SapphirePhoenix1
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#781
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#781
(Original post by Cherrypop13)
yes thats the one i don't know if i'm doing it correctly i got 7.2 x10-3
Yeah, I got that too. My workings are below.

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SapphirePhoenix1
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#782
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#782
(Original post by Hellllpppp)
I don’t know this was all that was released
OH ok
(I haven't actually looked at the assessment materials lol)
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Hellllpppp
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#783
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#783
(Original post by Cherrypop13)
yes thats the one i don't know if i'm doing it correctly i got 7.2 x10-3
Just be careful as it says 3sf so it’s got to be 7.21
Last edited by Hellllpppp; 2 months ago
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Cherrypop13
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#784
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#784
(Original post by Hellllpppp)
Just be careful as it says 3sf so it’s got to be 7.21
ah yes thank you guys
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idk__21
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#785
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#785
does anyone know the answers for these ?
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Hellllpppp
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#786
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#786
(Original post by idk__21)
does anyone know the answers for these ?
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19 - work out moles of buta-1,3-diene and use the 1:1 ratio and mol/concentration = volume, then convert dm3 -> cm3

10 - convert mg->g->mol and convert cm3->dm3
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idk__21
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#787
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#787
(Original post by Hellllpppp)
19 - work out moles of buta-1,3-diene and use the 1:1 ratio and mol/concentration = volume, then convert dm3 -> cm3

10 - convert mg->g->mol and convert cm3->dm3
thank you
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bananas44
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#788
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#788
Does anyone know how to do this question? The answer is D but idk how to get there, TIA

One mole of which of the following chlorides would have the greatest entropy at 750 °C?
A) Sodium chloride
B) Calcium chloride
C) Potassium chloride
D) Magnesium chloride
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sumayaaa
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#789
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#789
hey guys

what chem youtubers do you guys recommend? I do OCR A. I know about allery chemistry and he’s been good. I need a youtuber good at organic chem bc i need to catch up/learn about that

thanksss
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CaptainDuckie
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#790
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#790
(Original post by sumayaaa)
hey guys

what chem youtubers do you guys recommend? I do OCR A. I know about allery chemistry and he’s been good. I need a youtuber good at organic chem bc i need to catch up/learn about that

thanksss

MaChemGuy :yy:
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sumayaaa
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#791
(Original post by CaptainDuckie)
MaChemGuy :yy:
will check him out rn to prepare for tomorrow’s lesson, thanksss
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CaptainDuckie
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#792
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#792
(Original post by sumayaaa)
will check him out rn to prepare for tomorrow’s lesson, thanksss

Preferably both old and new videos are good, but I think the white board style videos are more interactive, feels as though he’s teaching you IRL.
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sumayaaa
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#793
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#793
(Original post by CaptainDuckie)
Preferably both old and new videos are good, but I think the white board style videos are more interactive, feels as though he’s teaching you IRL.
oh okay, yeah i think i prefer those videos.
does he just do OCR A?
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CaptainDuckie
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#794
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#794
(Original post by sumayaaa)
oh okay, yeah i think i prefer those videos.
does he just do OCR A?

Yeah, only OCR A videos. He tries to explain each step too, overall I’d give it 10/10 imo.

Makes tough concepts much easier to understand.
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charco
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#795
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#795
(Original post by bananas44)
Does anyone know how to do this question? The answer is D but idk how to get there, TIA

One mole of which of the following chlorides would have the greatest entropy at 750 °C?
A) Sodium chloride
B) Calcium chloride
C) Potassium chloride
D) Magnesium chloride
I would think that the answer is B rather than D
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hiiiiiiiiiiii2
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#796
(Original post by charco)
I would think that the answer is B rather than D
the positive ion should be the smallest and highest charge, and the negative ion should be large and highly charge so it should be D
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#797
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#797
(Original post by hiiiiiiiiiiii2)
the positive ion should be the smallest and highest charge, and the negative ion should be large and highly charge so it should be D
The magnitude of absolute entropy in ionic compounds depends on the relative strength of the ionic attraction. Weaker = more entropy

Actual values:
MgCl2: 89.62 J K-1 mol-1
CaCl2: 104.62 J K-1 mol-1
[ref: https://webbook.nist.gov/cgi/cbook.c...043524&Mask=2]
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bananas44
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#798
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#798
(Original post by charco)
I would think that the answer is B rather than D
Marking scheme says D
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MTChemist
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#799
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#799
EDEXEL gang
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MTChemist
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#800
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#800
What exam board are you taking?
Edexel
What's your favourite topic in the course so far?
Kinetics
And your least favourite topic?
Reaction mechanisms
What are you hoping to study at university?
Medicine
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