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OCR AS - Chemistry Unit F322 - Chains, energy and resource - REVISION!

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Reply 1100
Avatar for Ttawwab
Ttawwab
2
Anyone close to composing a rough draft of a full mark scheme? I'm sure we've answered most, if not all, of the questions somewhere on this thread anyhow! :smile:
Original post by Moiiu
Yeah you are right. However the question specifically asked for a use apart from fuel so you won't get any marks unfortunately.


Aw man you serious? Felt so smart getting that random use ;(

Exam stress makes u do funny things haha, i wonder how many did a exothermic enthalpy profile instead of endothermic ;p
Reply 1102
Avatar for 04001
04001
does anyone know how many marks that last question was worth??
Original post by amyyy24
Haha, agreed. I tried to get one going, didn't get very far :dontknow:


Aha I saw that it was a very good attempt, I would have tired to help out but I have an awful memory :tongue:

Ah a fellow Med student. Double HI5 :smile:
By the way, the question on the enthalpy graph on the ENDOTHERMIC reaction.
It was definately endothermic.

And when stating the activation energy you have to make sure that its from the BOTTOM of the line where the reactants are to the top of the bell shape. A common mistake is people just think its the line above the line of products
Original post by 04001
does anyone know how many marks that last question was worth??


As far as I can recall it was a ten marker.
Reply 1106
Avatar for bcottle
bcottle
Anyone remember how many marks the tetrahedral one was worth? I wrote the right bond angle and reason for tetrahedral but had some brain malfunction which lead to me putting pyramidal as the name of the shape instead.
Btw what did people write for those bond angles ... ?
Was the one with double bond triganol?
I completely forgot my bond angles
Reply 1109
Avatar for 04001
04001
Original post by bcottle
Anyone remember how many marks the tetrahedral one was worth? I wrote the right bond angle and reason for tetrahedral but had some brain malfunction which lead to me putting pyramidal as the name of the shape instead.


2 i think but it asked why
Reply 1110
Avatar for bcottle
bcottle
Original post by 04001
2 i think but it asked why


Thanks, fingers crossed the mark scheme gives mark for correct reason!
Original post by shooby_doo
Was the one with double bond triganol?
I completely forgot my bond angles


yes it was, no bond angle was required. they only asked for names of the shapes.
btw the first one was tetrahedral.
Original post by shooby_doo
Btw what did people write for those bond angles ... ?


there wasn't any question on bond angle as far as I can recall. But instead the question was to state the shape around Carbon 1 and around Carbon 2. So the first one was Tetrahedral and the 2nd was trigonal planar
Woo yes, full marks for the bond angles! I was stressing over them!
Anyways im curious to know on the question on why to get international awareness on the incineration of plastics?
What did you guys put?
Original post by bcottle
Anyone remember how many marks the tetrahedral one was worth? I wrote the right bond angle and reason for tetrahedral but had some brain malfunction which lead to me putting pyramidal as the name of the shape instead.

1 mark, dw u'll b fine as it is only 1 mark.
Original post by shooby_doo
Does anyone have OCR psychology?


nope, lol
Original post by shooby_doo
Woo yes, full marks for the bond angles! I was stressing over them!
Anyways im curious to know on the question on why to get international awareness on the incineration of plastics?
What did you guys put?

what do u mean? there was no bond angle THING. was there?
Original post by Flint_09
what do u mean? there was no bond angle THING. was there?


well the shape of it ....
i decided to be extra and tell them the bond angles
Original post by shooby_doo
well the shape of it ....
i decided to be extra and tell them the bond angles


ah okay.. u r one step ahead of everyone else
Reply 1119
Avatar for Peanut
Peanut
Original post by shooby_doo
well the shape of it ....
i decided to be extra and tell them the bond angles


i used the bond angles to help explain teh shape

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