test errata
error on question 21 of Honors Q. Lab test...had two answers too close in nm if ref to the emission line....lots were fooled by correct number but wrong or no unit answer...just as warned and predicted!
AP: forgot to put c H2O in the thermo question but then put it on the board...they could NOT get the KE of ejected electron...they used deBroglie's equation instead of mv2/2...must teach them an explicit example next time instead of just showing einstein's photoelec. graph.
almost ALL got the Bond dissoc. energy question wrong because they don't know how to convert energy on the product side to a negative exothermic delta H...and they keep using frickin HESS when I told them not to...and they don't know what the f delta H of formation is still!
AP: forgot to put c H2O in the thermo question but then put it on the board...they could NOT get the KE of ejected electron...they used deBroglie's equation instead of mv2/2...must teach them an explicit example next time instead of just showing einstein's photoelec. graph.
almost ALL got the Bond dissoc. energy question wrong because they don't know how to convert energy on the product side to a negative exothermic delta H...and they keep using frickin HESS when I told them not to...and they don't know what the f delta H of formation is still!
posted by C at 11/10/2005 10:52:00 PM
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