Transition metals

Question 1

What is a transition metal?

Answer 1

A transition metal is a metal that can form one or more stable ions with a partially filled subshell.

Question 2

What are the physical properties of transition metals?

Answer 2

-High density
-High melting and boiling points

Question 3

What are the chemical properties of transition metals?

Answer 3

-Form complex ion
-Form coloured ions
Good catalyst
-Variable oxidation states

Question 4

What is the colour of aqueous Fe3+?
With NaOH, excess NaOH, NH3, excess NH3 and Na2CO3.

Answer 4

Purple but the solution may look yellow-brown. [Fe(H2O)6]3+

NaOH- Brown ppt
Excess NaOh- No further change
NH3- Brown ppt
Excess NH3- No further change
NaCO3- Brown ppt- may look orange/brown

Fe(H20)3(OH)3

Question 5

What is the colour of Fe2+?
With NaOH, excess NaOH, NH3, excess NH3 and Na2CO3.

Answer 5

Green solution. [Fe(H2O)6]2+

NaOH-Green ppt goes brown on standing in air
Excess NaOH- No further change
NH3- Green ppt goes brown on standing in air
Excess NH3- No further change.
Fe(H2O)4(OH)2

NaCO3- Green ppt
FeCO3

Question 6

What is the colour of Cu2+?
With NaOH, excess NaOH, NH3, excess NH3 and Na2CO3.

Answer 6

Blue solution. [Cu(H2O)6]2+

NaOH- Blue ppt
Excess NaOH- No further change
NH3- Blue ppt
Cu(H20)4(OH)2

Excess of NH3- Deep blue solution
[Cu(H2O)2(NH3)4]2+

Na2CO3- Blue-green ppt
CuCO3

Question 7

What is the colour of Al3+?
With NaOH, excess NaOH, NH3, excess NH3 and Na2CO3.

Answer 7

Colourless solution

NaOH- White ppt
NH3- White ppt
NaCO3- White ppt
Al(H2O)3(OH)3

Excess NaOH- Colourless solution
[Al(OH)4]-

Excess NH3- No further change

Question 8

What is the colour of Vanadium 2+?

Answer 8

Purple

Question 9

What is the colour of vanadium 3+?

Answer 9

Green

Question 10

What is the colour of VO2+?

Answer 10

Blue

Question 11

What is the colour of VO2 +?

Answer 11

Yellow