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# OCR Chemistry Salters B F331 27th May 2016 (Old specification) Watch

1. (Original post by MBrooke)
I got 0.23 but I don't reckon thats right, I got like 0.6 for mass I think
What was the first calculation any way???? I forgot lol

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2. (Original post by Kira Yagami)
Pretty sure I got the first 2 1 mark calc wrong.

0.23 and like 0.5 something grams..

Did you put 0.74 for the mole % of Kno3 ?
For the percentage I got 33.something%

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3. (Original post by Kwaks)
Ooooooooo thank you

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fml good luck to you Ima go and study now....should have practiced the math part see you in two weeks time ahaha
4. For the first one did:

192/23 = 8.347826.......
Ans X 100 = 834.7826....g

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5. (Original post by Kwaks)
For the percentage I got 33.something%

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Something about moles of something lol

Like oxygen is 23%

So i did 100 23/100
6. (Original post by sam2222)
fml good luck to you Ima go and study now....should have practiced the math part see you in two weeks time ahaha
Ahaha see you soon 👍

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7. (Original post by Kwaks)
For the first one did:

192/23 = 8.347826.......
Ans X 100 = 834.7826....g

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oh shiiiiit I think I did that...but then I don't know if I crossed it out.... fuccck
8. (Original post by Kira Yagami)
Something about moles of something lol

Like oxygen is 23%

So i did 100 23/100
I did:

192/23 = 8.347826.......
Ans X 100 = 834.7826....g

Because you have to work out the mass of air and you already know how much oxygen you have in that air. (I don't know if that is right)

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9. (Original post by sam2222)
oh shiiiiit I think I did that...but then I don't know if I crossed it out.... fuccck
Yeahhhh at first I thought the number was way too big

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10. I got the same for all, apart from the KNOW one. I knew the answer I got was probably wrong lol
11. (Original post by MBrooke)
I got 0.23 but I don't reckon thats right, I got like 0.6 for mass I think
I put 0.059 for the mass
12. also before I go what equation did you guys put the for the reaction Mg with water I put Mg(s) + 2H2O(l) ---> Mg(OH)2 (aq) + H2(g)
13. This paper was similar to the last years soI'd say about 45 ish for an A 44-46 for an A maybe.
14. (Original post by sam2222)
also before I go what equation did you guys put the for the reaction Mg with water I put Mg(s) + 2H2O(l) ---> Mg(OH)2 (aq) + H2(g)
I got the exact same thing

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15. (Original post by Kira Yagami)
This paper was similar to the last years soI'd say about 45 ish for an A 44-46 for an A maybe.
I hope they make it even lower lol 😂 since its the last year. But we all know examiners aren't that nice 😂

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16. (Original post by Kwaks)
I got the exact same thing

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Same
17. So stupid for that magnesium equation I did everything correct...

BUT I PUT M INSTEAD OF MG ...

how many marks would I lose
18. (Original post by meg16)
Same
I wasn't sure if the Mg(OH)2 was solid or aqueous 😩

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19. (Original post by Kira Yagami)
So stupid for that magnesium equation I did everything correct...

BUT I PUT M INSTEAD OF MG ...

how many marks would I lose
Oh crap! I think it was only two. 1 for the equation and 1 for state symbols. I'm sure you'll be fine 👍

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20. (Original post by Kwaks)
Oh crap! I think it was only two. 1 for the equation and 1 for state symbols

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Do you think, if they're nice I put get the mark for the correct equation too?

Oh man lol what is wrong with me... Like I do the 'hard' part right...

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