aqa AS chemistry 2019 23 MAY paper 2 UNOFFICIAL MARK SCHEME

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myth0000
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Lets talk about it!
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alexis7869
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please tell me you got 60 something for the final temperature
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myth0000
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(Original post by alexis7869)
please tell me you got 60 something for the final temperature
lol i think so it was somewhere between 60+70
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alexis7869
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(Original post by myth0000)
lol i think so it was somewhere between 60+70
did you also get 200 and something for the scale factor?
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TNOD333
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I got 62.7 for the final temperature
43.6 (🔺T) + 19.1 (initial temperature)
(Original post by myth0000)
lol i think so it was somewhere between 60+70
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myth0000
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what was the topics of the questions that came up so i can make a mark scheme, i forgot most of em
(Original post by alexis7869)
did you also get 200 and something for the scale factor?
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myth0000
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(Original post by TNOD333)
I got 62.7 for the final temperature
43.6 (🔺T) + 19.1 (initial temperature)
yeah that seems right
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alexis7869
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(Original post by myth0000)
what was the topics of the questions that came up so i can make a mark scheme, i forgot most of em
first question was they gave skeletal formulas and we had to identify that one was a ketone, acid and an aldehyde if i remember correctly, we had to give reagents to identify which would be which

we had a calculation which we had to find the final temperature and i got 60 something (not sure if its correct)

we had a question on methanol, and describe the effects of temperature, pressure and catalyst on the equilibrium yield, reaction rate and costs

last question in the multiple choice part was about infrared spectroscopy

enthalpy change of combustion as a calculation

why was isomer F the product that former the most instead of isomer E

we had a diagram to complete
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TNOD333
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(Original post by alexis7869)
did you also get 200 and something for the scale factor?
Got 231.8 for the scale factor
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alexis7869
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(Original post by TNOD333)
I got 62.7 for the final temperature
43.6 (🔺T) 19.1 (initial temperature)
thank youuuu so much
Last edited by alexis7869; 1 year ago
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alexis7869
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(Original post by TNOD333)
Got 231.8 for the scale factor
yesssssssss i think you had to divide the two values to get it
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alexis7869
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(Original post by TNOD333)
Got 231.8 for the scale factor
what about for the enthalpy of combustion, hess’s law?
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TNOD333
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(Original post by alexis7869)
what about for the enthalpy of combustion, hess’s law?
Got -160 for enthalpy of combustion
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alexis7869
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(Original post by TNOD333)
Got -160 for enthalpy of combustion
do you remember anything else? answers you got for the other questions, what did you choose in the mutiple choice question infrared spectrum
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TNOD333
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(Original post by alexis7869)
do you remember anything else? answers you got for the other questions, what did you choose in the mutiple choice question infrared spectrum
To be honest I wasn’t well of for time and I pretty much spend 30 seconds or less on most multiple choice questions.
For the infrared spectroscopy I got B (the hydroxy one) not sure If its correct though
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Jack-Norrie
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For the Hydrogen Bonding question, I got this

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-For the Skeletal Acid structure, I got this

Name:  fwfwwf.JPG
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Jack-Norrie
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There was a 6 mark question on preparing 250cm3 of acid solution. I believe what you did was to measure beaker with a balance, then measure the mass of the acid and beaker with the balance. Then take the second reading away from the first to get accurate mass. Then add distilled water to the beaker and stir with a glass rod until dissolved. Then add that to a 250cm3 volumetric flask. Then wash the beaker with distilled water again and transfer to the volumetric flask to ensure that all dissolved acid is in the flask. Then add distilled water to the flask until it reaches the line, then state that you need to read from the bottom of the meniscus.
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Jack-Norrie
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There was also a question on CFCs and the Ozone layer depletion. it was split into (a) and (b):
(a) an initiation step for the CFC into the free radicals <-- 1 mark
(b) was this: •CL + O3 ->•CLO + O2
• CLO + 03 -> 2O2 + •CL <-- 2 mark



also, on another note, I also got -160 for the combustion enthalpy question, around 200 and something scale factor, and got something in the high 60's for the final temperature.
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alexis7869
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(Original post by TNOD333)
To be honest I wasn’t well of for time and I pretty much spend 30 seconds or less on most multiple choice questions.
For the infrared spectroscopy I got B (the hydroxy one) not sure If its correct though
i also put down B because of the peaks
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Jack-Norrie
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(Original post by alexis7869)
i also put down B because of the peaks
I think I put the Carboxylic Acid because it had a peak at O-H(alcohols) and at C=O but I could be wrong
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