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Flashcards in transition metals Deck (58)
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1

define transition element

an element which forms at least one stable ion with a partially full d- shell of electrons

2

characteristic physical properties

metallic
good conductors
hard
strong
shiny
high mp/bp
low reactivity

3

uses of iron

vehicle bodies
reinforce concrete

4

uses of titanium

jet engine parts

5

uses of copper

water pipes

6

characteristic chemical properties

variable oxidation states
coloured compounds in solution
good catalyst
form complex ions

7

complex ion

central transition metal ion surrounded by ligands that are coordinated bonded to it

8

catalysts in processes

iron - haber
vanadium oxide - contact
MnO2 - decomposition of H2O2

9

which electrons do transition metals lose first when forming ions

4s

10

define ligand

an ion or molecule with at least one lone pair of electrons, that donates them to a transition metal ion to form a coordinate bond and thus a complex ion

11

monodentate ligands

cl-
H2O
NH3
Cn-

12

ethanedioate

.. ..
O - O -
\ /
C -C
/ / \\
O O

13

ethane-1,2-diamine

:NH2 - CH2 - CH2 - :NH2

14

how many coordinate bonds does EDTA4- form

six

15

define coordination number

the number of coordinate bonds the metal ion has formed to surround the ligand

16

chelate effect

chelate complexes with multidentate ligands are favoured over monodentate ligands or ligands that form fewer coordinate bonds per molecule

17

chelate effect in terms of entropy

number of molecules increases when multidentate ligands , displace ligands that form fewer coordinate bonds per molecule
more stable complex ion formed

18

transition metal in water

Aqua ion, 6H2O ligands
octahedral

19

transition metal with two ligands

linear

20

transition metal with four ligands

tetrahedral

21

platin

square planar

22

conditions needed for a complex ion to display optical isomerism

octahedral with two or more bidentate ligands

23

haem

a molecule which makes up protein chains, with an Fe2+ central metal ion
coordination number = 6
4 of which bonds to porphyrin, 1 to nitrogen of a globin protein, 1 to oxygen

24

haemoglobin transport oxygen

O2 forms weak coordinate bond to the metal ion which is transported around the body. the bond breaks when haemoglobin reaches cells

25

why is CO toxic

coordinately bonds to FE2+ and is a better ligand so bonds more strongly than O2
stops O2 from bonding so it can not be transported around the body

26

why are transition metal compounds coloured

partially filled d orbitals
in compounds with ligands the d orbital splits into different energy levels
energy gap
see reflected light

27

delta E

\
hf= hc/ /\

28

how is delta E changed

oxidation state of metal
number/type of ligands
shape
coordination number

29

VO2^+
VO^2 +
V^3+
V^2+

5+ yellow
4+ blue
3+ green
2+ violet

30

what reduces vanadium

zinc