# Chemistry 1C june 2023 exam 22nd May

Chat about revision, questions and answers regarding the igcse chemistry paper 1 exam

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ask myself and other students like yourselves anything relating to chemistry and the paper 1 exam of the Pearson edexcel 1C 22nd of May.
What did you get for x
Original post by amm89
What did you get for x

10
Original post by themonke
10

How did you I got 4
Original post by amm89
How did you I got 4

Subtract final mass from mass of crucible to get mass of anhydrous sodium sulfate
Subtract final mass from initial to get mass of water evaporated
Do mass/Mr for both to find moles of each
put it in a ratio of water:sodium sulfate (I think it was 0.25:0.025) and divide by the smallest number
you will get a ratio of 10:1 so x = 10
(edited 11 months ago)
Did you guys get around -3594kJ/mol for the ΔH 5 marker?
Original post by themonke
Subtract final mass from mass of crucible to get mass of anhydrous sodium sulfate
Subtract final mass from initial to get mass of water evaporated
Do mass/Mr for both to find moles of each
put it in a ratio of water:sodium sulfate (I think it was 0.25:0.025) and divide by the smallest number
you will get a ratio of 10:1 so x = 10

Oh did you get 4.5 for the mass of water
(edited 11 months ago)
Original post by themonke
Did you guys get around -3594kJ/mol for the ΔH 5 marker?

Yes around that number it had 3594.333 as well
Does anyone else think the grade boundaries could be 90% + this year? That paper was not very difficult.
Original post by amm89
What did you get for x

i got 10 did you?
Original post by Sachef
Does anyone else think the grade boundaries could be 90% + this year? That paper was not very difficult.

everyone in my school said it was difficult so boundaries will remain low. it was somewhat smooth
Original post by themonke
Subtract final mass from mass of crucible to get mass of anhydrous sodium sulfate
Subtract final mass from initial to get mass of water evaporated
Do mass/Mr for both to find moles of each
put it in a ratio of water:sodium sulfate (I think it was 0.25:0.025) and divide by the smallest number
you will get a ratio of 10:1 so x = 10

exactly what i got. i saw your name on the maths exam discussion as well. we're both doing very well.
Original post by amm89
Yes around that number it had 3594.333 as well

yea i got -3594.13 i think cus i rounded to 0.00409 moles
Original post by itayrofe
yea i got -3594.13 i think cus i rounded to 0.00409 moles

I didn't round it, just stored it in my calc and got -3593.33. Most people in my school got that as well... Doubt they will mark down for rounding early tho
Original post by milkybreath_
I didn't round it, just stored it in my calc and got -3593.33. Most people in my school got that as well... Doubt they will mark down for rounding early tho

yea tbh i think you're good
Original post by itayrofe
i got 10 did you?

No but most people go that I got 4. What was the mass of the water
Original post by amm89
No but most people go that I got 4. What was the mass of the water

I think it was 4.5 because of 8.05-3.55 thus water was 4.5 and then divide it by mr to get 0.25 and the 0.25 divide by 0.025 to get 10 moles with it basically being a 1:10 ratio
Original post by itayrofe
I think it was 4.5 because of 8.05-3.55 thus water was 4.5 and then divide it by mr to get 0.25 and the 0.25 divide by 0.025 to get 10 moles with it basically being a 1:10 ratio

Oh I did do that what was the sodium part ?
Original post by amm89
Oh I did do that what was the sodium part ?

moles for sodium part was 0.025 and moles for water were 0.25 so (1:10)