# IGCSE Edexcel Chemistry Paper 1

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Original post by yoowan
How did y'all find the paper?
I felt that the paper was a little harder than past papers that i've done before ðŸ˜¬
Think it went quite well for me - had done very similar questions before so luckily didnâ€™t need to think too much. Definitely preferred it to Biology. Which ones did you find difficult?
guys what are the main topics of the exam??
Original post by GotNoWifi
yh they do it will say 'accept 560' on the mark scheme cuz ive done similar questions before
I definitely think so, especially because it allows students to not he confident with their answer to the first part but still ensure they get full marks on the second.
Yeah, I think I got the same as all of your (updated) calculation answers. Rf was probably a little different but Iâ€™m sure thereâ€™s an acceptable rangeâ€¦

I reckon Rf value accept range is prolly 6.1-6.3 cuz some ppl measured 4.1cm for the distance travelled by dye
Original post by GotNoWifi
I reckon Rf value accept range is prolly 6.1-6.3 cuz some ppl measured 4.1cm for the distance travelled by dye
Yeah sounds fair enough - btw you mean 0.61-0.63, right?
Original post by ThatGuyJimmehFr
550 is right but Iâ€™m almost 100% sure theyâ€™ll accept 560 as well because thatâ€™s the approximate value they give you

yeah i did -560 because they didnt specify which value to use which was annoying
Yeah sounds fair enough - btw you mean 0.61-0.63, right?

yh mb
Original post by asbingh
The last question was very similar to 2021 paper in june

All the questions were the same to 2021 juunes past paper I looked and most of them are exactly the same/similiar
Original post by sizorig
yep it was, i want to check the calculation answers with yall:
1) Isotopes calculation: 24.3
2) RF value = 0.615
3) number behind the compound (mole calculations): x = 18 (correct answer = 14) y = 10 or 9 (i cant remember) z = 10 or 9
4) 2755 for Q
5) 0.0085 for the enthalopy change question for magnesium pieces (correct answer = -550kj/mol)
These are all i can remember

Wait for the r isotope one I got 12.3? R u talking abt the one like the RAM so u do the sum over 100
Original post by Ariana1880
Wait for the r isotope one I got 12.3? R u talking abt the one like the RAM so u do the sum over 100
huh pretty sure it was 24.3, no? maybe you didnâ€™t add number of protons and neutrons together?

1.

Fill in the table: lithium conducts electricity, lithium forms a basic oxide, bromine is the liquid at room temperature, diamond has a giant covalent structure, ethene forms polymers + test for chlorine; damp blu litmus paper turns red then bleaches

2.

Magnesium atom: group 2 and period 3, calculating the number of electrons in one mole; 7.2 x 10^24, compound formed with fluorine, calculating Ar; 24.3

3.

Metals and their reactions with water and hydrochloric acid

4.

Caffeine question; number of elements, Ar; 194, equation to form nitric acid, harmful effects of acid rain

5.

Chromatography

6.

Marbles in hydrochloric acid; cotton wool, why the mass decreases, describing graph, explain the effect of using smaller marble chips

7.

Nitrogen and its compound; nitrogen dot and cross, Ammonium carbonate

8.

C4H8 isomers

9.

Hydrated potassium aluminium sulphate

10.

Enthalpy change question

Hey guys, this is all I remember; feel free to add on
Original post by ThatGuyJimmehFr
think I got close to 100%, Iâ€™m v confident on everything except the Rf chromatography which I for sure got wrong

I realised I did the equation there wrong way round ðŸ¥²
Original post by sizorig
yep it was, i want to check the calculation answers with yall:
1) Isotopes calculation: 24.3
2) RF value = 0.615
3) number behind the compound (mole calculations): x = 18 (correct answer = 14) y = 10 or 9 (i cant remember) z = 10 or 9
4) 2755 for Q
5) 0.0085 for the enthalopy change question for magnesium pieces (correct answer = -550kj/mol)
These are all i can remember

Yes I got x = 18, y = 10 or 9, z = 10 or 9 I donâ€™t remember which way round I put them
I got -550 enthalpy change
And 24.3 for isotopes
Yk the question where we had to find the value of X from like a hydrous -> anhydrous reaction I got X = 12
Did anyone else?
huh pretty sure it was 24.3, no? maybe you didnâ€™t add number of protons and neutrons together?

Yeah I realised I didn't add the protons and neutrons ðŸ˜­
Original post by aaefggf
Yes I got x = 18, y = 10 or 9, z = 10 or 9 I donâ€™t remember which way round I put them
I got -550 enthalpy change
And 24.3 for isotopes
Yk the question where we had to find the value of X from like a hydrous -> anhydrous reaction I got X = 12
Did anyone else?
yep, think I got twelve for that that one too.
Original post by Ariana1880
Yeah I realised I didn't add the protons and neutrons ðŸ˜­
ah no worries, itâ€™s only 1 or 2 marks out of 180 after all so shouldnâ€™t change much
Was the caffeine one simple molecular? So for calcium bromide talk abt electrostatic force of attraction like ionic stuff then was caffeine just simple molecular and weak intermolecular forces
ik the answer is -550kJ/mol for enthalpy change but why not -1100kJ/mol? as in when we found the kJ previously we found the energy transfer for nitric acid, so why not convert the 0.005 moles from the 1:2 ratio between the MgNO3?

or am i over complicating it? was there anything in the question that alluded to using the Mg moles?
Original post by taehvnluvr
ik the answer is -550kJ/mol for enthalpy change but why not -1100kJ/mol? as in when we found the kJ previously we found the energy transfer for nitric acid, so why not convert the 0.005 moles from the 1:2 ratio between the MgNO3?
or am i over complicating it? was there anything in the question that alluded to using the Mg moles?

ignore the smiley face that was a mistake lol
Original post by aaefggf
Yes I got x = 18, y = 10 or 9, z = 10 or 9 I donâ€™t remember which way round I put them
I got -550 enthalpy change
And 24.3 for isotopes
Yk the question where we had to find the value of X from like a hydrous -> anhydrous reaction I got X = 12
Did anyone else?

yeah i got x=12 aswell for the anhydrous one