Chemistry Oct/Nov P4 2012

[Muniba Suhail]

question 10 marks ka tha ? :/

lol, he was replying to 'nerdz'. The guy who started this discussion
Read the first post

 

[ahmadumar]

lol, he was replying to 'nerdz'. The guy who started this discussion
Read the first post

lmao

 

[KyleoAhsan]

For the titration question here are the answers ^_^!
1. 1.61g
2. Pink to Colourless
3. Average volume = 25.6
4. 25.6/1000 x 0.1 = 0.00256 moles
5. 1 mole --> 1 mol so 0.00256 --> 0.00256
6. 25.0cm^3 --> 0.00256 / 250cm^3 --> 0.0256
7. 50/1000 x 1.0 = 0.05moles
8. 0.05 - 0.0256 = 0.0244
9. 1 mole --> 2 mole / 0.0244 mol --> 0.0122
10. 1.61g/0.0122 = 131.96 == 132g
11. 90 + 12x+y = 132
12x + y = 42
x = 3 y = 6
I haven't been to xtremepapers for sometime so wasn't able to update it ! :3! Hope you find it all useful now !

 

[Nerdz]

We're graded out of 60, and then its divided by 2. So you lost around 5 marks.

well, thats some good news! I really need an A in Chemistry!

 

[aneeq247]

i
isn't paper 4's weightage 25% ?

Oh I wasnt talking about that, I was talking about the overall marks of the paper. The paper is out of 60, but we are graded out of 30.