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Edexcel IGCSE Chemistry Paper 2C-4CH1 12th June 2019

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Reply 80
Avatar for Haiderv1
Haiderv1
I got the last 2 questions wrong cuz I thought u had to use the same formula to work out the number of moles. I did 4/24000 and got somebody long answer. I then used that for the following question so got that wrong as well. Do u think I will get any error carried forward marks?
would I lose marks if I didnt put the test for ions for the potassium bromide and chlorine question?
Reply 82
Avatar for Haiderv1
Haiderv1
I got the same answer but I think it’s wrong
Original post by Suley143
I might have got this wrong i got 0.0417 mol/dm^3 for volume.
That is exactly what I did. For last q i did this calculation=

1/6000 ÷ volume in cm^3/1000 = 0.0417
Original post by Haiderv1
I got the last 2 questions wrong cuz I thought u had to use the same formula to work out the number of moles. I did 4/24000 and got somebody long answer. I then used that for the following question so got that wrong as well. Do u think I will get any error carried forward marks?
Reply 84
Avatar for APZ
APZ
4
Did they have to be metals for the alloys definition as isn’t carbon a non metal and part of steel?

Also what was the answer for the Why Is Oxygen not allowed in fermentation

Also what do you think is the mark scheme for the enthalphy change question
i did 0.0025/0.004 and i got 0.625
Original post by Suley143
That is exactly what I did. For last q i did this calculation=

1/6000 ÷ volume in cm^3/1000 = 0.0417
Do you remember the volume figure in your answer?
Original post by Haiderv1
I got the same answer but I think it’s wrong
yeah same thats what i did
Original post by Suley143
That is exactly what I did. For last q i did this calculation=

1/6000 ÷ volume in cm^3/1000 = 0.0417
Do you remember the figure for volume? - we had to divide it by 1000 to convert it into dm^3.
Original post by zara11413
yeah same thats what i did
Reply 89
Avatar for leo1233
leo1233
8
Original post by APZ
Did they have to be metals for the alloys definition as isn’t carbon a non metal and part of steel?

Also what was the answer for the Why Is Oxygen not allowed in fermentation

Also what do you think is the mark scheme for the enthalphy change question


for the anaerobic one
C6H1206 -> 2C2H5OH + 2CO2
Yeh I did that too
Yeh that’s right I think
Original post by Alaa_Abdelhamid
i did 0.0025/0.004 and i got 0.625
i wrote this exactly
Original post by Suley143
I put to mix both into a beaker. Chlorine is more reactive than bromine and will displace it from its compound to form potassium chloride and bromine as a single free element. The solution would darken to orange as bromine dissolves.
Reply 93
Avatar for blazer7
blazer7
4
Original post by angelnz
I put since the pressure increased, the NO gas particles were closer together and more concentrated, to it looks darker.


yh put the same thing, this is correct
I don't think you exactly need to... if Pottasium Bromide is reduced with chlorine it will change colour to brown, but if (theoretically) if Cl wasn't more reactive then there would be no change
Original post by nerddddo
would I lose marks if I didnt put the test for ions for the potassium bromide and chlorine question?
for your first point i also thought that too so i just said mixing a metal and another element to chemically combine them.
Original post by APZ
Did they have to be metals for the alloys definition as isn’t carbon a non metal and part of steel?

Also what was the answer for the Why Is Oxygen not allowed in fermentation

Also what do you think is the mark scheme for the enthalphy change question
Reply 96
Avatar for mp99
mp99
10
Combustion of ethanol formula?
Got the same 👍
Original post by Suley143
I might have got this wrong i got 0.0417 mol/dm^3 for volume.
C2H6O + 3O2 gives 2CO2 + 3H2O
Original post by mp99
Combustion of ethanol formula?
C2h5oh +3o2 = 2co2 + 3h2o
Original post by mp99
combustion of ethanol formula?

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