GCSE OCR 21st Century Triple Science (CBP1-7) Thread Watch

Swag>education
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#2501
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#2501
(Original post by Sulfur)
Change in energy = energy to break - energy to make (or products - reactants) I thought I was right... maybe I'm not!
If it was positive it would've been endothermic that reaction was DEFINATLY exothermic
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Swag>education
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#2502
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#2502
Thought it was a really easy paper abit too easy and I thought I knew all the answers probably only lost marks on 6 markers or maybe I got alot wrong and thought it was right lol
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azo
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#2503
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#2503
I just googled it and esterification is a reversible reaction so Mary was correct! Yay!
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Scim
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#2504
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#2504
(Original post by Swag>education)
If it was positive it would've been endothermic that reaction was DEFINATLY exothermic
You don't get marked on the positive or negative energy change. Here is the mark scheme for a energy change question, they ignore the sign.
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Swag>education
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#2505
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#2505
(Original post by Sulfur)
Masses? The one on the top of the page?

m = c x v
(40x250) / 1000
1000/1000 = 1g

Then for sulphuric acid:

Total mass of sodium hydroxide was 40x2 = 80
Total mass of sulphuric acid was 98
40g given
98(40/80) = 49g
I got these answers
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olmyster911
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#2506
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#2506
Haber Process 6 marker:
- reactants recycled which means there's a constant supply
- reaction is fast so equilibrium cannot be achieved, unlike in the flask which is why it went so slowly
- pressure in the flask was normal, whereas it's 200 in the haber process and favours the forwards reaction to achieve a higher yield of ammonia
- temperature in the haber process increases the rate of reaction, whereas I guessed the temp in the flask wouldn't have been 450°C so wouldn't have gone fast


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MCMXCVIII
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#2507
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#2507
That paper was so easy


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Swag>education
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#2508
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#2508
(Original post by Scim)
What did you guys get for the balancing equations question? I ended up with some weird answer as they didn't mark the places where you needed to place the numbers... At least I'll get a mark for the right equation?
The one for butanol ad oxygen? It was one butanol and 5 O2 =4co2 and 5h2o I think
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Sulfur
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#2509
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#2509
Any predictions on boundaries? It won't be that high because there were some tricky questions, lots of maths and the six markers weren't that difficult but still not that easy to be honest
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Sulfur
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#2510
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#2510
(Original post by Swag>education)
The one for butanol ad oxygen? It was one butanol and 5 O2 =4co2 and 5h2o I think
I thought it was 6O2 and 4CO2 etc?
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bankruptline
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#2511
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#2511
I was so happy with that paper!
It was so much easier than I expected :yeah:
What did everyone else put for the atom economy question?
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Krollo
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#2512
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#2512
I quite liked that paper. I think I got most of the short answers and calculations right, but the 3 markers always seem to screw me over. 6 markers were decent, so I'm hoping for about 50/60.

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bankruptline
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#2513
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#2513
I got

C4H9OH + 6O2 ------> 4CO2 + 5H2O

For the balanced equation one. Don't know whether this is right or not.
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olmyster911
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#2514
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#2514
(Original post by Sulfur)
Any predictions on boundaries? It won't be that high because there were some tricky questions, lots of maths and the six markers weren't that difficult but still not that easy to be honest
Since the Jun 2013 was 37 for A*, I'm guessing maybe 41-44 for A*
'13 had more maths.
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Krollo
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#2515
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#2515
(Original post by bankruptline)
I got

C4H9OH + 6O2 ------> 4CO2 + 5H2O

For the balanced equation one. Don't know whether this is right or not.
I think I got that too, and it seems to balance, so hopefully we are correct.

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ToLiveInADream
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#2516
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#2516
Such an AMAZING paper, wtf>!
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ToLiveInADream
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#2517
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#2517
(Original post by bankruptline)
I got

C4H9OH + 6O2 ------> 4CO2 + 5H2O

For the balanced equation one. Don't know whether this is right or not.
I got that too, so I hope soo!

What did everybody get for ethanol? I got C2H5OH
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ToLiveInADream
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#2518
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#2518
(Original post by bankruptline)
I was so happy with that paper!
It was so much easier than I expected :yeah:
What did everyone else put for the atom economy question?
8/52 x 100 = 15.4
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bankruptline
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#2519
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#2519
(Original post by ToLiveInADream)
I got that too, so I hope soo!

What did everybody get for ethanol? I got C2H5OH
That's what I put as well. Hopefully that's right :P
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ToLiveInADream
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#2520
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#2520
What did everyone get for the masses calculation questions?

1) 1g
2) 98 RFM
3) 49
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