Post your results here!

[thushan]

Really? Damn. Hmm. I heard from my teacher (an assessor) that jackson's teacher (Chief Examiner) said that "he didn't teach his class that (the IR mass thingy) and he will continue to not teach his class that." Maybe I heard wrong.

Btw - two things that affect wavenumber are mass and bond length. Reason C-C and C=C are different is because one has a shorter bond-length than the other.

Whilst mass is the correct answer, I also stand by "atomic radius" as another possible answer as this is highly linked with bond-length, which could explain the discrepancy between the C-C and O-O bonds (in relation to the data at large, check data book).

Electronegativity may have a slight impact in that the bond may be stronger due to the polarisation and dipole formation, and stronger bonds are shorter.

[paulsterio]

Really? Damn. Hmm. I heard from my teacher (an assessor) that jackson's teacher (Chief Examiner) said that "he didn't teach his class that (the IR mass thingy) and he will continue to not teach his class that." Maybe I heard wrong.

Btw - two things that affect wavenumber are mass and bond length. Reason C-C and C=C are different is because one has a shorter bond-length than the other.

Whilst mass is the correct answer, I also stand by "atomic radius" as another possible answer as this is highly linked with bond-length, which could explain the discrepancy between the C-C and O-O bonds (in relation to the data at large, check data book).

Electronegativity may have a slight impact in that the bond may be stronger due to the polarisation and dipole formation, and stronger bonds are shorter.

good point there

well, it makes sense for it to be scrapped because chemistry has always been a subject about skills and applications, rather than stuff like this, which is rote memorisation, this doesnt require thinking, this requires memorisation of that page of the heinemann text book, and either way, i havent managed to find this information in any other textbook and also, without someone telling you the answer (ie the textbook) you cant exactly derive it =.=

but im not sure, i ordered my statement last week, so it should arrive early (ie this week) that should put an end to this

ill let you guys know

[Tashi]

The dodgy redox one wasn't that bad, i think if you just looked at it for a second, it would have made sense, its not an actual "error"

but im still sticking with that IR MC question, cause no one can seem to explain that if its mass only, then why is C-C and C=C different, arent they the same mass?

i also found some info that states electronegativity and size (ie. radius) also plays a part, ill post it up when i manage to find it, its from the UCLA (so yes its credible)

Its mass of the atoms attached to it?
I was lucky to have it in my notes

[luken93]

I think it would've been fair game if you could actually find the answer, but the fact that there was a discrepancy (despite it saying "best" supports) made it extremely difficult to get the answer.

Ah well, hopefully I get my SoM ASAP and I can stop these rumours from occuring!

[paulsterio]

The dodgy redox one wasn't that bad, i think if you just looked at it for a second, it would have made sense, its not an actual "error"

but im still sticking with that IR MC question, cause no one can seem to explain that if its mass only, then why is C-C and C=C different, arent they the same mass?

i also found some info that states electronegativity and size (ie. radius) also plays a part, ill post it up when i manage to find it, its from the UCLA (so yes its credible)

Its mass of the atoms attached to it?
I was lucky to have it in my notes

ohh (: well congrats on having it in your notes tashi
omg, you make me feel bad that i want this question taken out, cause that would disadvantage people who got the answer
gee thanks

but i still think luken93 points out a good point that there was a discrepency

[jackson1234]

Really? Damn. Hmm. I heard from my teacher (an assessor) that jackson's teacher (Chief Examiner) said that "he didn't teach his class that (the IR mass thingy) and he will continue to not teach his class that." Maybe I heard wrong.

Btw - two things that affect wavenumber are mass and bond length. Reason C-C and C=C are different is because one has a shorter bond-length than the other.

Whilst mass is the correct answer, I also stand by "atomic radius" as another possible answer as this is highly linked with bond-length, which could explain the discrepancy between the C-C and O-O bonds (in relation to the data at large, check data book).

