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

Unfortunately if you draw it correctly but name is wrong you don't get the mark

Just one
dont worry ive lost a dozen...

hey btw i got an offer from qmul for biomed too but my offer is AAB ¬_¬ ??

When working out the empirical formula on the last question i got oxygen to be 1.5, but surely that can't be the empirical formula because it isn't a whole number but i thought it would be unreliable to round it up to 2, did anyone else get this? i left it as 1.5 and at the end got Ethyl propanoate

When working out the empirical formula on the last question i got oxygen to be 1.5, but surely that can't be the empirical formula because it isn't a whole number but i thought it would be unreliable to round it up to 2, did anyone else get this? i left it as 1.5 and at the end got Ethyl propanoate

Can you explain to me how to work out the enthalpy of formation?

My mind went completely blank, and then eventually after 20 minutes of rock solid thinking on trying to remember how to work it out... i just skipped it ... and had no time to come back to it ...

When working out the empirical formula on the last question i got oxygen to be 1.5, but surely that can't be the empirical formula because it isn't a whole number but i thought it would be unreliable to round it up to 2, did anyone else get this? i left it as 1.5 and at the end got Ethyl propanoate

You had to divide 66 by 2 to get 33, because the equation given was the formation of 2 moles of NO and by definition, enthalpy of formation is forming one mole of a compound

I remember seeing somewhere that if you consumed methanol, you could die so when it came up I Put:

Russian mafia agents use it to kill people they don't like!!! heheheheheheh

Source from wiki
Applications for methanol:
"In a soda to be mixed with water to obtain a very low alcohol drink or pure (brand Ricqlès which contains 80% alcohol in France). The alcohol is also used to alleviate nausea, in particular motion sickness, by pouring a few drops on a lump of sugar."

So technically we're right! :P lol

Thanks, some of my friends said that it was wrong to show K, and that you should only show OH in the mechanism.

I thought the paper started off quite confusing but then got better.

My answers roughly - don't get disheartened/pissed off if our answers don't match, there's no guarantee I'm even right.

Respiration formula was standard.
Why is it endothermic Bond breaking is endothermic, bond breaking is exothermic, one outweighs the other, can't remember which one i put, nor do i have the mental capacity to work it out now.
Enthalpy question -2793 or something in that region.
Activation energy minimum energy needed to begin breaking reactant bonds and kick start a reaction.
Why cant you measure formation directly Activation energy is too high.

Dynamic system question - collision theory, more particles in same volume, closer together on average, all that jazz.
Car Exhaust not a closed system
Compare alkanes and alcohols I just waffled on about one has van der waal forces, the other has hydrogen bonds, hydrogen are stronger than vandewaals. And something about boiling points.
Name the monomer But-1-ene?

Ozone mechanism NO + 03 ------> N02 + 02 (1) NO2 + 0 ---------> NO + O2 (2) Overall: O3 + O ------> 2O2


Use for methanol Feedstock (just wrote that, not sure if i'll get a mark for putting just that)
Tertiary Alcohol 2-methylpropan-2-ol
Secondary Butan-2-ol
Why one dissolves in water Polar OH- group forms hydrogen bonds.
Complete combustion of methanol CH3OH + 1.5O2 -------> CO2 + 2H20
Incomplete CH3OH + O2 ------> CO + 2H20

Cracking Process 5 i think i put?
Isomer product Process 1?
One of the answers F
The other one ahah D&E

Drawing it First drawing just took the double bond out, next two, drew the methyl group, but then had the bromine next to the methyl group on one picture, then at the other point for the other.

Shapes Tetrahedral and then trigonal i think?

Mechanism was nucleophilic substitution, heterolytic, bromoalkane hydrolyzed faster because it was longer, weaker bond enthalpy and more reactive.

Ester Ethyl Propanoate and all that analysis ****.

All the green chemistry i just waffled **** loads - CO is poisonous/carcinogenic (i think that's a lie) contributes to acid rain? HCL (acid rain, ground level ozone?) And more stuff - which is probably all lies also.

Atom economy I thought was better - less waste, more sustainable

International treaty I invoked gandi and martin luther king as i began preaching about saving the world by reducing polymers.

That is all i can actually remember - hope any of that helps.
It's my third time doing it (got 118/150 both times) Keep resitting, your chemistry ability will continually get better.

Wish all of you luckk.