT CURVES !

 

[knowitall10]

anyone please help me with this:
in a few qs such as JUNE/11/52 it is clearly stated that we have to draw a LINE OF BEST FIT but in the mark scheme it is written that NO MARKS FOR A STRAIGHT LINE ! EXAMINER'S JUDGEMENT ON THE BEST-FIT CURVES !

So what do u learn? That when the questions says line of best fit, it can also be a curve of best fit no?

 

[leosco1995]

A line of best fit can also be a curve.

 

[biba]

So what do u learn? That when the questions says line of best fit, it can also be a curve of best fit no?

um but how do we decide?

 

[mahmuda akter]

can u please help me about oct/nov10/53 1(c)? what apparatus to use?

 

[iFuz]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w12_qp_53.pdf
Question 3 last 2 parts :|

 

[knowitall10]

B

um but how do we decide?

y the shape of the plotted points. Did u plot them? See how it goes.. it's s smooth curve

 

[knowitall10]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_53.pdf
Question 3 last 2 parts :|

i'm stuck too :/

 

[knowitall10]

i'm stuck too :/

for (e), calculate the % error.

 

[danyaljamil]

can anyone help with determining avogadros constant through experimentation please help

 

[iFuz]

i'm stuck too :/

Part d :|