Electronegativity may have a slight impact in that the bond may be stronger due to the polarisation and dipole formation, and stronger bonds are shorter.

yeah thushan dw man, i bet the percentage of people who got that right  was like 1%. to be honest. Ull get 50

[paulsterio]

Really? Damn. Hmm. I heard from my teacher (an assessor) that jackson's teacher (Chief Examiner) said that "he didn't teach his class that (the IR mass thingy) and he will continue to not teach his class that." Maybe I heard wrong.

Btw - two things that affect wavenumber are mass and bond length. Reason C-C and C=C are different is because one has a shorter bond-length than the other.

Whilst mass is the correct answer, I also stand by "atomic radius" as another possible answer as this is highly linked with bond-length, which could explain the discrepancy between the C-C and O-O bonds (in relation to the data at large, check data book).

Electronegativity may have a slight impact in that the bond may be stronger due to the polarisation and dipole formation, and stronger bonds are shorter.

yeah thushan dw man, i bet the percentage of people who got that right  was like 1%. to be honest. Ull get 50

one of my friends was randomly reading the textbook before the exam, and he just happened to read the sentence in the heinemann book that says it was mass, dodgy

[thushan]

Really? Damn. Hmm. I heard from my teacher (an assessor) that jackson's teacher (Chief Examiner) said that "he didn't teach his class that (the IR mass thingy) and he will continue to not teach his class that." Maybe I heard wrong.

Btw - two things that affect wavenumber are mass and bond length. Reason C-C and C=C are different is because one has a shorter bond-length than the other.

Whilst mass is the correct answer, I also stand by "atomic radius" as another possible answer as this is highly linked with bond-length, which could explain the discrepancy between the C-C and O-O bonds (in relation to the data at large, check data book).

Electronegativity may have a slight impact in that the bond may be stronger due to the polarisation and dipole formation, and stronger bonds are shorter.

yeah thushan dw man, i bet the percentage of people who got that right  was like 1%. to be honest. Ull get 50

Wish I could say that, i dropped another careless mark ahahah

[paulsterio]

Wish I could say that, i dropped another careless mark ahahah

well they do say its the careless errors not the knowledge that separates the 48's to 49's to 50's

haha, good luck though, hope you get that 50

[dopplereffect]

A+

[luken93]

Saw the stats today, the IR question and the redox Q were definitely both counted. Unbelievably, 20% got the IR question right - good guess

As for the Ibuprofen though, only 6% got it correct in the state hahahaha

[Tashi]

Saw the stats today, the IR question and the redox Q were definitely both counted. Unbelievably, 20% got the IR question right - good guess

As for the Ibuprofen though, only 6% got it correct in the state hahahaha

Where did you see these stats? And hey, some of us didn't guess lol! I had no idea on the ibuprofen one.

[ApplePie]

Screwed up bad for chem, got a C+, i hope i do better for the end of year... Is it still possible to get 35 SS?

[totaled]

The dodgy redox one wasn't that bad, i think if you just looked at it for a second, it would have made sense, its not an actual "error"

but im still sticking with that IR MC question, cause no one can seem to explain that if its mass only, then why is C-C and C=C different, arent they the same mass?

i also found some info that states electronegativity and size (ie. radius) also plays a part, ill post it up when i manage to find it, its from the UCLA (so yes its credible)

its dependant upon BOTH mass, and bond strength, if you look at your heinemann book

[luken93]

Saw the stats today, the IR question and the redox Q were definitely both counted. Unbelievably, 20% got the IR question right - good guess

As for the Ibuprofen though, only 6% got it correct in the state hahahaha

Where did you see these stats? And hey, some of us didn't guess lol! I had no idea on the ibuprofen one.

Teacher showed me, highly secretive but meh...

The dodgy redox one wasn't that bad, i think if you just looked at it for a second, it would have made sense, its not an actual "error"

but im still sticking with that IR MC question, cause no one can seem to explain that if its mass only, then why is C-C and C=C different, arent they the same mass?

i also found some info that states electronegativity and size (ie. radius) also plays a part, ill post it up when i manage to find it, its from the UCLA (so yes its credible)

its dependant upon BOTH mass, and bond strength, if you look at your heinemann book

It is definitely the mass, end discussion now, nothing you say or do is going to change it unfortunately...