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AQA GCSE Chemistry C2/C3 May 15th 2014

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Reply 380

Bilalnaseerr

Original post by gcser

What did you get for the bond energies calculation on C3? I got 400 something...

I got the same; hope we're correct🙏

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Reply 381

Eats

How did you get 0.2288?? I got 0.175

Reply 382

S.Ahmad

Original post by DazBoy

I don't c3 was that much easier than June 2013..I think it's probably gonna be about 44-46 for an A*

Yup, they're the usual grade boundaries, if statistics show this years papers were easier, the maximum mark leeway is roughly 2-3 from last years grade boundaries.

Reply 383

connor_silom

Original post by chemdude112

I got 0.2288 and then rounded it to 3sf to get 0.229

I got this but i didn't round :smile:

Reply 384

Rubato

I got 0.2288 and rounded it to 0.289. I was actually smiling when I saw the calorimetry 6 marker cause I just revised it before walking in haha xD
And I balanced the half equation wrong despite balancing it correctly every other time -_-

Reply 385

georgie1997

Rough grade boundaries for c2??

Reply 386

S.Ahmad

Original post by Eats

How did you get 0.2288?? I got 0.175

Acid = Alkali
Concentration1 x volume1 = concentration2 x volume2
Substitute into the formula.
Concentration1 x 25 = x
Carry over the x from the Alkali side, making it a division.
25 / x = ANS.

Reply 387

connor_silom

concentrain was 0.200

Reply 388

sophannahxo

what does everyone think the rough grade boundaries will be for Unit 2 and Unit 3?

Reply 389

Emerald123

I got 100 ums in chemistry unit 3 exam last year in year 10!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :smile:

And the grade boundry was 42 to get A*

(edited 9 years ago)

Reply 390

interstitial

Original post by Emerald123

I got 100 ums in chemistry unit 3 exam last year in year 10!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :smile:

Cool story bro. Tell it again.

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Reply 391

Eats

If I done acid: alkali would I get a mark??

Reply 392

Bilalnaseerr

Original post by Eats

How did you get 0.2288?? I got 0.175

You got it wrong because my chem teacher said my answer was right

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Reply 393

venerable crow

Which gas was given off in the hard water question

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Reply 394

TripleScience

Original post by S.Ahmad

Acid = Alkali
Concentration1 x volume1 = concentration2 x volume2
Substitute into the formula.
Concentration1 x 25 = x
Carry over the x from the Alkali side, making it a division.
25 / x = ANS.

You're correct until the last past.
ANSWER=x/25=0.2288
I then rounded the concentration to three significant figures considering that the question gave the known concentration to three figures (0.200g/dm^3) and gave my answer as 0.229 grams per decimetre cubed.