Edexcel Chemistry Unit 2 (C2) - 14th June 2017 Discussion

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Poll: How did you find the exam?
Really easy 😊 (43)
45.74%
Good 😬 (33)
35.11%
Okay 😐 (12)
12.77%
Not great 🙁 (5)
5.32%
Awful 😱 (1)
1.06%
BenjiManCan
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#1
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#1
How did everyone find the Edexcel C2 exam today?

I think overall it wasn't that bad, a majority of questions were repeated from past papers, although that first 6 marker wasn't great for me.

Also, for the potassium and water reaction, I put:

2K + 2 H2O → 2KOH + H2

Did anyone else get the same?
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H4leem3
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(Original post by BenjiManCan)
How did everyone find the Edexcel C2 exam today?

I think overall it wasn't that bad, a majority of questions were repeated from past papers, although that first 6 marker wasn't great for me.

Also, for the potassium and water reaction, I put:

2K + 2 H2O → 2KOH + H2

Did anyone else get the same?
That's what I got too!
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Zainyg
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what was the empirical formula question answer?
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Noshin21a
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What were some of the point for the first 6 mark question???
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lighth_lawliet
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(Original post by Zainyg)
what was the empirical formula question answer?
Cu2S
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Zainyg
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(Original post by Noshin21a)
What were some of the point for the first 6 mark question???
it's an isotope
isotopes explained
2 extra neutrons in neon 22
20.2 is closer to 20 than 22 because neon 20 is more abundant ( 90% )

the relative atomic mass formula

relative abundance of isotope 1 x its mass + relative abundance of isotope 2 x its mass divided by 100

the calculation:

90 x 20 + 10 x 22 / 100
= 20.2

for the average atomic masses of the isotope leaving a relative atomic mass of 20.2

that's what I remember writing off the top of my head. I wrote more I just can't remember.
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Schoolstudent01
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Same! Does anyone have the unofficial mark scheme or the questions?
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Emily68902
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(Original post by NateRiver)
Cu2S
I got that too
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lighth_lawliet
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https://www.thestudentroom.co.uk/sho....php?t=4780944

Any help in putting together this unofficial markscheme would be appreciated
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mollystandring
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has anyone got an unofficial mark scheme??
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Zainyg
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(Original post by NateRiver)
Cu2S
haha yess that's what I got too, thanks mate
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ChezPlayz
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What about the mass of magnesium maths question, pretty sure the answer was 31.8?
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Olihob
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(Original post by ChezPlayz)
What about the mass of magnesium maths question, pretty sure the answer was 31.8?
Yeah I got that
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Emily68902
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(Original post by ChezPlayz)
What about the mass of magnesium maths question, pretty sure the answer was 31.8?
I got 31.8 as well
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BenjiManCan
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(Original post by Noshin21a)
What were some of the point for the first 6 mark question???
I believe the question was about neon-20 (90% of sample) and neon-22 isotopes (10% of sample), which have a relative atomic mass of 20.2 and the structure of neon-22.

So I think mark scheme will be looking for comments made about them being isotopes, and neon-22 having 10 protons, 12 neutrons (2 more than neon-20) and 10 electrons. Also, as they were looking for comments on structure, you probably could've mentioned the electronic structure (2.8) and that the full shell made it a noble gas.

To explain the 20.2 relative atomic mass, I just used the calculation to work out relative atomic mass, which was something like:

(90*20) + (10*22)/100
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ChezPlayz
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Im thinking i got like 55/60
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Bossj06
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I wrote the same as well
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MIKESPIKE10
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#18
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(Original post by H4leem3)
That's what I got too!
You had to put state symbols as well as it was a 3 marker
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ChezPlayz
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(Original post by MIKESPIKE10)
You had to put state symbols as well as it was a 3 marker
(S) was the state symbol?
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DontJudgeImANerd
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That was insanely easy, I'd be surprised if I didn't get 60/60
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