Edexcel IAL Chemistry Unit 01 - 26th of May, 2017

They didn't specify it , they just said write down the first 2 processes so I wrote ionization and acceleration. How about the last question about polymer what did you do ?

they actually asked that after they r converted to ions write the three other processes . I wrote acceleration, deflection, detection

Reply 181

zooshan

10

Original post by shahida sulaiman

they actually asked that after they r converted to ions write the three other processes . I wrote acceleration, deflection, detection

i wrote the same..

Reply 182

Pink_Sparkles

18

Original post by zooshan

i wrote the same..

do u know what u wrote for the peak question which was on 28? People here r saying its Fe2+ I dont understand how , I wrote silicon

Reply 183

zooshan

10

Original post by shahida sulaiman

do u know what u wrote for the peak question which was on 28? People here r saying its Fe2+ I dont understand how , I wrote silicon

isnt it sillicon.. :/

Reply 184

Mahdi4

3

Original post by Droneon

Maybe they will penalise it once only.

Posted from TSR Mobile

So will i lose 1 mark only?

Reply 185

Ddde

1

Original post by Matt_levar

I put in Si + as the species, and yes the ppm was 2.7.
The answer to the organic compound question was A unfortunately.
Can't remember my lattice value exactly, but it was something along the lines of -2000kJ.

Nice! Do you think I'll get a mark for putting Silicon rather than the ion?
And what was the answer to the question about the reason why the enthalpy change was difficulT to measure, I put the atoms aren't in gaseous state.

Reply 186

Ddde

1

Original post by zooshan

isnt it sillicon.. :/

Same. I wrote silicon

Reply 187

sasoki9

4

the reason it is Fe2 is because it said it was part of substance X which means its definitely iron and so after that you have to think what m/e value gives you 28 m=the molecular mass and e=the charge of the ion and so 56 divided by 2 give you 28

Reply 188

Pink_Sparkles

18

Original post by sasoki9

the reason it is Fe2 is because it said it was part of substance X which means its definitely iron and so after that you have to think what m/e value gives you 28 m=the molecular mass and e=the charge of the ion and so 56 divided by 2 give you 28

yeah but cant silicon be a part of substance X ?? They didnt say anything about it being an isotope of it or relating the substance in anyway to only iron :/ .I think its silicon cuz they said the peak is at 28 and in a graph of mass spectrometer the peak of a certain substance shows the atomic mass of that substance so I still dont get it why 28 will be Fe 2+

Reply 189

Pink_Sparkles

18

Original post by zooshan

isnt it sillicon.. :/

Idk they say its wrong :frown:

Reply 190

Hola1234

4

Does any one here use kik?

Reply 191

zooshan

10

Original post by Hola1234

Does any one here use kik?

kik?

Reply 192

Droneon

13

Original post by shahida sulaiman

yeah but cant silicon be a part of substance X ?? They didnt say anything about it being an isotope of it or relating the substance in anyway to only iron :/ .I think its silicon cuz they said the peak is at 28 and in a graph of mass spectrometer the peak of a certain substance shows the atomic mass of that substance so I still dont get it why 28 will be Fe 2+

No the whole sample contained only the isotopes of iron, cuz that's how we could calculate the RAM at the beginning of the question.

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Reply 193

umang-23

9

Original post by Luj99

And how is the solid ionized guys ? I wrote the solid is converted to a gas and the gaseous sample is bombarded with high energy electrons thus producing a unipositively charged ion. And for part 2 , I wrote 1st=ionization 2nd=acceleration 3rd=deflection. In ionization gaseous sample is bombarded with high energy electrons . In acceleration the the ions are accelerated by electric field

Don't you use a velocity selector to control velocity of the ions before they are accelerated through a magnetic field?

Reply 194

Franklin123

11

Original post by Luj99

I didn't balance it but I wrote the equation correctly and I did show the continuation

I write the equation well, but how do you write the continuation of polymer?

Reply 195

Hridita Bal

7

What do you think would be the grade boundary for this paper?

Reply 196

sasoki9

4

Original post by shahida sulaiman

yeah but cant silicon be a part of substance X ?? They didnt say anything about it being an isotope of it or relating the substance in anyway to only iron :/ .I think its silicon cuz they said the peak is at 28 and in a graph of mass spectrometer the peak of a certain substance shows the atomic mass of that substance so I still dont get it why 28 will be Fe 2+

okay, let me elaborate more, you see the peaks given in a mass spectrometer the ones on the x-axis are the m/e mass over the charge of the ion and the y-axis is its abdundance. sometimes when the atom is bombarded the electrons remove more than one electron so in this case it removed two from the iron atom so the charge or e became +2 so the x-axis value is 28 and since m/e gives 28 so 28 multiplied by 2 gives you the isotope of iron which was 56. Also, the sample injected was only iron it wasnt a compound so it cant contain other elements like silicon.