Transition Metals Flashcards
What makes a transtition metal a transition metal?
It has an incomplete d subshell
why is zinc not a transition metal?
It has a complete d subshell.
What is a complex?
A central metal surrounded by ligands.
What is a ligand?
A species which can donate a lone electron pair
what is the type of bond formed between the metal ion and the ligand?
Dative covalent
What is coordination number?
Number of bonds to central metal ion
what does monodentate mean?
Can form one coordinate bond per ligand
What to look for when doing a substitution reaction?
number of ligands
coordination number of each ligand
what is the size of each ligand
what is the charge of each each ligand
dont forget your extra product/s
why do chloride ions only form 4 bonds?
When substituting chloride ions they will only form 4 coordinate bonds because they are large ions.
What is the charge of EDTA?
4-
Why does substituting a monodentate with a bidentate ligand make it more stable?
Positive entropy change as there are more molecules of products than reactants
What is the use of EDTA?
To remove heavy metal ions from water and in shampoos to remove calcium.
What three things arise colour change?
oxidation number
coordination number
ligand
What three things arise colour change?
oxidation number
coordination number
ligand
What are the ions of scandium colour?
no colour
Determining the concentration of a complex ion?
add ligand to intensify colour
make up solutions of known concentrations
measure absorbtion with spectrometer
plot graph
interpolate with unknown substance
What happens to the relative stability of the +2 and +3 transition metal ions as you progress along the period?
The relative stability of +2 increases across the period with respect to the +3 state.
what do transition metals with high and low oxidation states tend to be?
High is oxidising agent and low is reducing agent?
What acid do you use for manganate titrations?
Only sulphuric
Why would using an insufficient amount of sulphuric acid produce an inaccurate reading of the volume of manganate being used?
Brown MnO2 will form which masks the colour change.
Why would using an insufficient amount of sulphuric acid produce an inaccurate reading of the volume of manganate being used?
Brown MnO2 will form which masks the colour change.
What is the catalyst being used in the manufacturing of methanol from carbon monoxide and water?
Cr2O3
