properties Flashcards
why do transition elements have variable oxidation states
the energy levels of the 4s and 3d subshell are very close to eachother so different numbers of electrons can be lost using fairly similar amounts of energy
why are transition elements good catalysts
they can change oxidation states quickly by gaining or losing electrons within their 3d subshell so they can transfer electrons to speed up reactions
how do transition elements lower the activation energy of reactions
they can adsorb onto surfaces
what does CuSO4 catalyse
catalyses reaction of zinc with acids
what does iron catalyse
the haber process
why are catalysts good for industry
they allow reactions to happen faster at lower temperatures and pressures to reduce energy usage
what is a limitation of using transition elements as catalysts
propose many health risks, for example, long term exposure to copper can cause liver and kidney damage
what can transition elements form
colored ions
what colour is [Cu(H2O)6]2+
pale blue solution
write the precipitation reaction for Cu(II) with NaOH (aq)
Cu2+(aq) + 2OH- (aq) ->
Cu(OH)2 (s)
what colour is Cu(OH)2
pale blue precipitate
