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if youve got a photocell? i think thats the one, - thermionic device, ? theres a circuit with a vacuum tube, and a potential difference applied across it, when photons hit the photo sensitive electrode, electrons are emitted, and travel across the vacuum, but the electric field opposes their...

i know how to calculate the pH of HCl etc, but sulfuric acid is diprotic.... cant rememeber exactly what happens, but, after the first ionisation, isnt hso4- an extremely weak base.... conjugate base thing? or does that second H ionise too, to make a nice happy situation.

I know that the syllabus is the blueprint for the questions for the HSC - has to be in syllabus to be asked right? Our teacher taught us something just for trivia, and suggested that we learn it. The next week we had a revision assignment and this was in it, since he has also tested us in...