Gcse aqa chemistry paper 2 unofficial markscheme 13th June 2018

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Oh was that the 50cm3? For that I thought you had to draw a tangent at 95 and then work out the gradient so I got 0.0025cm3

i got 0.0031 so i think there will be a large interval for the correct answer in the markscheme because the tangent can vary between people

Reply 21

koala_prime

Original post by Khaleel1

Oh was that the 50cm3? For that I thought you had to draw a tangent at 95 and then work out the gradient so I got 0.0025cm3

I got 0.003, which is very close so i guess you're right

Reply 22

Hamburguessa

Original post by Khaleel1

For the last question about why a polymer doesn't melt I said because it was a thermosetting polymer that has dlstrong crosslinks between its chains that doesn't break and so doesn't melt

yes i wrote that

Reply 23

Khaleel1

Did u guys get the measurement for the chromotograohy paper at like 4.4 cm or something I did 3.3 something divide by 0.65

Reply 24

Itsxlexi

What did you write for the questions about why did newer cars have a lower percentage of carbon monoxide and why is there a cap on the percentage of unused hydrocarbons?

(edited 5 years ago)

Reply 25

sabiha200119

Original post by Khaleel1

Oh was that the 50cm3? For that I thought you had to draw a tangent at 95 and then work out the gradient so I got 0.0025cm3

Same 👍

Reply 26

Khaleel1

Original post by Hamburguessa

i got 0.0031 so i think there will be a large interval for the correct answer in the markscheme because the tangent can vary between people

Yh should be fine

Reply 27

sabiha200119

Original post by Khaleel1

Did u guys get the measurement for the chromotograohy paper at like 4.4 cm or something I did 3.3 something divide by 0.65

Yup it was 3.2 but yh thats sounds right

Reply 28

Khaleel1

Original post by Kangaroo17

Is it meant to be rounded? As in to a sig fig?

No they said do it in standard form nothing was mentioned about significant figures

Reply 29

Khaleel1

I think I put that they are trying to limit the amount of carbon monoxide produced coz it's a pollutant
And to ensure that manufacturers don't go over the amount of carbon monoxide I'm not sure tho