Loved that paper.
2.25 times greater for one of the questions (haber process).
17% for atom economy
5680 for the moles question (defo wrong!!)
Gas syringe for something
Too much pressure causes explosions or something.

Reply 44

rudikonrath

6

I got that

Original post by thefaketommy123

did find it quite easy, what did people put for the number of times bigger of the yield? I got like 2.25x?

Reply 45

thefaketommy123

6

For the pressure question, it was because of the low temperature, meant it was a slow reaction

Original post by Hudds999

Loved that paper.
2.25 times greater for one of the questions (haber process).
17% for atom economy
5680 for the moles question (defo wrong!!)
Gas syringe for something
Too much pressure causes explosions or something.

Reply 46

username3046474

14

Aaaah I got 2.25!!!! :smile:

Reply 47

mannylozano123

2

One reason high pressure wasn’t used can be for safety , higher than 200 atmospheres is dangerous both are correct!

Original post by thefaketommy123

For the pressure question, it was because of the low temperature, meant it was a slow reaction

Reply 48

Jameslee09870

5

Original post by Hudds999

Loved that paper.
2.25 times greater for one of the questions (haber process).
17% for atom economy
5680 for the moles question (defo wrong!!)
Gas syringe for something
Too much pressure causes explosions or something.

Too much pressure causes explosions? I think it was instead that it shifted the equilibrium to the left making more h2

Reply 49

JAN43

6

I got 2732cm3 for the unreacted oxygen.

Reply 50

newmanb14

12

I got it as evaporating basin and Bunsen burner measuring the mas of the evaporating basin before adding water and after evaporating the water

Original post by Hattyfalcus

Calculating mass of dissolved substances ? Is it condenser and Bunsen burner?

Reply 51

SNA5RI8

7

i got 6050cm cubed
6.67 for the atom economy
58.3 percent

Reply 52

username3046474

14

Anyone get the answer formulation for the tablet one?

Hey guys I've merged together a few threads talking about the same markscheme :smile:

Hope the exam went okay today! :biggrin:

Reply 54

F for Axolotl

6

I got 1250cm^3 for the unreacted volume

Reply 55

meemy123

13

that went really well!! some of the asnwers i got was 2.5 times , 58%

Reply 56

SFerns09

11

Original post by JoshWalters

i got 1250cm3

How??

Reply 57

anaya_26

6

yup

Original post by ShyB

Anyone get the answer formulation for the tablet one?

Reply 58

meemy123

13

aluminium doesnt corrode once made cos it naturallyforms aluminium oxide when reactingwith oxygen

Reply 59

xspx

4

For the oxygen question, I believe the correct answer is 1250cm^3
The equation had 5 moles of oxygen reacting to produce 3 moles of carbon dioxide. The values given were 7.25 dm^3 of oxygen and 3.6 dm^3 of carbon dioxide produced.
To find the volume of oxygen that reacted, you do 3.6*(5/3) to get 6 dm^3 of oxygen. This, taken away from the initial volume of oxygen gave us 1.25 dm^3 of unreacted oxygen.
1.25 dm^3 = 1250 cm^3

AQA GCSE Chemistry Paper 2 Unofficial Markscheme (Higher) - Triple - 12/06/19

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