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

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stm_
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How did everyone find the paper? I have no idea but it was better than the breadth paper for sure
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elisha.marsh
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(Original post by stm_)
How did everyone find the paper? I have no idea but it was better than the breadth paper for sure
I thought it was good the branched carboxylic acid was a bit mean and the pV=nRT question was also a bit mean with all the units
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aliyah99
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I did my enthalpy profile diagram the wrong way!! I'm so DUMBBB! The rest of it was okay though. How many marks do you think I've lost for that question? I am so annoyed at myself for getting it wrong!!!
Also what did you guys get for the structure at the end?
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elisha.marsh
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(Original post by aliyah99)
I did my enthalpy profile diagram the wrong way!! I'm so DUMBBB! The rest of it was okay though. How many marks do you think I've lost for that question? I am so annoyed at myself for getting it wrong!!!
Also what did you guys get for the structure at the end?
methylpropanoic acid
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Jamesinatr
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(Original post by elisha.marsh)
methylpropanoic acid
Oops :/

I got ethyl ethanoate (ester). What's the difference regarding IR spectra and mass spectra? They both have the same molecular formula.
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Jamesinatr
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(Original post by aliyah99)
I did my enthalpy profile diagram the wrong way!! I'm so DUMBBB! The rest of it was okay though. How many marks do you think I've lost for that question? I am so annoyed at myself for getting it wrong!!!
Also what did you guys get for the structure at the end?
What enthalpy profile diagram? Did I miss a page or something?

Edit: oh, you mean the Hess cycle?
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aliyah99
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(Original post by Jamesinatr)
What enthalpy profile diagram? Did I miss a page or something?

Edit: oh, you mean the Hess cycle?
Yeah that one! But I just looked in book and I thiink I just drew the arrow going downwards instead of upwards so not as bad as I thought!
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aliyah99
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(Original post by elisha.marsh)
methylpropanoic acid
Yeahh I got that too! But I didn't name it though :/ oops,
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Jamesinatr
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(Original post by aliyah99)
Yeahh I got that too! But I didn't name it though :/ oops,
I just googled the name

The specification says we don't need to be able to name esters, carboxylic acids, acid anhydrides etc, so a structural formula and the word 'ester' should be fine I would guess.
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Jamesinatr
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(Original post by aliyah99)
Yeah that one! But I just looked in book and I thiink I just drew the arrow going downwards instead of upwards so not as bad as I thought!
Wait, what was the question? I thought they gave you combustion and asked you to work out formation, so aren't the arrows supposed to point downwards?
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aliyah99
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(Original post by Jamesinatr)
I just googled the name

The specification says we don't need to be able to name esters, carboxylic acids, acid anhydrides etc, so a structural formula and the word 'ester' should be fine I would guess.
Okay that's alright then. But I thought it was a carboxylic acid not an ester?
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aliyah99
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(Original post by Jamesinatr)
Wait, what was the question? I thought they gave you combustion and asked you to work out formation, so aren't the arrows supposed to point downwards?
Ohh noo I wasn't talking about the Hess's cycle, it was the enthalpy profile diagram.
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aliyah99
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Also Jamesinatr when did you have to work out the enthalpy change of formation? I do not remember a question on that!?
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Jamesinatr
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(Original post by aliyah99)
Also Jamesinatr when did you have to work out the enthalpy change of formation? I do not remember a question on that!?
I probably misread it or forgot the question then, sorry
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Jamesinatr
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(Original post by aliyah99)
Okay that's alright then. But I thought it was a carboxylic acid not an ester?
I guess it is then. Do you remember what the IR peak was?
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Joshua98
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(Original post by Jamesinatr)
Oops :/

I got ethyl ethanoate (ester). What's the difference regarding IR spectra and mass spectra? They both have the same molecular formula.
I got ethyl ethanoate as well
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stm_
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For an O-H bond, does the peak always have to be broad because it wasn't in the last question
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aliyah99
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(Original post by Jamesinatr)
I guess it is then. Do you remember what the IR peak was?
I found the c=o peak and the o-h peak I don't remember the exact numbers but it was in the range on the formula sheet.
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Joshua98
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(Original post by aliyah99)
I found the c=o peak and the o-h peak I don't remember the exact numbers but it was in the range on the formula sheet.
The o-h peak should have been broad then but it was not. I found no o-h peak.
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stm_
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(Original post by Joshua98)
The o-h peak should have been broad then but it was not. I found no o-h peak.
Same, because it said in brackets it should be broad that's why I got a C=H (c-h?) bond instead
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