Transition Metals

Question 0

What is the definition of a ligand?

Answer 0

Ligand donates lone pair of electrons to the d-orbital of transitional metal ion to form a coordinate bond.

Question 1

What are the 4 main properties of a transition element?

Answer 1

1. Acts as catalysts
2. Can be in variable oxidation states.
3. forms variable coloured compounds.
4. Forms complex ions

Question 2

What’s the definition of a transition element?

Answer 2

d-block elements that form an ion with an incomplete d-sub shell.
Ti-Cu

Question 3

What is the definition of a complex ion?

Answer 3

It is a central transition metal ion surrounded by ligands bonded to it by dative covalent bond.

Question 4

What is the coordination number of a complex ion?

Answer 4

The number of dative covalent bonds between ligand and central transitional metal ion.

Question 5

What colour precipitate does Cu(OH)2 have?

Answer 5

Blue precipitate

Question 6

What colour solution does (CuCl4)2- have?

Answer 6

Yellow solution

Question 7

What is the definition of a bidentate ligand?

Answer 7

Ligand that donates 2 lone pair of electrons to a metal ion, forming 2 coordinate bonds.

Question 8

Explain how ligand substitutions allow haemoglobin to transport oxygen in the blood.

Answer 8

• Oxygen donates lone pair of electrons to Fe2+

- when required O2 is substituted.

Question 9

In the presence of Carbon Monoxide, less oxygen is transported in the blood. In terms of stability constants, suggest why.

Answer 9

For complex with CO, stability constant is greater than complex with O2.
Coordinate bond with CO is stronger than O2 and CO binds irreversibly.

Question 10

Describe the action of platin in the treatment of cancer patients.

Answer 10

Platin binds to DNA of cancer cells.

Platin binds to cancer cells replicating.