2.5 - Transition Metals 1

Question 1

Colour of [CuCl₄]²⁻?

Answer 1

Yellow

Question 2

Colour of [Co(NH₃)₆]²⁺?

Answer 2

Yellow

Question 3

Colour change: Cobalt(II) salt & excess ammonia?

Answer 3

Pink |> Yellow

Question 4

Colour change: [Co(H₂O)₆]²⁺ |> [Co(NH₃)₆]²⁺

Answer 4

Pink |> Yellow

Question 5

Equation for ΔE?

Answer 5

ΔE = hν

h = 6.63x10⁻³⁴ J
ν = frequency of light absorbed
ν = c/λ =3x10⁸/wavelength

Question 6

Colour of [Co(H₂O)₆]²⁺?

Answer 6

Pink

Question 7

What 3 factors affect the Colour of transition metal complexes?

Answer 7

Change in Co-ordination n⁰.
Change in Ligand
Change in Oxidation State

Question 8

Colour of [CoCl₄]²⁻?

Answer 8

Blue

Question 9

Colour of [Cu(H₂O)₆]²⁺?

Answer 9

Pale Blue

Question 10

Colour change: aqueous Cobalt(II) salt & conc. HCl?

Answer 10

Pink |> Blue

Question 11

Colour change: [Co(H₂O)₆]²⁺ |> [CoCl₄]²⁻?

Answer 11

Pink |> Blue

Question 12

Co-ordination n⁰. of Iron(II) in Haem?

Answer 12

4

Question 13

Define: Ligand

Answer 13

a Molecule or ion that forms a Co-ordinate bond with a transition metal by Donating a pair of electrons

Question 14

Colour change: aqueous Copper(II) salt & conc. HCl?

Answer 14

Pale Blue |> Yellow

Question 15

Colour change: [Cu(H₂O)₆]²⁺ |> [CuCl₄]²⁻?

Answer 15

Pale Blue |> Yellow

Question 16

Complexes w/ co-ordination n⁰. of 4 that have ____ as central metal ion are generally ____?

Answer 16

Ni, Pt, or Pd

Square Planar

Question 17

Examples of Bidentate Ligands?

Answer 17

1,2-diaminoethane
Ethanedioate ion (C₂O₄²⁻)

Question 18

Octahedral complexes w/ ____ can form ____ stereoisomers?

Answer 18

Four of one Ligand & Two of another

Cis-Trans

Question 19

Colour of [Cu(H₂O)₂(NH₃)₄]²⁺?

Answer 19

Deep Blue

Question 20

Colour change: aqueous Copper(II) salt & excess ammonia

Answer 20

Pale Blue |> Deep Blue

Question 21

Colour change: [Cu(H₂O)₆]²⁺ |> [Cu(H₂O)₂(NH₃)₄]²⁺?

Answer 21

Pale Blue |> Deep Blue

Question 22

Define: Optical Isomers

Answer 22

Non-superimposable mirror images

Question 23

Octahedral complexes containing ____ can form ____ stereoisomers & ____?

Answer 23

Two bidentate & Two monodentate Ligands
Cis-Trans
Optical isomers of the Cis isomer

Question 24

Colour of [Co(H₂O)₆]²⁺?

Answer 24

Pink

Question 25

Define: Chelate Effect

Answer 25

Ability of Bidentate & multidentate ligands to replace monodentate ligands to form more stable complexes