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October 09, 2026, 07:40:20 pm

Author Topic: How did you all go in the Chem Midyear (June 2011)  (Read 8767 times)  Share 

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schnappy

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Re: How did you all go in the Chem Midyear (June 2011)
« Reply #30 on: June 15, 2011, 09:53:00 pm »
Wikipedia:
"Infrared spectroscopy exploits the fact that molecules absorb specific frequencies that are characteristic of their structure. These absorptions are resonant frequencies, i.e. the frequency of the absorbed radiation matches the frequency of the bond or group that vibrates. The energies are determined by the shape of the molecular potential energy surfaces, the masses of the atoms, and the associated vibronic coupling."

So atomic mass by the looks of it. I guessed electronegativity on the basis of it sounding right... I really don't understand how IR spec works other than something vibrating because of IR radiation.

jane1234

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Re: How did you all go in the Chem Midyear (June 2011)
« Reply #31 on: June 15, 2011, 09:59:09 pm »
Hey if you put NaOH without the (aq) do you think they would still give the mark?

ulbasour

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Re: How did you all go in the Chem Midyear (June 2011)
« Reply #32 on: June 15, 2011, 11:04:00 pm »
Hey if you put NaOH without the (aq) do you think they would still give the mark?
Yes they should

Widdy

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Re: How did you all go in the Chem Midyear (June 2011)
« Reply #33 on: June 21, 2011, 08:27:10 pm »
I'll be happy if I got C+, B is impossible for me :(