(AS) OCR Chemistry salters depth paper (10/6/16)

Same, because it said in brackets it should be broad that's why I got a C=H (c-h?) bond instead

I got ethyl ethanoate as well

Yeahh I got that too! But I didn't name it though :/ oops,

Ohh noo I wasn't talking about the Hess's cycle, it was the enthalpy profile diagram.

Same, because it said in brackets it should be broad that's why I got a C=H (c-h?) bond instead

i got a carboxylic O-H peak and a normal C-H peak and something else I cant remember. also got the empirical formula C2H4O

the enthalpy was sneaky because it asked you about the formation of NO in the previous question and then asked you to draw the enthalpy profile diagram for NO2 so I'm guessing quite a lot of people will have drawn it the wrong way round

i got a carboxylic O-H peak and a normal C-H peak and something else I cant remember. also got the empirical formula C2H4O

What? The compound wasn't a carboxylic acid or an ester, it's an aldehyde (ethanal) because the molecular ion peak had the mass of 43 and the Mr of the C2H4O is 44 and thus it's radical fragment is H which is -1. Plus the wavenumber was for an aldehyde, they tried to trick you because both aldehydes and esters were in the same wave number region

The Molecular ion was 88. Thus it cannot be ethanal. Seems you may have been tricked. I admit i thought it was an aldehyde at first

But type the empirical formula in google, it's an aldehyde

Was your paper B salters or A ?

ahhhhhh i see the error of my ways - it was A - very sorry for any confusion caused

Jesus christ haha

aha its been a long week - please don't judge

I understand

Wow! how many marks was that question