OCR gateway chemistry gcse (triple)

There wasn’t anything that jumped out at me that I had no clue how to do, but I still think it was pretty tricky. For that question I said on the one hand the graph didnt show much of a link as decreasing co2 still raised sea levels, however co2 doesnt decrease till 2005 so this would increase temperature and levels would continue rising even after it decreased?

Original post by person1143

How did everyone find it? And was it just me who was really confused by the co2 emissions and sea levels graph? What did you all say for that

Reply 2

OP

Similar to what I said- I just wasn’t sure when writing it, not sure why. Can you remember what you got for the last page of maths questions? I got 4.5 for the gas volume one and something like 0.3986 for the last

Original post by person1143

Similar to what I said- I just wasn’t sure when writing it, not sure why. Can you remember what you got for the last page of maths questions? I got 4.5 for the gas volume one and something like 0.3986 for the last

I think I got 2.2 for the gas volumes but the similar thing for the last question :biggrin:

Reply 4

There wasn’t anything that jumped out at me that I had no clue how to do, but I still think it was pretty tricky. For that question I said on the one hand the graph didnt show much of a link as decreasing co2 still raised sea levels, however co2 doesnt decrease till 2005 so this would increase temperature and levels would continue rising even after it decreased?

Original post by person1143

How did everyone find it? And was it just me who was really confused by the co2 emissions and sea levels graph? What did you all say for that

Original post by person1143

Similar to what I said- I just wasn’t sure when writing it, not sure why. Can you remember what you got for the last page of maths questions? I got 4.5 for the gas volume one and something like 0.3986 for the last

Yeah I got 0.3986, and acid excess, and something else for gas volume i cant remember now, what was the reaction?

Reply 5

Oh now i remember I got 2.2 as well!

Reply 6

OP

Oops I think I multiplied the number of moles by 2 when I shouldn’t have. Hopefully that’s only one mark lost

Original post by person1143

Oops I think I multiplied the number of moles by 2 when I shouldn’t have. Hopefully that’s only one mark lost

did you find the rest of it okay? :smile:

Reply 8

OP

I think so- not sure about the improving experiment question with burning methane and the condensation polymerisation question but other than that I think it went okay

OP

What about you?

What did all of you write for the condensation polymerisation equation (4 marker)?I believe the 2 you should have picked were ethanol diol and ethanedioic acid and then formed an equation out of them with water as one of the products

Reply 11

OP

That’s what I did but just put polyester + water as the products in the reaction as had no clue what it should be. Then talked about how the hydroxyl and carboxyl groups form water leaving the Ester groups in the polymer

Reply 12

emmathornton_113

5

omg i wrote that but chose the one with 1 and 2 in its name and ethanedioic acid?! :frown:

And i got 0.05 in the last question that was such a tricky paper jesus im pretty sure i got anything right lol

Original post by Readthetextbook

What did all of you write for the condensation polymerisation equation (4 marker)?I believe the 2 you should have picked were ethanol diol and ethanedioic acid and then formed an equation out of them with water as one of the products

Reply 13

emmathornton_113

5

Grade boundAries better be loooowwww after that disgusting paper

Reply 14

Abiye19

7

I got the same answer but wrote it two d.p, does it matter how many figures you rounded it to?

Original post by via02

Oh now i remember I got 2.2 as well!

Reply 15

don't think so, I did two dp 2.24 or something :smile:

Original post by Abiye19

I got the same answer but wrote it two d.p, does it matter how many figures you rounded it to?

Reply 16

K0302

15

was it just me who thought that some of the multiple choices could be a couple of the answers?

Reply 17

Bignibba445