Light And Transition Metals

Question 1

When electrons are excited what do they move from?
What gives d orbitals in compounds slightly different energy levels?
When electrons move from d orbitals what do they absorb?
What do we then see?

Answer 1

One d orbital to another
Presence of other atoms
Visible region of energy equal to difference in energy
Colours not absorbed

Question 2

What two states are there?

Answer 2

Ground and excited

Question 3

Ultra violet and visible spectrophotometry
What can colour shown by solution be used to determine?
What do we use?
What is passed through sample?
What is emerging lift received by?
What is the light absorbed proportional to?
What is then plotted?

Answer 3

Concentration of ion 
Photometer or calorimeter 
Frequency of light increasing or decreasing 
By detector and recorded 
Conc of species 
Graph

Question 4

Why can some solutions not be determined accurately?

What can adding a ligand do?

Answer 4

Difference in absorption not great enough

Increase by a factor of 1000

Question 5

How do you find out formula transition metal complex?

Answer 5

Two solutions one of ligand one of metal ion
Add different proportions making up same volume
There is max conc of complex ion
After this extra addition will not affect absorption

Question 6

Potassium thiocyanate added to Fe3+
Equation
What happens?

Answer 6

[Fe(H2O)6]3+ + SCN- > [Fe(SCN)(H2O)5]2++H2O

Water replaced by SCN

Question 7

What does eye detect?

If something appears purple what colours aren’t absorbed?

Answer 7

Part of visible spectrum not absorbed

Red and blue