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

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Reply 100
Avatar for Kwaks
Kwaks
9
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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Reply 101
Avatar for Kwaks
Kwaks
9
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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Original post by Kwaks
Ooooooooo thank you :smile:


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fml :frown: good luck to you Ima go and study now....should have practiced the math part :frown: see you in two weeks time ahaha
Reply 103
Avatar for Kwaks
Kwaks
9
For the first one did:

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


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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
Reply 105
Avatar for Kwaks
Kwaks
9
Original post by sam2222
fml :frown: good luck to you Ima go and study now....should have practiced the math part :frown: see you in two weeks time ahaha


Ahaha see you soon 👍


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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
Reply 107
Avatar for Kwaks
Kwaks
9
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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Reply 108
Avatar for Kwaks
Kwaks
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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Reply 109
Avatar for tgwpwf
tgwpwf
I got the same for all, apart from the KNOW one. I knew the answer I got was probably wrong lol
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
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)
This paper was similar to the last years soI'd say about 45 ish for an A 44-46 for an A maybe.
Reply 113
Avatar for Kwaks
Kwaks
9
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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Reply 114
Avatar for Kwaks
Kwaks
9
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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Reply 115
Avatar for meg16
meg16
1
Original post by Kwaks
I got the exact same thing


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

BUT I PUT M INSTEAD OF MG ...

how many marks would I lose :frown:
Reply 117
Avatar for Kwaks
Kwaks
9
Original post by meg16
Same


I wasn't sure if the Mg(OH)2 was solid or aqueous 😩


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Reply 118
Avatar for Kwaks
Kwaks
9
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 :frown:


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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(edited 7 years ago)
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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