chemistry

define transition element
elements with partially filled d orbitals
1 of 15
how many electrons do Cu an Cr have in their 4s orbitals
1
2 of 15
in general what fills first 4s or 3d and what is lost first?
4s, 4s
3 of 15
define complex
ligands joined to a transition metal by coordinate bonds
4 of 15
define ligand
small molecule with a lone pair that can bond to a transition metal ion
5 of 15
how does colour arise in transition metal complexes
when a complex forms the d orbitals are split into 2 higher energy and 2 lower energy orbitals. electrons absorb visible energy to jump from the lower to the higher energy level. the colour seen is the frequencies not absorbed
6 of 15
cr3+ what happens when naoh is added
dark green ppt- goes back to green solution in excess
7 of 15
fe2+ what happens when naoh is added
dark green ppt- nfr
8 of 15
fe3+ what happens when naoh is added
red brown ppt-nfr
9 of 15
cu2+ what happens when naoh is added
pale blue ppt- nfr
10 of 15
give 4 metal catalysts and their uses
iron- harber process in production of ammonia nickel-hydrogenation of vegetable oils vandium(v) oxide- contact process for production of sulphuric acid manganese(iv) oxide- catalytic decomposition of h202
11 of 15
define catalyst
increase ror by providing an alternative pathway for a lower activation energy
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why are transition metals good catalysts
1 can adsorb 2 variable oxidation states 3 partially filled d orbitals
13 of 15
Why are Cu+ compounds colourless
full d orbitals
14 of 15
describe the bonding in copper(11) complexes
complexes consist of a cu2+ ion surrounded by small molecules with lone pairs called ligands that form coordinate bonds with it
15 of 15

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Card 2

Front

how many electrons do Cu an Cr have in their 4s orbitals

Back

1

Card 3

Front

in general what fills first 4s or 3d and what is lost first?

Back

Preview of the front of card 3

Card 4

Front

define complex

Back

Preview of the front of card 4

Card 5

Front

define ligand

Back

Preview of the front of card 5
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