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i think the negative sign for the change in energy (ie delta E) mean that the atom has lost some energy and becomes more stable??????....i am not sure if this is right....that's what i learn from chemistry...when calculating value for frequency i think you simply take the absolute value of the...

well i have the chemistry book by zumdahl instead of the silberberg one, and i use that to study by myself.....well thx anyway for those who answered...... ohoh by the way...this is not related to the olympiad but about my school chemistry thing......what should you do if like for an...

Hi everyone, I am thinking of doing the chemistry national qualifying exam this year( i am in year 11, so this is the last year i can do it)...i have looked at the past papers and it is marked out of 120.....does anyone know roughly what mark / 120 would you need to get a HD....and also what...