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

Reply 8

TNOD333

Original post by alexis7869

did you also get 200 and something for the scale factor?

Got 231.8 for the scale factor

Reply 9

alexis7869

Original post by TNOD333

I got 62.7 for the final temperature
43.6 (🔺T) 19.1 (initial temperature)

thank youuuu so much

(edited 4 years ago)

Reply 10

alexis7869

Original post by TNOD333

Got 231.8 for the scale factor

yesssssssss i think you had to divide the two values to get it

Reply 11

alexis7869

Original post by TNOD333

Got 231.8 for the scale factor

what about for the enthalpy of combustion, hess’s law?

Reply 12

TNOD333

Original post by alexis7869

what about for the enthalpy of combustion, hess’s law?

Got -160 for enthalpy of combustion

Reply 13

alexis7869

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

Reply 14

TNOD333

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

Reply 15

Jack-Norrie

For the Hydrogen Bonding question, I got this

-For the Skeletal Acid structure, I got this

Reply 16

Jack-Norrie

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.

Reply 17

Jack-Norrie

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.