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it all started off with the montreal protocol etc followed by london amendments then copenhagen amendments then montreal amendments then beijing amendments theres a brazil in there somewhere i thing..someone verfiy.. and correct my order.. no need to elaborate on the actual...

is x-ray diffraction the exact same thing as x-ray crystallography... ie.the work the braggs did

what is the difference between... IUPAC, systematic, structual, molecular and extended structural..formula?? say for PVC.. IUPAC - 1-chloro-ethene systematic - chloroethene structural - the picture molecular - C2H3Cl extended structural - ?? no idea someone verify me

for heisenberg's work...so we just have to know about his uncertainty principle and nothing else?

when rounding off..specifically for pH values and concentration of H3O+, do we stick with what conquering chem says.. ie.. decimal places of pH will equate to the number of sig.figs in the conc. ?? is this what bos wants/

when re-telling your experiment about rates of corrosion...when measuing, we normally go weigh it before n after etc...but what is it that we are weighing..what is the supposed mass lost? Fe(s) -> Fe2+ + 2e- everything should still be in that test tube??

qutoe from a book "an a.c. motor continuously produces a back-emf and so limits itself without the need for a series transistor" meaning a dc motor would need one but then for both ac and dc motors, the current enters the coil as AC (in ac its just via slip rings and for dc its via split ring...

for q22b... as you reduce the mag field..isnt that like pulling a north pole away from the bottom (ie. theres a north pole on hte other side of that loop and your pullin it away) so that means by Mr. Lenz that a south pole will be induced on the under-side of hte loop..so that means if you look...

what is the approx state average for 4u marks??

what is the distinct difference between validity and reliability? is it that validity refers to the experiment being appropriate and reliability being that of being able to repeat the experiment and obtain the same results someone help expand my definitions they're quite...narrow...