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# Ocr gateway CHEM 4 5 6 markscheme

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1. (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
2. If I get an A in this paper, but have an A* in coursework and previous paper, will I get an A* overall?
3. (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
4. (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
5. (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
6. (Original post by happiness12)
No because this paper is worth more than the other paper
Ok thanks
7. (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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8. (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

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9. (Original post by haithamnhaque)
I think It asked for the word equation

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10. (Original post by mxskaan)

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Ohhh ok I didn't add the balanced

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
12. If I put 0.08 dm^3 would I still get marks because I didn't put mol/dm^3?
13. (Original post by happiness12)

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

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14. (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

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15. (Original post by leopard923)
Most likely yes but it depends on the examiner

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Thanks. Hope the examiner is nice then...
16. (Original post by happiness12)

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
17. Im putting marks in so refresh
18. Guys was the amount of pesticides in country E actually 1.26 billion?
19. (Original post by JickDee)
Guys was the amount of pesticides in country E actually 1.26 billion?
yes
20. (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?

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