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Ocr gateway CHEM 4 5 6 markscheme

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Original post by haithamnhaque
I just read the titration page and you are supposed to use the point of neutralization. That means it is not 0.16


I did0.1 x (20/1000) = 0.002 moles for HCl

then 0.002/(25/1000) = 0.08mol/dm3
If I get an A in this paper, but have an A* in coursework and previous paper, will I get an A* overall?
Original post by OllieBiggs
If I get an A in this paper, but have an A* in coursework and previous paper, will I get an A* overall?


No because this paper is worth more than the other paper

Paper 1 ums
A* = 126
Paper 2 ums
A* = 144
Coursework ums
A* = 90

To get an A* overall you need 360 ums points
(edited 7 years ago)
Original post by happiness12
What was the answer to the question where it asked what mass would be produced with 20.6 amps instead of 10.3 for 120 minutes ???
i got 60 g


It was scale factor 4 so i just did 7.6 *4
Original post by mxskaan
For the C4 6 marker it was copper chloride for compund A and compound B was iron (II) bromide.

For the C5 6 marker I got 0.08mol/dm3 of NaOH.

For C6 I got Fe + CuSO4 --> FeSO4 + Cu. Fe oxidised. Cu reduced.
I think It asked for the word equation

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I think It asked for the word equation
Original post by happiness12
No because this paper is worth more than the other paper


Ok thanks
Original post by OllieBiggs
If I get an A in this paper, but have an A* in coursework and previous paper, will I get an A* overall?


Yes you will because ca is 25% paper 1 is 35% so that is over 50% of your mark a*

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Original post by happiness12
What was the answer to the question where it asked what mass would be produced with 20.6 amps instead of 10.3 for 120 minutes ???
i got 60 g


Yesss:biggrin:

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Original post by haithamnhaque
I think It asked for the word equation


It asked for both.

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Original post by mxskaan
It asked for both.

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Ohhh ok I didn't add the balanced
What about the question about ozone - it asked how reaction 1 was split and to talk about electrons and bonds?

I said the covalent bonds break evenly so they both had a pair of electrons. The electrons are unpaired which makes them very reactive free radicals
Original post by happiness12
What about the question about ozone - it asked how reaction 1 was split and to talk about electrons and bonds?

I said the covalent bonds break evenly so they both had a pair of electrons. The electrons are unpaired which makes them very reactive free radicals


I said something similar to this :smile:

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Original post by moppp
If I put 0.08 dm^3 would I still get marks because I didn't put mol/dm^3?


Most likely yes but it depends on the examiner :smile:

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Original post by happiness12
What about the question about ozone - it asked how reaction 1 was split and to talk about electrons and bonds?

I said the covalent bonds break evenly so they both had a pair of electrons. The electrons are unpaired which makes them very reactive free radicals


Correct
Im putting marks in so refresh
Guys was the amount of pesticides in country E actually 1.26 billion?
Original post by JickDee
Guys was the amount of pesticides in country E actually 1.26 billion?
yes
Original post by ellamoon_22
yes


But didnt it say that only 18% of the land was agricultural land in the table?
So you had to multiply 1.26 billion by 0.18 to get the actual amount?
Original post by JickDee
But didnt it say that only 18% of the land was agricultural land in the table?
So you had to multiply 1.26 billion by 0.18 to get the actual amount?


The 18% wasn't included in calculation i didn't use it I can't actually remind question
What is the boundaries for A* my grade all together I've worked out (pper 1,2 and coursework) is 81.75% of the total 400
(edited 7 years ago)

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